Difference between revisions of "OpenFOAM/C3/Flow-over-a-flat-plate/English"

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|-
 
|-
 
| Slide 1
 
| Slide 1
−
| Hello and welcome to the spoken tutorial on Flow over a flat plate using '''OpenFOAM'''.
+
| Hello and welcome to the spoken tutorial on '''Flow over a flat plate using OpenFOAM'''.
  
 
|-
 
|-
Line 17: Line 17:
 
| In this tutorial I will teach you about   
 
| In this tutorial I will teach you about   
  
−
* Geometry of the flat plate  
+
* Geometry of the '''flat plate'''
−
* Changing the grid spacing in '''meshing'''
+
* Changing the '''grid spacing''' in '''meshing'''
−
* Post Processing results in '''ParaView''' and
+
* '''Post processing''' results in '''ParaView''' and
−
* Visualizing using '''Vector Plot'''.
+
* '''Visualizing''' using '''Vector Plots'''
  
 
|-
 
|-
Line 29: Line 29:
  
 
I am using  
 
I am using  
−
* '''Linux''' Operating system '''Ubuntu''' version 12.04.
+
* '''Linux''' Operating system '''Ubuntu''' version 12.04  
 
*'''OpenFOAM''' version 2.1.1 and  
 
*'''OpenFOAM''' version 2.1.1 and  
 
*'''ParaView''' version 3.12.0  
 
*'''ParaView''' version 3.12.0  
Line 42: Line 42:
  
 
* To install latest system requirements go to Installation Sheet
 
* To install latest system requirements go to Installation Sheet
−
 
+
|
  
 
|-
 
|-
 
| Slide 5: Flow over Flat Plate
 
| Slide 5: Flow over Flat Plate
  
−
|'''Flow over flat plate''' is a '''fundamental problem in fluid mechanics'''
+
|'''Flow''' over '''flat plate''' is a fundamental problem in '''fluid mechanics'''.
  
 
|-
 
|-
Line 53: Line 53:
  
 
Flow over a flat plate diagram
 
Flow over a flat plate diagram
−
| We can visualise the growth of '''boundary layer'''
+
| We can '''visualise''' the growth of the '''boundary layer'''.
  
−
'''Boundary layer''' is a very thin region above the body  
+
'''Boundary layer''' is a very thin region above the body where the velocity is 0.99 times the '''free stream velocity'''.
−
 
+
−
where the velocity is 0.99 times the '''free stream velocity'''.
+
  
 
|-
 
|-
 
| Slide 7: Diagram of boundary conditions.
 
| Slide 7: Diagram of boundary conditions.
−
| This is a '''diagram''' of '''flow over the flat plate'''
+
| This is a diagram of the '''flow''' over the '''flat plate'''.
  
−
The''' boundary conditions''' are given as follows
+
The''' boundary conditions''' are given as follows-
  
 
*You have the '''Inlet'''  
 
*You have the '''Inlet'''  
−
*the '''Plate'''  
+
*The '''Plate'''  
−
*'''Top''' – which is the '''Farfield'''
+
*'''Top''' which is the '''Farfield'''
−
*and '''Outlet''' – which is the''' pressure outlet boundary'''
+
*and '''Outlet''' which is the''' pressure outlet boundary'''
 
|-
 
|-
 
| Slide 8: Inlet parameters
 
| Slide 8: Inlet parameters
 
|
 
|
−
* The Free stream velocity '''U = 1 m/s''', and  
+
* The '''Free stream velocity U''' is '''1 m/s''', and  
  
−
* we are solving this for '''Reynolds no (Re) = 100'''
+
* We are solving this for a '''Reynolds number (Re) = 100'''
  
 
|-
 
|-
−
| Click on home>> OpenFoam >> Run >> Tutorials >> Incompressible >> SimpleFoam
+
| Click on Home>> OpenFoam
−
|Now let us Go to the '''Home''' folder, In the '''Home''' folder, click on the '''OpenFoam''' folder
+
|Now let us go to the '''Home''' folder.
  
−
Then go to the '''Run''' '''directory '''
+
In the '''Home''' folder, click on the '''OpenFoam''' folder.
  
−
You will see '''Tutorials. '''Click on it.  
+
|-
 +
| Click on Run >> Tutorials
 +
|Then go to the '''Run''' directory.
  
−
'''Scroll down''' and then click on '''Incompressible.'''
+
You will see '''Tutorials.''' Click on it.
  
−
'''Scroll down'''.  
+
|-
 +
| Click on Incompressible >> SimpleFoam
 +
|Scroll down and then click on '''Incompressible'''.
  
−
You will see the '''simpleFoam '''folder.
+
Scroll down.
  
−
Click on it
+
You will see the '''simpleFoam '''folder, click on it.
  
−
This '''solver''' suits our case.
+
This '''solver''' suits our '''case'''.
  
 
|-
 
|-
 
| Right click >> Create new folder >> flatplate
 
| Right click >> Create new folder >> flatplate
−
| In this, create a '''folder''' by the name '''flatplate.'''
+
| In this, create a '''folder''' by the name '''flatplate'''
  
−
Right click - '''Create New Folder -''' '''flatplate'''
+
Right click '''Create New Folder flatplate'''
  
 
|-
 
|-
−
| Double-click '''pitzdaily '''folder
+
| Double-click '''pitzdaily '''folder.
−
| Now, let's open the '''pitzdaily case.'''  
+
| Now, let us open the '''pitzdaily case'''.
  
 
|-
 
|-
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|-
 
|-
−
| Select '''0''', '''constant '''and '''system '''folders
+
| Select '''0,constant '''and '''system '''folders
−
| Copy the '''three folders''' - '''0''', '''constant '''and '''system'''
+
| Copy the three folders '''0, constant '''and '''system'''.
  
 
|-
 
|-
−
| Copy them
+
| Ctrl + C.
−
| Copy this
+
| Copy this.
  
 
|-
 
|-
−
| Go back to '''SimpleFoam''' >> '''flatplate '''folder
+
| Go back to '''SimpleFoam''' >> '''flatplate '''folder.
  
−
Paste them there
+
Paste them there.
−
| Now let us go one level back.  
+
| Now let us go one level back.
  
−
Paste these  three '''folders''' inside the''' flatplate '''folder.
+
Paste these  three folders inside the''' flatplate '''folder.
  
 
|-
 
|-
 
| Click on '''constant >> polyMesh'''
 
| Click on '''constant >> polyMesh'''
−
| Open the '''constant folder''' and then the '''polyMesh folder'''
+
| Open the '''constant''' folder and then the '''polyMesh''' folder.
  
 
|-
 
|-
 
|
 
|
−
| Change the geometry and boundary condition names in the '''blockMeshDict '''file.
+
| Change the '''geometry''' and '''boundary condition''' names in the '''blockMeshDict '''file.
  
 
|-
 
|-
−
|
+
|Open '''blockMeshDict''' file >> Scroll down.
 
| I have already made the changes.
 
| I have already made the changes.
  
−
Let us open the '''blockMeshDict''' file . Scroll down
+
Let us open the '''blockMeshDict''' file. Scroll down.
  
−
The geometry is in '''meters'''.
+
The '''geometry''' is in '''meters'''.
  
 
|-
 
|-
 
|
 
|
−
| We have set the '''dimensions''' of the '''flatplate'''
+
| We have set the '''dimensions''' of the '''flatplate'''.
  
 
|-
 
|-
 
| Simplegrading (1 3 1)  
 
| Simplegrading (1 3 1)  
−
| We can see that '''simpleGrading. '''
+
| You can see the '''simpleGrading.'''
  
−
It is kept as (1 3 1) as we need a finer '''mesh''' near the plate.
+
It is kept as (1 3 1) as we need a finer '''mesh''' near the '''plate'''.
  
 
|-
 
|-
−
|
+
|Go two '''levels''' back
−
| Now close this.  
+
| Now close this.
  
 
Go two '''levels''' back.
 
Go two '''levels''' back.
  
 
|-
 
|-
−
|
+
|Make changes in the '''boundary condition'''
−
| Similarly, make changes in the '''boundary condition''' names inside the '''files''' in the '''0''' folder.
+
| Similarly, make changes in the '''boundary condition''' names inside the files in the '''0''' folder.
  
−
These '''files''' have '''pressure''', '''velocity''' and '''wall''' functions.
+
These files have '''pressure, velocity''' and '''wall functions'''.
  
 
|-
 
|-
−
|
+
|Go one '''level''' back.
−
| To '''calculate''' the values of '''wall''' functions,  
+
| To calculate the values of '''wall functions''', please refer to the earlier '''tutorials''' in the '''OpenFoam''' series.
−
 
+
−
 
+
−
please refer to the earlier '''tutorials''' in the '''OpenFoam''' series.
+
  
 
Let us go one '''level''' back.
 
Let us go one '''level''' back.
Line 173: Line 172:
 
|-
 
|-
 
|
 
|
−
| The '''system''' folder can be kept '''default'''
+
| The '''system''' folder can be kept '''default'''.
  
−
Let us close this
+
Let us close this.
  
 
|-
 
|-
−
|Let us Open the terminal window :
+
|Let us open the '''terminal''' window :
  
 
Press Ctrl+Alt+t keys simultaneously
 
Press Ctrl+Alt+t keys simultaneously
−
| Now let us open the '''terminal window.'''
+
| Now let us open the '''terminal '''window.
  
−
In the '''terminal window''', type '''run '''and press '''Enter.'''
+
In the '''terminal''' window, type '''run '''and press '''Enter'''.
  
 
|-
 
|-
 
| Type cd tutorials  
 
| Type cd tutorials  
−
| Type '''cd space tutorials '' press''' Enter.'''
+
| Now type '''cd space tutorials '' press''' Enter'''.
  
 
|-
 
|-
 
| Type cd incompressible  
 
| Type cd incompressible  
−
| Type '''cd incompressible '''press''' Enter.'''
+
| Now type '''cd incompressible '''press''' Enter'''.
  
 
|-
 
|-
 
| Type cd simpleFoam  
 
| Type cd simpleFoam  
−
| Type '''cd space simpleFoam '''press''' Enter.'''
+
| Now type '''cd space simpleFoam '''press''' Enter'''.
  
 
|-
 
|-
 
| Type ls  
 
| Type ls  
−
| Now type '''ls'''  and press '''Enter.'''
+
| Now type '''ls'''  and press '''Enter'''.
  
 
|-
 
|-
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|-
 
|-
 
| Type cd flatplate
 
| Type cd flatplate
−
| Now type '''cd space flatplate '''and press '''Enter.'''
+
| Now type '''cd space flatplate '''and press '''Enter'''.
  
 
|-
 
|-
 
| Type ls
 
| Type ls
−
| Now type '''ls''' and press '''Enter.'''
+
| Now type '''ls''' and press '''Enter'''.
  
 
|-
 
|-
 
|
 
|
−
| You can see the three '''folders''' '''0,constant''' and '''system.'''
+
| You can see the three folders '''0, constant''' and '''system'''.
  
 
|-
 
|-
 
| Type blockMesh
 
| Type blockMesh
−
| Now, we will mesh the geometry.  
+
| Now, we will mesh the '''geometry'''.
  
 
We are using a '''course mesh''' for this problem.
 
We are using a '''course mesh''' for this problem.
Line 227: Line 226:
 
|-
 
|-
 
|
 
|
−
| Press '''Enter.'''
+
| Press '''Enter'''.
  
 
'''Meshing''' has been done.
 
'''Meshing''' has been done.
Line 233: Line 232:
 
|-
 
|-
 
|
 
|
−
| Note that if there is some error in the '''blockMesh''' file,
+
| Note that if there is some error in the '''blockMesh''' file.
  
 
it will be shown in the '''terminal''' window.
 
it will be shown in the '''terminal''' window.
Line 239: Line 238:
 
|-
 
|-
 
| Type paraFoam
 
| Type paraFoam
−
| To view the geometry, type “'''paraFoam'''”
+
| To view the '''geometry''', type '''paraFoam''' and press '''Enter'''.
−
 
+
−
press '''Enter.'''
+
  
 
|-
 
|-
−
| Paraview window click on APPLY button on left hand side
+
| '''Paraview''' window >> click on '''APPLY''' button
  
 
| After the '''ParaView''' window opens, on the left hand side of the '''object inspector''' menu, click '''Apply'''.
 
| After the '''ParaView''' window opens, on the left hand side of the '''object inspector''' menu, click '''Apply'''.
Line 250: Line 247:
 
We can see the '''geometry'''.
 
We can see the '''geometry'''.
  
−
Close the '''ParaView''' window.
+
|-
 +
|Close the '''ParaView''' window.
 +
|Close the '''ParaView''' window.
  
−
Let me switch back to the''' slides.'''
+
Let me switch back to the''' slides'''.
  
 
|-
 
|-
 
| Slide 9: solver
 
| Slide 9: solver
−
| The solver we are using here is: '''simpleFoam.'''
+
| The '''solver''' we are using here is '''simpleFoam'''
−
 
+
−
'''SimpleFoam''' is a '''steady state solver '''for '''incompressible '''
+
  
−
and''' turbulent''' flows
+
'''SimpleFoam''' is a '''steady state solver '''for *'''incompressible'''
 +
*and''' turbulent flows'''
  
 
|-
 
|-
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| Let me switch back to the '''terminal '''window.
 
| Let me switch back to the '''terminal '''window.
  
−
In the '''terminal window''' ,type '''simpleFoam''' and press '''Enter.'''
+
In the '''terminal''' window, type '''simpleFoam''' and press '''Enter'''.
  
  
Line 278: Line 276:
  
 
|-
 
|-
−
| In the Paraview window click on APPLY button on left hand side
+
| In the '''Paraview''' window click on '''APPLY''' button on left hand side
−
| On the left hand side of the '''Object Inspector''' menu, click '''Apply to '''view the geometry.  
+
| On the left hand side of the '''Object Inspector''' menu, click '''Apply''' to view the '''geometry'''.
  
 
|-
 
|-
 
| Properties
 
| Properties
−
| Scroll down the '''properties''' panel of the '''Object Inspector''' menu for '''time step''', '''regions''' and '''fields'''
+
| Scroll down the '''properties''' panel of the '''Object Inspector''' menu for '''time step, regions''' and '''fields'''.
  
 
|-
 
|-
 
| Change the drop down menu from Solid Color to U
 
| Change the drop down menu from Solid Color to U
−
| To view the '''contours''' from the''' '''drop down menu,  
+
| To view the '''contours''' from the drop down menu,  
−
 
+
*in the '''Active Variable Control '''menu,
−
in the '''Active Variable Control '''menu,
+
*change from '''solid color''' to '''capital U'''
−
 
+
−
change from '''solid color''' to '''capital U'''
+
  
 
|-
 
|-
 
|
 
|
−
| You can see the initial condition of the '''velocity'''
+
| You can see the initial '''condition''' of the '''velocity'''.
  
 
|-
 
|-
 
| VCR control
 
| VCR control
−
| Now on top of the '''ParaView''' window, you will see the '''VCR''' controls.
+
| Now on top of the '''ParaView''' window, you will see the '''VCR''' control.
  
 
|-
 
|-
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|-
 
|-
 
|
 
|
−
| You will see the '''contour''' of '''Pressure''' or '''Velocity''' on the flat plate accordingly
+
| You will see the '''contour''' of '''Pressure''' or '''Velocity''' on the '''flat plate''' accordingly.
  
 
|-
 
|-
 
| Toggle on the '''Color legend'''
 
| Toggle on the '''Color legend'''
−
| This is the '''velocity contour'''
+
| This is the '''velocity contour'''.
  
−
'''Toggle''' on the '''Color legend'''
+
'''Toggle''' on the '''Color legend'''.
  
 
|-
 
|-
 
| Color legend left hand side top icon
 
| Color legend left hand side top icon
−
| To do this, click on the '''color legend '''icon on the '''Active Variable Control''' menu
+
| To do this, click on the '''color legend '''icon on the '''Active Variable Control''' menu.
  
 
|-
 
|-
 
| Click on APPLY button
 
| Click on APPLY button
−
| Click '''Apply''' in the '''Object inspector '''menu
+
| Click '''Apply''' in the '''Object inspector '''menu.
  
 
|-
 
|-
 
| Click on Display
 
| Click on Display
−
| In the '''Object inspector '''menu, click on '''Display'''  
+
| In the '''Object inspector '''menu, click on '''Display'''.
  
 
|-
 
|-
 
| Click on rescale to data range
 
| Click on rescale to data range
−
|'''Scroll down''' and click on '''Rescale''' '''to data range'''
+
|Scroll down and click on '''Rescale to data range'''.
  
 
|-
 
|-
 
| Shift color legend on top of the geometry
 
| Shift color legend on top of the geometry
−
| Let me shift this '''Color legend''' on top
+
| Let me shift this '''Color legend''' on top.
  
 
|-
 
|-
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|-
 
|-
−
|
+
|Go to '''Properties'''
−
| Go to the '''Properties''' in '''Object Inspector menu'''
+
| Go to the '''Properties''' in '''Object Inspector menu'''.
  
 
|-
 
|-
−
|
+
|Click '''Apply'''
−
| Click '''Apply''' on the left hand side of '''Object Inspector Menu'''.
+
| Click '''Apply''' on the left hand side of '''Object Inspector''' menu.
  
 
|-
 
|-
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|-
 
|-
−
| Scroll down and click on edit button
+
| Scroll down and click on '''Edit''' button
  
 
set scale factor 0.1
 
set scale factor 0.1
−
| Also, the size of the '''vectors''' can be changed by '''clicking''' on the '''Edit''' button.  
+
| Also, the size of the '''vectors''' can be changed by clicking on the '''Edit''' button.
  
−
The '''set scale''' '''factor''' can be changed to '''0.1'''
+
The '''set scale factor''' can be changed to '''0.1'''
  
 
|-
 
|-
−
| Click the apply button
+
| Click the '''Apply''' button
 
| Again, click the '''Apply''' button.
 
| Again, click the '''Apply''' button.
  
 
|-
 
|-
 
|
 
|
−
| Now let me zoom this
+
| Now let me zoom this.
  
 
|-
 
|-
 
| Click on ZoomToBox icon  
 
| Click on ZoomToBox icon  
−
| To do this, in the '''Active Variable Control '''menu, click on '''zoomToBox '''option
+
| To do this, in the '''Active Variable Control '''menu, click on the '''zoomToBox '''option.
  
 
|-
 
|-
 
|
 
|
−
| And '''zoom''' over any area that you desire
+
| And zoom over any area that you desire.
  
 
|-
 
|-
 
| Parabolic variation of vector plot
 
| Parabolic variation of vector plot
−
| We can see the '''parabolic variation''' of '''vector plot '''as the '''flow''' moves over the''' plate'''.
+
| We can see the '''parabolic variation''' of '''vector plots '''as the '''flow''' moves over the''' plate'''.
  
 
|-
 
|-
 
| Delete the vector plot
 
| Delete the vector plot
−
| Delete this. Now delete the '''vector plot.'''
+
| Delete this. Now delete the '''vector plot'''.
  
 
|-
 
|-
 
| Corresponding to color of 1 in color legend
 
| Corresponding to color of 1 in color legend
−
| Also, we can see that the color near to 1
+
| Also, we can see that the color near to 1 corresponds to the '''velocity''' of '''0.99 '''times the '''free stream velocity'''.
−
 
+
−
corresponds to the '''velocity''' of '''0.99 '''times the free stream velocity.
+
  
 
|-
 
|-
 
| To plot the data along x and y axis
 
| To plot the data along x and y axis
−
| You can also plot the '''variation''' of velocity along the '''x '''and '''y '''axes using the '''plot data over line'''.
+
| We can also plot the '''variation''' of velocity along the '''x '''and '''y '''axes using the '''plot data over line'''.
  
 
|-
 
|-
 
| Slide 10: Summary
 
| Slide 10: Summary
−
| This brings us to the end of the tutorial.  
+
| This brings us to the end of the tutorial.
  
 
In this tutorial we learnt :
 
In this tutorial we learnt :
  
−
* '''Geometry and meshing''' of the '''flat plate geometry''' and
+
* '''Geometry''' and '''meshing''' of the '''flat plate geometry''' and
−
* Vector plotting in '''ParaView'''
+
* '''Vector''' plotting in '''ParaView'''
  
 
|-
 
|-
 
| Slide 11: Assignment
 
| Slide 11: Assignment
−
| As an Assignment,  
+
| As an assignment,  
  
−
Create a '''geometry''' of '''flow over a flat plate'''
+
Create a '''geometry''' of '''flow''' over the '''flat plate'''.
  
−
'''Refine the grid spacing''' near the plate
+
Refine the '''grid spacing''' near the '''plate'''.
  
 
|-
 
|-
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-For more details, please write to  
 
-For more details, please write to  
  
−
contact@spoken-tutorial.org  
+
contact at the rate spoken hyphen tutorial dot org  
  
 
|-
 
|-
Line 442: Line 436:
 
* 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/
−
 
+
|
 
|-
 
|-
 
| Slide 15: Forum to answer questions
 
| Slide 15: Forum to answer questions
Line 450: Line 444:
 
http://forums.fossee.in/
 
http://forums.fossee.in/
 
* Choose the Software and post your question
 
* Choose the Software and post your question
−
 
+
|
  
 
|-
 
|-
Line 458: Line 452:
 
For more details visit this site:
 
For more details visit this site:
 
http://cfd.fossee.in/
 
http://cfd.fossee.in/
−
 
+
|
  
 
|-
 
|-
Line 466: Line 460:
 
For more details visit this site:
 
For more details visit this site:
 
http://cfd.fossee.in/
 
http://cfd.fossee.in/
−
 
+
|
 
|-
 
|-
 
| Slide 18:
 
| Slide 18:
Line 476: Line 470:
 
| Spoken Tutorial project is a part of the Talk to a Teacher project,  
 
| Spoken Tutorial 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.
+
It is supported by the National Mission on Education through ICT, MHRD, Government of India
  
 
More information on this mission is available at this URL http://spoken-tutorial.org/NMEICT-Intro
 
More information on this mission is available at this URL http://spoken-tutorial.org/NMEICT-Intro
Line 482: Line 476:
 
|-
 
|-
 
| About the contributor
 
| About the contributor
−
| This is Rahul Joshi from IIT BOMBAY signing off.
+
| This is Rahul Joshi from IIT BOMBAY signing off
  
−
Thanks for joining.
+
Thanks for joining
  
 
|}
 
|}

Latest revision as of 10:56, 16 August 2019

Tutorial: Flow over a flat plate using OpenFOAM.

Script and Narration: Rahul Joshi

Keywords: Video tutorial, CFD, Flat plate, Boundary layer, glyph (vector plotting).

Visual Cue Narration
Slide 1 Hello and welcome to the spoken tutorial on Flow over a flat plate using OpenFOAM.
Slide 2 : Learning Objectives In this tutorial I will teach you about
  • Geometry of the flat plate
  • Changing the grid spacing in meshing
  • Post processing results in ParaView and
  • Visualizing using Vector Plots
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: Flow over Flat Plate Flow over flat plate is a fundamental problem in fluid mechanics.
Slide 6: Flow over Flat Plate

Flow over a flat plate diagram

We can visualise the growth of the boundary layer.

Boundary layer is a very thin region above the body where the velocity is 0.99 times the free stream velocity.

Slide 7: Diagram of boundary conditions. This is a diagram of the flow over the flat plate.

The boundary conditions are given as follows-

  • You have the Inlet
  • The Plate
  • Top which is the Farfield
  • and Outlet which is the pressure outlet boundary
Slide 8: Inlet parameters
  • The Free stream velocity U is 1 m/s, and
  • We are solving this for a Reynolds number (Re) = 100
Click on Home>> OpenFoam Now let us go to the Home folder.

In the Home folder, click on the OpenFoam folder.

Click on Run >> Tutorials Then go to the Run directory.

You will see Tutorials. Click on it.

Click on Incompressible >> SimpleFoam Scroll down and then click on Incompressible.

Scroll down.

You will see the simpleFoam folder, click on it.

This solver suits our case.

Right click >> Create new folder >> flatplate In this, create a folder by the name flatplate

Right click Create New Folder flatplate

Double-click pitzdaily folder. Now, let us open the pitzdaily case.
Zoom in Let me zoom this.
Select 0,constant and system folders Copy the three folders 0, constant and system.
Ctrl + C. Copy this.
Go back to SimpleFoam >> flatplate folder.

Paste them there.

Now let us go one level back.

Paste these three folders inside the flatplate folder.

Click on constant >> polyMesh Open the constant folder and then the polyMesh folder.
Change the geometry and boundary condition names in the blockMeshDict file.
Open blockMeshDict file >> Scroll down. I have already made the changes.

Let us open the blockMeshDict file. Scroll down.

The geometry is in meters.

We have set the dimensions of the flatplate.
Simplegrading (1 3 1) You can see the simpleGrading.

It is kept as (1 3 1) as we need a finer mesh near the plate.

Go two levels back Now close this.

Go two levels back.

Make changes in the boundary condition Similarly, make changes in the boundary condition names inside the files in the 0 folder.

These files have pressure, velocity and wall functions.

Go one level back. To calculate the values of wall functions, please refer to the earlier tutorials in the OpenFoam series.

Let us go one level back.

The system folder can be kept default.

Let us close this.

Let us open the terminal window :

Press Ctrl+Alt+t keys simultaneously

Now let us open the terminal window.

In the terminal window, type run and press Enter.

Type cd tutorials Now type cd space tutorials press' Enter.
Type cd incompressible Now type cd incompressible press Enter.
Type cd simpleFoam Now type cd space simpleFoam press Enter.
Type ls Now type ls and press Enter.
We can see the flatplate folder.
Type cd flatplate Now type cd space flatplate and press Enter.
Type ls Now type ls and press Enter.
You can see the three folders 0, constant and system.
Type blockMesh Now, we will mesh the geometry.

We are using a course mesh for this problem.

Meshing can be done by typing blockMesh in the terminal.

Press Enter.

Meshing has been done.

Note that if there is some error in the blockMesh file.

it will be shown in the terminal window.

Type paraFoam To view the geometry, type paraFoam and press Enter.
Paraview window >> click on APPLY button After the ParaView window opens, on the left hand side of the object inspector menu, click Apply.

We can see the geometry.

Close the ParaView window. Close the ParaView window.

Let me switch back to the slides.

Slide 9: solver The solver we are using here is simpleFoam

SimpleFoam is a steady state solver for *incompressible

  • and turbulent flows
Demo :

type simpleFoam

Let me switch back to the terminal window.

In the terminal window, type simpleFoam and press Enter.


You will see the iterations running in the terminal window.

Type paraFoam Once the solving is done, type paraFoam to view the results.
In the Paraview window click on APPLY button on left hand side On the left hand side of the Object Inspector menu, click Apply to view the geometry.
Properties Scroll down the properties panel of the Object Inspector menu for time step, regions and fields.
Change the drop down menu from Solid Color to U To view the contours from the drop down menu,
  • in the Active Variable Control menu,
  • change from solid color to capital U
You can see the initial condition of the velocity.
VCR control Now on top of the ParaView window, you will see the VCR control.
Click on Play button of VCR control Click on the Play button.
You will see the contour of Pressure or Velocity on the flat plate accordingly.
Toggle on the Color legend This is the velocity contour.

Toggle on the Color legend.

Color legend left hand side top icon To do this, click on the color legend icon on the Active Variable Control menu.
Click on APPLY button Click Apply in the Object inspector menu.
Click on Display In the Object inspector menu, click on Display.
Click on rescale to data range Scroll down and click on Rescale to data range.
Shift color legend on top of the geometry Let me shift this Color legend on top.
Top menu >> Filter > Common > glyph To visualize the Vector Plot,

go to the Filters Menu > Common > glyph

Go to Properties Go to the Properties in Object Inspector menu.
Click Apply Click Apply on the left hand side of Object Inspector menu.
Changing vector size You can change the number of vectors by changing their size at the bottom.
Scroll down and click on Edit button

set scale factor 0.1

Also, the size of the vectors can be changed by clicking on the Edit button.

The set scale factor can be changed to 0.1

Click the Apply button Again, click the Apply button.
Now let me zoom this.
Click on ZoomToBox icon To do this, in the Active Variable Control menu, click on the zoomToBox option.
And zoom over any area that you desire.
Parabolic variation of vector plot We can see the parabolic variation of vector plots as the flow moves over the plate.
Delete the vector plot Delete this. Now delete the vector plot.
Corresponding to color of 1 in color legend Also, we can see that the color near to 1 corresponds to the velocity of 0.99 times the free stream velocity.
To plot the data along x and y axis We can also plot the variation of velocity along the x and y axes using the plot data over line.
Slide 10: Summary This brings us to the end of the tutorial.

In this tutorial we learnt :

  • Geometry and meshing of the flat plate geometry and
  • Vector plotting in ParaView
Slide 11: Assignment As an assignment,

Create a geometry of flow over the flat plate.

Refine the grid spacing near the plate.

Slide 12 : About Spoken tutorials
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http://spoken-tutorial.org/What_is_a_Spoken_Tutorial

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contact at the rate spoken hyphen tutorial dot org

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

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http://forums.fossee.in/

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Slide 18:

Acknowledgement


Spoken Tutorial 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 this mission is available at this URL http://spoken-tutorial.org/NMEICT-Intro

About the contributor This is Rahul Joshi from IIT BOMBAY signing off

Thanks for joining

Contributors and Content Editors

DeepaVedartham, Nancyvarkey, Rahuljoshi, Sneha

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