Difference between revisions of "OpenFOAM/C3/Turbulent-Flow-in-a-Lid-driven-Cavity/English"

From Script | Spoken-Tutorial
Jump to: navigation, search
 
(18 intermediate revisions by 2 users not shown)
Line 18: Line 18:
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 1:  
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 1:  
 
 
  
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Hello and welcome to the spoken tutorial on modelling '''Turbulent flow in a Lid Driven Cavity using OpenFOAM'''
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Hello and welcome to the spoken tutorial on modelling '''Turbulent flow in a Lid Driven Cavity using OpenFOAM'''
 
 
 
  
 
|-
 
|-
Line 33: Line 28:
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this tutorial I will show you  
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this tutorial I will show you  
  
 
+
* Solving '''turbulent case''' in '''OpenFOAM''' and
Solving '''turbulent flow''' case in '''OpenFOAM'''
+
* Plotting '''streamlines''' in '''ParaView'''
 
+
 
+
Plotting '''streamlines''' in '''Paraview'''
+
 
+
 
+
 
+
  
 
|-
 
|-
Line 47: Line 36:
  
 
System Requirement
 
System Requirement
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To record this tutorial I am using '''Linux operating system''' '''Ubuntu 12.04'''
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To record this tutorial I am using  
 
+
* '''Linux operating system''' '''Ubuntu version 12.04'''
 
+
* '''OpenFoam version 2.1.1''' and
'''OpenFoam version 2.1.1'''
+
* '''ParaView version 3.12.0'''
 
+
 
+
'''Paraview version 3.12.0'''
+
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide:
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 4:
  
 
System Requirement
 
System Requirement
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The tutorials were recorded using the versions specified in previous slide  
+
* The tutorials were recorded using the versions specified in previous slide  
  
Subsequently the tutorials were edited to latest versions
+
* Subsequently the tutorials were edited to latest versions
 
+
To install latest system requirements go to Installation Sheet
+
  
 +
* To install latest system requirements go to Installation Sheet
  
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 4 :
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 5 :
  
  
Line 74: Line 60:
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To practice this tutorial you should have some basic knowledge of
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To practice this tutorial you should have some basic knowledge of
  
 
+
* '''Turbulence modelling'''
'''Turbulence modelling'''
+
* Knowledge of how to solve '''flow''' in a '''Lid driven cavity'''
 
+
* If not so please refer to the relevant tutorial on our website
 
+
Knowledge of how to solve flow in a '''Lid driven cavity'''
+
 
+
 
+
If not so please refer to the revelent '''tutorial''' on our website
+
 
+
 
+
 
+
  
 
|-
 
|-
Line 93: Line 71:
  
  
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| This problem is identical in '''geometry and boundary'''
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| This problem is identical in '''geometry and boundary condition''' to the ''''Lid Driven Cavity'''' problem discussed in the basic level tutorial
 
+
 
+
'''conditions''' to the ''''Lid Driven Cavity'''' problem discussed in the  
+
 
+
 
+
basic level tutorial.
+
 
+
 
+
Please make a note this '''problem''' is already set up in
+
  
  
'''pisoFoam solver''' in OpenFoam directory.
+
Please make a note this problem is already set up in '''pisoFoam solver''' in '''OpenFoam''' directory
  
  
The '''boundary conditions''' are Lid velocity , '''U =1m/s'''
+
The '''boundary conditions''' are the '''Lid velocity U is 1 m/s'''
  
  
And we are solving this for a '''Reynolds number''' '''Re =10000'''
+
And we are solving this for a '''Reynolds number Re equal to 10000'''
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 5: Solver  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 6: Solver  
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| We will be using the '''Transient''' '''solver''' for '''incompressible''',
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| We are using a '''Transient solver''' for '''incompressible turbulent flow of Newtonian fluids''' called as '''pisoFoam'''
 
+
 
+
'''turbulent flow of Newtonian fluids'''.
+
 
+
 
+
It is called '''pisoFoam'''
+
 
+
 
+
 
+
  
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Steps in setting up the problem
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Steps in setting up the problem
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now let me open the '''terminal window'''
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now let us open the '''Terminal''' window by pressing '''Ctrl+Atl+T''' keys together 
 
+
 
+
To do this press '''Ctrl+Atl+t keys''' simultaneously on your '''keyboard'''.
+
 
+
 
+
 
+
  
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| In the terminal window  
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| In the terminal window  
  
 +
Type cd tutorials
  
Go to the pisoFoam folder
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''terminal''' window type '''run''' and press '''Enter'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the terminal window '''type run''' and press enter
+
  
  
Now type '''cd tutorials''' and press enter
+
Now type '''cd space tutorials''' and press '''Enter'''
  
 +
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type cd incompressible
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type '''cd space incompressible''' and press '''Enter'''
  
type '''cd incompressible''' and press enter
+
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type cd pisoFoam
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type '''cd space pisoFoam''' (Note that '''F''' here is capital ) and press '''Enter'''
  
 +
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type ls
  
type '''cd pisoFoam''' (Note that F here is capital ) and press enter
 
  
|-
+
Two Folders les and ras
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Two Folders les and ras
+
  
  
 
Cavity folder inside RAS
 
Cavity folder inside RAS
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type''' ls''' and press enter
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type''' ls''' and press '''Enter'''
  
  
In this you will see two folders '''les and ras'''
+
In this you will see two folders '''les''' and '''ras'''
  
  
Our problem is setup inside '''ras''' folder which is called as '''reynolds averaged stress'''  
+
Our problem setup is inside '''ras''' folder which is called as '''reynolds averaged stress'''
  
 +
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type cd ras
  
  
 +
ls
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Our folder name is '''cavity'''
  
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Cavity folder
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Our folder name is '''cavity'''.
 
  
 +
Now type '''cd space ras''' and press '''Enter'''
  
Now type '''cd ras''' and press enter
 
  
 +
Now type''' ls''' and press '''Enter'''
  
Now type''' ls''' and press enter
+
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type cd cavity
  
 +
ls
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can see the '''cavity''' folder. Let me clear this off
  
You can see the '''cavity''' folder
 
  
 +
Now type '''cd space cavity''' and press '''Enter'''
  
type '''cd cavity''' and press enter
 
  
 
+
Now type''' ls''' and press '''Enter'''
Now type''' ls''' and press enter
+
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Boundary and Initial conditions
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Point to the 3 folders
 +
 
 +
Boundary and Initial conditions
  
  
 
0 folder
 
0 folder
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this you will see three folders''' 0,constant and system'''.
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can see three folders ''' 0, constant''' and '''system'''
  
  
The '''initial conditions''' are specified within the files in the ''''0'''' directory.
+
The '''initial conditions''' are specified within the files in the ''''0'''' directory
  
  
Let us take a look at the files in the ''''0'''' directory.
+
Now let us take a look at the files in the ''''0'''' directory  
  
 
|-
 
|-
Line 204: Line 168:
  
  
ls to view the files inside this folder
+
Type ls
  
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To do this, in the '''command terminal''' type '''cd space 0''' and press '''Enter'''
  
Do not edit the files unitil inlet parameters don't change
 
  
 +
Now type '''ls''' and press '''Enter'''
 +
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|Point to the files as per narration
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can see the files named as '''epsilon, k, nut, nutilda, p, R''' and '''U'''
  
Refer to the earlier tutorial on channel flow for calculating these values
 
 
 
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Type the following command
 
 
'''cd 0''' and press enter
 
 
 
Now type '''ls''' and press enter
 
 
 
You can see files named as '''epsilon, k, nut, nutilda,p,R and U'''.
 
 
 
These files are to be kept as default until the '''inlet''' parameters don't change.
 
 
 
If any changes are to be done please refer to the tutorial
 
 
 
On '''Simulating flow in a channel''' using OpenFoam
 
 
 
to calculate these values.
 
  
 +
These files are to be kept as default until the '''inlet parameters''' don't change
  
  
 +
If any changes are to be done please refer to the tutorial on '''Simulating flow in a channel''' using OpenFoam, to calculate these values
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Let us view the constant folder
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type cd..
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type '''cd ..''' and press enter
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type '''cd space dot dot''' and press '''Enter'''
  
  
 
Let me clear this off
 
Let me clear this off
  
 +
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type cd constant
  
Let us open the '''constant''' folder.
+
Type ls
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Let us open the '''constant''' folder
  
  
To do this type '''cd constant''' and press enter
+
To do this type '''cd space constant''' and press '''Enter'''
  
  
Now type '''ls''' and press enter
+
Now type '''ls''' and press '''Enter'''
  
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| PolyMesh folder and fluid property files
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| PolyMesh folder and fluid property files
  
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this you will see the '''polyMesh''' folder containing
 +
*the geometry of the '''case''' inside '''blockMeshDict'''
 +
*and the '''fluid properties'''
  
 
+
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this you will see the '''polyMesh''' folder containing the geometry
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Point to the two files as per narration
 
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this '''case''' you will see two more files other than '''transportProperties''' named as '''RASProperties''' and''' turbulenceProperties'''
 
+
of the case inside '''blockMeshDict'''
+
 
+
 
+
And the '''fluid properties'''.
+
 
+
 
+
In this case you will see two more files  
+
 
+
 
+
other than '''transportProperties''' named as  
+
 
+
 
+
'''RASProperties''' and''' turbulenceProperties'''
+
  
  
Line 282: Line 219:
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| RASProperties
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| RASProperties
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the terminal type''' gedit (space) RASProperties''' and press enter.
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''terminal''' type''' gedit (space) RASProperties''' and press '''Enter'''
  
  
Let me drag this to the capture area
+
Scroll down
  
  
Scroll Down
+
'''RASProperties''' contain the '''Reynolds average stress model''' for this case, which is kept as '''kEpsilon'''
  
  
'''RASProperties''' contain the '''Reynolds average stress model''' for this case.
+
Close this
 
+
 
+
Which is kept as '''kepsilon'''
+
 
+
 
+
close this
+
  
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| turbulentProperties
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| turbulentProperties
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now in the command terminal now type
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now in the '''command terminal''', type '''gedit space turbulentproperties''' and press '''Enter'''
  
  
'''gedit (space) turbulentproperties''' and press enter
+
Scroll down
  
  
'''turbulentProperties''' contain the '''turbulent model''' ,
+
'''The simulation type model''' for this '''case''' is kept as '''RASModel'''
 
+
 
+
'''Simulation type model''' for this case is kept as '''RASModel'''
+
  
  
Line 320: Line 248:
  
 
Change the value of viscosity
 
Change the value of viscosity
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now let us open the '''transportProperties''' file
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now let us open the '''transportProperties model'''
  
  
In the terminal window type '''transportProperties '''and press enter.
+
To do this, in the '''terminal''' type '''gedit space transportProperties '''and press '''Enter'''
  
  
The '''transportModel '''we are using here is '''Newtonian '''and
+
The '''transportModel '''we are using here is '''Newtonian '''and the '''Viscosity''' is kept as '''1 e raise to -4'''
  
  
Viscosity is kept as '''1 e raise to -4'''
+
Close this
 
+
 
+
close this  
+
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Do ot change the blockMeshDict file
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Do not change the blockMeshDict file
  
  
 
The system folder is to be kept default
 
The system folder is to be kept default
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| We are not changing the geometry in this case
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| We are not changing the '''geometry''' in this '''case'''
  
  
So we need not go inside the '''polyMesh '''folder
+
So we need not go inside the '''polyMesh '''folder and look at the '''blockMeshDict''' file
 
+
 
+
and look at the '''blockMeshDict''' file
+
  
  
 
It can be kept as it is
 
It can be kept as it is
  
 
+
|-
In the terminal type '''cd ..''' and press enter
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type cd..
 
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''terminal''' type '''cd space dot dot''' and press '''Enter'''
 
+
We will keep the '''system''' folder default
+
  
  
As there are no changes inside it
+
We will keep the '''system''' folder default as there are no changes inside it
  
 
|-
 
|-
Line 367: Line 287:
  
 
Meshing is done
 
Meshing is done
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| We are done with the setup
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now, we are done with the setup
  
  
Now we can '''mesh''' the geometry
+
We can '''mesh''' the '''geometry'''
  
  
To do this in the teminal window '''type blockMesh''' and press Enter
+
To do this in the '''terminal''' window '''type blockMesh''' and press '''Enter'''
  
  
Line 380: Line 300:
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Running the solver : pisoFoam
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Running the solver : pisoFoam
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now we can run the '''solver'''
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now we can '''run''' the '''solver'''
  
  
To do this in the terminal type '''pisoFoam''' and press enter
+
To do this in the '''terminal''' type '''pisoFoam''' and press '''Enter'''
  
 +
The '''iterations''' running can be seen in the '''terminal''' window
  
the '''iterations''' running can be seen in the terminal window.
 
  
 
+
It may take some time for the '''iterations''' to stop
It may take some time till the '''iterations''' stop.
+
  
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Post-processing the results in paraview
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Post-processing the results in paraview
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''Iterations''' will stop at the end of the time step.
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The '''iterations''' running will stop at the end of the '''time step'''
  
  
To visualize the results let us open the '''paraview''' window.
+
To visualize the results let us open the '''ParaView''' window
  
  
To do this in the terminal '''type paraFoam''' and press enter.
+
To do this in the '''terminal''' type '''paraFoam''' and press '''Enter'''
  
  
This will open the '''paraview''' window
+
This will open the '''ParaView''' window
  
 
|-
 
|-
Line 415: Line 334:
  
  
You can see the '''lid driven cavity''' geometry.
+
You can see the '''lid driven cavity geometry'''
  
  
A common visualisation is '''surface plots'''.
+
A common visualization is '''surface plots'''
  
  
Change the display to '''Surface''' in the column and
+
Change the display to '''Surface''' in the column.
  
 +
And from the drop down menu change from '''solid colour''' to  capital '''U'''
  
from the drop down menu change from '''solid color to U'''
 
  
 
+
You can see the '''initial condition''' of '''velocity'''
You can see the initial condition of velocity
+
  
 
|-
 
|-
Line 434: Line 352:
  
 
Toggle on the color legend  
 
Toggle on the color legend  
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now on top of the paraview window you can see the '''VCR control'''
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now on the top of the '''ParaView''' window you can see the '''VCR control'''
  
  
Click the '''play''' button  
+
Click on the '''Play''' button
  
  
You can see the motion of the fluid inside the '''cavity'''.
+
You can see the motion of the fluid inside the '''cavity'''
  
  
You can also '''toggle on''' the '''color legend''' on the left hand side top  
+
You can also '''toggle''' on the '''colour legend''' from the left hand side top of '''ParaView active variable control menu'''
  
  
of '''paraview''' '''active variable control menu'''.
+
Click on it. You can see the colour '''legend'''
 
+
 
+
Click on it
+
  
 
|-
 
|-
Line 459: Line 374:
  
  
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To visualise the '''stream lines'''
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now to visualise the '''stream lines'''
  
 +
*On top of the menu bar of '''ParaView'''
 +
*Go to '''Filters > Common and  Stream Tracer'''
 +
*Click on it
  
On the top menu bar of '''paraview'''
+
|-
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Streamlines on top
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| On the left hand side of the '''Object inspector menu''' you can see '''Apply'''.  Click on it
  
  
Go to '''Filters > Common > Stream Tracer'''s
+
You can see the '''stream lines''' at the centre of the '''lid driven cavity'''
 
+
 
+
Click on it
+
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Streamlines on top of the
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Streamlines view
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| On the left hand side of the '''Object inspector menu''' click on '''Apply'''.
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can also change the '''orientation''' in which the '''stream lines''' are viewed
  
  
You can see the '''stream lines''' at the center of the lid driven cavity.
+
To do this , scroll down
 
+
 
+
You can also change the '''orientation''' in which the stream lines are viewed.
+
 
+
 
+
To do this , scroll down  
+
  
  
 
You can see the''' seed type'''
 
You can see the''' seed type'''
  
 
+
|-
Let me shift this to the right
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Shift to right >> change point source to line source
 
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Let me shift this to the right and change from''' point source''' to '''line source'''
 
+
and change the seed type from''' point source to line source'''
+
  
 
|-
 
|-
Line 498: Line 407:
 
Click on the Y axis  
 
Click on the Y axis  
  
 +
Click on the X axis
  
 +
Delete this
  
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can see the '''X''', '''Y''' and '''Z''' '''axis''' which are visible  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can see the '''X, Y''' and '''Z axes''' which are visible
  
  
select any one of these axis  
+
Select any of these axis in which you would like to view the '''stream lines'''
 
+
 
+
in which you would like to view the '''stream lines'''.
+
  
  
Line 512: Line 420:
  
  
You can see the '''streamlines''' along the Y axis.
+
You can see the '''streamlines''' along the Y axis
  
  
Similarly you can select the '''X axis''' and  
+
Similarly you can select the '''X axis''' and plot the '''streamlines''' along the '''X axis'''
 
+
 
+
'''plot streamlines''' along the '''X axis'''
+
  
  
Line 528: Line 433:
  
 
Save as .csv format
 
Save as .csv format
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can also plot the velocity along the x and y axis using plot over line
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can also plot the '''velocity''' along '''X''' and '''Y''' axis using '''plot over line'''
  
To do this go to '''Filter > Data Analysis > Plot over line'''
+
To do this go to '''Filters > Data Analysis and Plot over line'''
  
Save the data as''' .(dot) csv''' file from file menu
+
Save the data as''' dot csv''' from the '''File''' menu
  
Click on '''save data'''
+
Click on '''Save Data'''
  
 
|-
 
|-
Line 543: Line 448:
  
 
For Re= 10000
 
For Re= 10000
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can plot this data in '''libreoffice spreadsheet '''or any other '''plotting''' software of your choice
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| You can plot this data in '''LibreOffice spreadsheet '''or any other '''plotting''' software of your choice
  
 
Now let me switch back to the slides
 
Now let me switch back to the slides
  
The results obtained can be '''validated''' by results obtained by '''Ghia et.al for Reynolds No , Re= 10000'''
+
The results obtained can be '''validated''' by using results of '''Ghia et.al for Reynolds Number, Re equal to 10000'''
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide :  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 7:  
  
 
Summary
 
Summary
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Thats all we have in this tutorial
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| That's all we have in this tutorial
 
+
Let us summarise
+
 
+
In this tutorial we learnt '''Turbulent Flow in a Lid Driven Cavity'''
+
  
And '''plotting streamlines '''in''' paraView'''
+
Let us summarise.
 +
*'''Turbulent Flow in a Lid Driven Cavity'''
 +
*and plotting '''stream lines '''in''' ParaView'''
  
 
This brings us to the end of the tutorial
 
This brings us to the end of the tutorial
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide : Assignment
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 8: Assignment
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| As an assignment
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| As an assignment
  
Modify the '''grid size''' of the cavity
+
* Modify the '''grid size''' of the '''cavity'''
  
Change it to (100 100 1)
+
* Change it to 100 100 1
  
Visualise the results in paraview using '''streamlines'''
+
* And visualise the results in '''ParaView''' using '''streamlines'''
  
 
|-
 
|-
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|  
 
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|  
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The video available at this URL:
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|  
 +
* Watch the video available at this URL:
  
 
http://spoken-tutorial.org/What_is_a_Spoken_Tutorial  
 
http://spoken-tutorial.org/What_is_a_Spoken_Tutorial  
  
It summarizes the Spoken Tutorial project.
+
* It summarizes the Spoken Tutorial project  
  
If you do not have good bandwidth, you can download and watch it.
+
* If you do not have good bandwidth, you can download and watch it
  
 
|-
 
|-
Line 591: Line 495:
 
-Gives certificates to those who pass an online test  
 
-Gives certificates to those who pass an online test  
  
-For more details, please write to us at
+
-For more details please write to  
  
contact@spoken-tutorial.org  
+
contact at the rate spoken hyphen tutorial dot org  
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide:  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 9:  
  
 
Forum to answer questions
 
Forum to answer questions
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Do you have questions on THIS Spoken Tutorial?
+
* Do you have questions on THIS Spoken Tutorial?
Choose the minute and second where you have the question
+
* Choose the minute and second where you have the question
Explain your question briefly
+
* Explain your question briefly
Someone from the FOSSEE team will answer them. Please visit
+
* Someone from the FOSSEE team will answer them. Please visit
 
http://forums.spoken-tutorial.org/
 
http://forums.spoken-tutorial.org/
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide:  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 10:  
  
 
Forum to answer questions
 
Forum to answer questions
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Questions not related to the Spoken Tutorial?
+
* Questions not related to the Spoken Tutorial?
Do you have general/technical questions on the Software?
+
* Do you have general/technical questions on the Software?
Please visit the FOSSEE forum
+
* Please visit the FOSSEE forum
 
http://forums.fossee.in/
 
http://forums.fossee.in/
Choose the Software and post your question
+
* Choose the Software and post your question
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|
  
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide:  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 11:  
  
 
Lab Migration Project
 
Lab Migration Project
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| We coordinate migration from commercial CFD software like ANSYS to OpenFOAM
+
* We coordinate migration from commercial CFD software like ANSYS to OpenFOAM
We conduct free Workshops and provide solutions to CFD Problem Statements in OpenFOAM
+
* We conduct free Workshops and provide solutions to CFD Problem Statements in OpenFOAM
 
For more details visit this site:
 
For more details visit this site:
 
http://cfd.fossee.in/
 
http://cfd.fossee.in/
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|
  
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide:  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 12:  
  
 
Case Study Project
 
Case Study Project
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|  We invite students to solve a feasible CFD problem statement of reasonable complexity using OpenFOAM
+
* We invite students to solve a feasible CFD problem statement of reasonable complexity using OpenFOAM
We give honorarium and certificate to those who do this
+
* We give honorarium and certificate to those who do this
 
For more details visit this site:
 
For more details visit this site:
 
http://cfd.fossee.in/
 
http://cfd.fossee.in/
 +
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| 
  
  
 
|-
 
|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|  
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 13: Acknowledgements
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Spoken Tutorials are part of Talk to a Teacher project,
+
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Spoken Tutorials project is a part of the Talk to a Teacher project
 
+
It is supported by the National Mission on Education through ICT, MHRD, Government of India.
+
  
This project is coordinated by http://spoken-tutorial.org
+
It is supported by the National Mission on Education through ICT, MHRD, Government of India
  
More information on the same is available at the following URL link http://spoken-tutorial.org/NMEICT-Intro
+
More information on the this mission is available at this URL http://spoken-tutorial.org/NMEICT-Intro
  
 
|-
 
|-

Latest revision as of 14:41, 5 August 2019

Tutorial: Turbulent flow in a lid driven cavity


Script : Chaitanya Talnikar, Shekhar Mishra , Rahul Joshi


Narration : Rahul Joshi


Keywords: Video tutorial ,CFD,Turbulent Flow in Lid driven cavity,OpenFOAM.


Visual Cue
Narration
Slide 1: Hello and welcome to the spoken tutorial on modelling Turbulent flow in a Lid Driven Cavity using OpenFOAM
Slide 2:


Learning Objectives

In this tutorial I will show you
  • Solving turbulent case in OpenFOAM and
  • Plotting streamlines in ParaView
Slide 3:


System Requirement

To record this tutorial I am using
  • Linux operating system Ubuntu version 12.04
  • OpenFoam version 2.1.1 and
  • ParaView version 3.12.0
Slide 4:

System Requirement

  • The tutorials were recorded using the versions specified in previous slide
  • Subsequently the tutorials were edited to latest versions
  • To install latest system requirements go to Installation Sheet
Slide 5 :


Prerequisites

To practice this tutorial you should have some basic knowledge of
  • Turbulence modelling
  • Knowledge of how to solve flow in a Lid driven cavity
  • If not so please refer to the relevant tutorial on our website
Demo:

Set up working Directory


This problem is identical in geometry and boundary condition to the 'Lid Driven Cavity' problem discussed in the basic level tutorial


Please make a note this problem is already set up in pisoFoam solver in OpenFoam directory


The boundary conditions are the Lid velocity U is 1 m/s


And we are solving this for a Reynolds number Re equal to 10000

Slide 6: Solver We are using a Transient solver for incompressible turbulent flow of Newtonian fluids called as pisoFoam
Steps in setting up the problem Now let us open the Terminal window by pressing Ctrl+Atl+T keys together
In the terminal window

Type cd tutorials

In the terminal window type run and press Enter


Now type cd space tutorials and press Enter

Type cd incompressible Now type cd space incompressible and press Enter
Type cd pisoFoam Now type cd space pisoFoam (Note that F here is capital ) and press Enter
Type ls


Two Folders les and ras


Cavity folder inside RAS

Now type ls and press Enter


In this you will see two folders les and ras


Our problem setup is inside ras folder which is called as reynolds averaged stress

Type cd ras


ls

Our folder name is cavity


Now type cd space ras and press Enter


Now type ls and press Enter

Type cd cavity

ls

You can see the cavity folder. Let me clear this off


Now type cd space cavity and press Enter


Now type ls and press Enter

Point to the 3 folders

Boundary and Initial conditions


0 folder

You can see three folders 0, constant and system


The initial conditions are specified within the files in the '0' directory


Now let us take a look at the files in the '0' directory

Inside the 0 folder


Type ls

To do this, in the command terminal type cd space 0 and press Enter


Now type ls and press Enter

Point to the files as per narration You can see the files named as epsilon, k, nut, nutilda, p, R and U


These files are to be kept as default until the inlet parameters don't change


If any changes are to be done please refer to the tutorial on Simulating flow in a channel using OpenFoam, to calculate these values

Type cd.. Now type cd space dot dot and press Enter


Let me clear this off

Type cd constant

Type ls

Let us open the constant folder


To do this type cd space constant and press Enter


Now type ls and press Enter

PolyMesh folder and fluid property files In this you will see the polyMesh folder containing
  • the geometry of the case inside blockMeshDict
  • and the fluid properties
Point to the two files as per narration In this case you will see two more files other than transportProperties named as RASProperties and turbulenceProperties


Let us open these two files

RASProperties In the terminal type gedit (space) RASProperties and press Enter


Scroll down


RASProperties contain the Reynolds average stress model for this case, which is kept as kEpsilon


Close this

turbulentProperties Now in the command terminal, type gedit space turbulentproperties and press Enter


Scroll down


The simulation type model for this case is kept as RASModel


Close this

TransportModel


Change the value of viscosity

Now let us open the transportProperties model


To do this, in the terminal type gedit space transportProperties and press Enter


The transportModel we are using here is Newtonian and the Viscosity is kept as 1 e raise to -4


Close this

Do not change the blockMeshDict file


The system folder is to be kept default

We are not changing the geometry in this case


So we need not go inside the polyMesh folder and look at the blockMeshDict file


It can be kept as it is

Type cd.. In the terminal type cd space dot dot and press Enter


We will keep the system folder default as there are no changes inside it

Meshing the geometry


blockMesh


Meshing is done

Now, we are done with the setup


We can mesh the geometry


To do this in the terminal window type blockMesh and press Enter


Meshing has been done

Running the solver : pisoFoam Now we can run the solver


To do this in the terminal type pisoFoam and press Enter

The iterations running can be seen in the terminal window


It may take some time for the iterations to stop

Post-processing the results in paraview The iterations running will stop at the end of the time step


To visualize the results let us open the ParaView window


To do this in the terminal type paraFoam and press Enter


This will open the ParaView window

View the geometry


Lid driven cavity geometry


Change the drop down menu from solid color to U

On the left hand side in the Object Inspector menu click on Apply


You can see the lid driven cavity geometry


A common visualization is surface plots


Change the display to Surface in the column.

And from the drop down menu change from solid colour to capital U


You can see the initial condition of velocity

Click on the Play button on VCR control for animation


Toggle on the color legend

Now on the top of the ParaView window you can see the VCR control


Click on the Play button


You can see the motion of the fluid inside the cavity


You can also toggle on the colour legend from the left hand side top of ParaView active variable control menu


Click on it. You can see the colour legend

Visualise the streamlines


Filters > Common > Stream Tracers


Now to visualise the stream lines
  • On top of the menu bar of ParaView
  • Go to Filters > Common and Stream Tracer
  • Click on it
Streamlines on top On the left hand side of the Object inspector menu you can see Apply. Click on it


You can see the stream lines at the centre of the lid driven cavity

Streamlines view You can also change the orientation in which the stream lines are viewed


To do this , scroll down


You can see the seed type

Shift to right >> change point source to line source Let me shift this to the right and change from point source to line source
Plot streamlines about X, Y and Z axis


Click on the Y axis

Click on the X axis

Delete this

You can see the X, Y and Z axes which are visible


Select any of these axis in which you would like to view the stream lines


I will select the Y axis and click Apply


You can see the streamlines along the Y axis


Similarly you can select the X axis and plot the streamlines along the X axis


Now delete this

Plot data over line


Save as .csv format

You can also plot the velocity along X and Y axis using plot over line

To do this go to Filters > Data Analysis and Plot over line

Save the data as dot csv from the File menu

Click on Save Data

Plot the results


Validate the results with Ghia et.al.

For Re= 10000

You can plot this data in LibreOffice spreadsheet or any other plotting software of your choice

Now let me switch back to the slides

The results obtained can be validated by using results of Ghia et.al for Reynolds Number, Re equal to 10000

Slide 7:

Summary

That's all we have in this tutorial

Let us summarise.

  • Turbulent Flow in a Lid Driven Cavity
  • and plotting stream lines in ParaView

This brings us to the end of the tutorial

Slide 8: Assignment As an assignment
  • Modify the grid size of the cavity
  • Change it to 100 100 1
  • And visualise the results in ParaView using streamlines
  • Watch the video available at this URL:

http://spoken-tutorial.org/What_is_a_Spoken_Tutorial

  • It summarizes the Spoken Tutorial project
  • If you do not have good bandwidth, you can download and watch it
The Spoken Tutorial Project Team

-Conducts workshops using spoken tutorials

-Gives certificates to those who pass an online test

-For more details please write to

contact at the rate spoken hyphen tutorial dot org

Slide 9:

Forum to answer questions

  • Do you have questions on THIS Spoken Tutorial?
  • Choose the minute and second where you have the question
  • Explain your question briefly
  • Someone from the FOSSEE team will answer them. Please visit

http://forums.spoken-tutorial.org/

Slide 10:

Forum to answer questions

  • Questions not related to the Spoken Tutorial?
  • Do you have general/technical questions on the Software?
  • Please visit the FOSSEE forum

http://forums.fossee.in/

  • Choose the Software and post your question


Slide 11:

Lab Migration Project

  • We coordinate migration from commercial CFD software like ANSYS to OpenFOAM
  • We conduct free Workshops and provide solutions to CFD Problem Statements in OpenFOAM

For more details visit this site: http://cfd.fossee.in/


Slide 12:

Case Study Project

  • We invite students to solve a feasible CFD problem statement of reasonable complexity using OpenFOAM
  • We give honorarium and certificate to those who do this

For more details visit this site: http://cfd.fossee.in/


Slide 13: Acknowledgements Spoken Tutorials project is a part of the Talk to a Teacher project

It is supported by the National Mission on Education through ICT, MHRD, Government of India

More information on the this mission is available at this URL http://spoken-tutorial.org/NMEICT-Intro

About the contributor The script is contributed by Shekhar Mishra and Chaitanya talnikar

This is Rahul Joshi from IIT BOMBAY signing off.

Thanks for joining

Contributors and Content Editors

DeepaVedartham, Nancyvarkey, Pravin1389, Rahuljoshi