Difference between revisions of "OpenFOAM/C3/Importing-mesh-file-in-OpenFOAM/English"

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Line 8: Line 8:
  
 
|-
 
|-
−
|| '''Slide 2'''  
+
|| '''Slide 2''' : '''Learning Objectives'''
−
'''Learning Objectives'''
+
  
−
|| In this tutorial, you will learn how to:
+
|| In this tutorial, you will learn to:
−
* import Mesh files
+
* import '''Mesh files'''
 
* from a meshing software
 
* from a meshing software
−
* in OpenFOAM.
+
* in '''OpenFOAM'''.
  
 
|-
 
|-
−
|| '''Slide 3 ''' : '''Pre-requisite'''
+
|| '''Slide 3''': '''System Requirement'''
  
−
|| As a pre-requisite, the user should know how to generate a Mesh in software
+
|| To record this tutorial I am using
−
like -'''Gambit, Ansys ICEM , CFX, Salome etc'''.
+
* '''Linux''' Operating system '''Ubuntu''' version 12.04.
 +
* '''OpenFOAM''' version 2.1.1
 +
* '''ParaView''' version 3.12.0
  
 +
|-
 +
|| '''Slide 4 ''' : '''Pre-requisite'''
 +
 +
|| As a pre-requisite, the user should know how to generate a Mesh in software like -
 +
 +
'''Gambit, Ansys ICEM , CFX, Salome etc'''.
  
 
|-
 
|-
−
|| '''Slide 3''': '''System Requirement'''
+
|| Slide 5:
 +
 
 
||  
 
||  
 +
*Using '''blockMesh''', we can easily make '''simple''' geometries.
 +
 +
*For example- '''box, pipe''' etc.
 +
 +
*It is difficult to create complex geometries using '''blockMesh'''.
  
 
|-
 
|-
−
|| Point to 1 on '''Level''' field.
+
||Slide 6:
−
|| We are at L'''evel''' 1.
+
||
−
Let us move on to the second level that is 2.
+
*But '''OpenFOAM''' supports importing '''mesh''' from third party '''meshing''' software.
 +
 
 +
*There are '''commands''' available in '''OpenFOAM''', to import these '''mesh''' files.
  
 
|-
 
|-
−
|| Select the triangle and click to increase the level to '''2'''.
+
||
−
|| To increase the level of the training to '''2''', click on the top triangle symbol, next to the Level field.
+
||We will now learn to '''import''' these files.
  
 
|-
 
|-
−
|| Point to the characters in the '''Teacher’s Line'''.
+
||Slide 7 : Geometry for the case
−
|| Notice what happens when we change the level to 2?
+
Point over the square cylinder
−
The characters in the '''Teacher’s Line '''change!
+
point over its length and height
 +
point on inlet velocity
 +
 
 +
 
 +
||Here is the geometry of our case.
 +
We have a '''square cylinder'''
 +
 
 +
*length 1m and height 1m.
 +
 
 +
*'''Inlet velocity''' is 1 m/s
 +
 
 +
*We are solving this for a '''Reynolds Number (Re)''' = 100
 +
 
 +
*The '''domain''' chosen is '''40'''m by '''60'''m
 +
 
 +
*The '''Boundary conditions are as shown in the diagram'''
 +
 
 +
|-
 +
||Slide 8 :
 +
 
 +
||This is the '''mesh''' file generated in a '''meshing''' software.
 +
 
 +
|-
 +
||Go to the OpenFOAM > xyz-
 +
2.1.1>run>tutorials>incompressible
 +
>icoFoam
 +
 
 +
||In your '''OpenFOAM working directory''', go to the '''icoFoam solver''' and click on it.
 +
 
 +
|-
 +
||Create a folder : cylinder
 +
 
 +
||Create a folder by the name '''cylinder'''
 +
 
 +
|-
 +
||Type cd (space) ..
 +
 
 +
||Now go to the '''cavity case'''.
 +
 
 +
|-
 +
||Copy 0 and system folder from
 +
cavity folder in icoFoam
 +
 
 +
||Copy the '''0 and system''' folders from the '''cavity''' case.
 +
 
 +
|-
 +
||Paste it in '''cylinder''' folder
 +
 
 +
||Paste it inside the '''cylinder''' folder.
 +
 
 +
|-
 +
||No constant folder
 +
 
 +
||Note that, you do not need the '''constant''' folder.
 +
 
 +
|-
 +
||Point over the '''.msh''' file on the desktop
 +
 
 +
||On my '''desktop''', I have a '''Fluent mesh file''' with a '''.(dot) msh''' extension.
 +
 
 +
It is named as '''cylmesh.msh'''
 +
 
 +
|-
 +
||Copy-and-paste >> cylinder folder.
 +
 
 +
||Copy-and-paste this file in the '''cylinder''' folder in '''icoFoam'''.
 +
 
 +
 
 +
Our setup is now ready.
 +
 
 +
|-
 +
||Ctrl+Alt+t keys simultaneously
 +
 
 +
||Open the '''command terminal'''.
 +
 
 +
|-
 +
||In the terminal window >> type run >> press Enter.
 +
 
 +
||Type '''run''' and press '''Enter'''.
 +
 
 +
|-
 +
||
 +
||Type '''cd tutorials'''; press '''Enter'''.
 +
 
 +
|-
 +
||Type incompressible and press
 +
Enter
 +
 
 +
||Type '''cd incompressible'''; press '''Enter'''
 +
 
 +
|-
 +
|| Type '''icoFoam''' and press '''Enter'''
 +
 
 +
||Type '''cd icoFoam'''; press '''Enter'''
 +
 
 +
|-
 +
||Type cylinder and press Enter
 +
 
 +
|| Type '''cd cylinder''' and press '''Enter'''.
 +
 
 +
|-
 +
||On the terminal >> type fluentMeshToFoam cylmesh.msh
 +
 
 +
>>Enter
 +
 
 +
|| For a '''Fluent mesh''' file, in the '''command terminal''' we need to type
 +
 
 +
'''fluentMeshToFoam (space) cylmesh.msh'''
 +
 
 +
and press '''Enter'''
 +
 
 +
|-
 +
||The command terminal will show
 +
the conversion
 +
 
 +
||On the '''terminal''' you will see that the '''mesh file''' is converted to '''openfoam data file'''
 +
 
 +
|-
 +
||Click on cylinder folder
 +
 
 +
||Now go back to the '''cylinder''' folder
 +
 
 +
|-
 +
||Point to the constant folder
 +
 
 +
Click on constant folder
 +
 
 +
||The '''constant''' folder has been generated
 +
 
 +
Click on the '''constant''' folder to open it.
 +
 
 +
|-
 +
||Point showing no transport property file.
 +
 
 +
||'''Transport Property''' file is missing from the '''constant''' folder
 +
 
 +
|-
 +
||constant >> cylinder >> cavity >>
 +
constant – copy the transport
 +
property file
 +
 
 +
||Go two levels back and copy the '''transport property''' from the '''constant folder''' of the '''cavity case'''.
 +
 
 +
|-
 +
||Paste inside the constant folder of cylinder  >> do not change the viscosity
 +
 
 +
||Paste it inside the '''constant''' folder of '''cylinder''' which we created just now.
 +
 
 +
We will keep the default '''viscosity'''.
 +
 
 +
|-
 +
||Command Terminal
 +
 
 +
||Switch back to the '''terminal'''.
 +
 
 +
|-
 +
||Do not run '''blockMesh''' command
 +
 
 +
||'''Note that''' we do not run '''blockMesh''' command here.
 +
 
 +
|-
 +
||Boundary conditions in the mesh file
 +
 
 +
||To view the '''boundary conditions''' in the '''mesh''' file
 +
 
 +
|-
 +
||From the command terminal go to the boudary file
 +
 
 +
||Go to '''Constant > polyMesh'''.
 +
 
 +
Type '''ls'''.
 +
 
 +
You will see the '''boundary''' file.
 +
 
 +
|-
 +
||Open the file in the text editor
 +
 
 +
||Open it in any '''editor''' of your choice.
 +
 
 +
|-
 +
||Names are same as sown in the geometry slide
 +
 
 +
||The '''boundary condition''' names are same as seen in the '''geometry''' slide.
 +
 
 +
|-
 +
||In case of boundary name error check this file
 +
 
 +
||In case of any error with the '''boundary names''', you can refer to  '''boundary file'''
 +
 
 +
|-
 +
||polyMesh >> constant >> 0 folder
 +
 
 +
||In the '''terminal''', go two levels back and go to the '''0''' folder.
 +
 
 +
|-
 +
||Open the ' p ' file
 +
 
 +
||Open the '''pressure file''' in the '''0 folder'''.
 +
 
 +
|-
 +
||Point over the boundary name and
 +
change it to the ones shown in the
 +
boundary file
 +
 
 +
||Note that the '''boundary''' names should exactly match with the '''boundary file'''.
 +
 
 +
Change them if needed.
 +
 
 +
Close this file.
 +
 
 +
|-
 +
||' p '>> 0 >> system folder
 +
 
 +
||Go one level back and go to the''' system '''folder.
 +
 
 +
|-
 +
||Open the '''controlDict''' file.
 +
 
 +
||Open the '''controlDict''' file.
 +
 
 +
 
 +
|-
 +
||Edit the '''control dict''' file
 +
 
 +
||We will change the end time of '''controlDict''' file.
 +
 
 +
Close this.
 +
 
 +
|-
 +
||
 +
 
 +
|| Go one level back.
 +
 
 +
|-
 +
||Type icoFoam and press enter
 +
 
 +
|| To start the '''iterations''', type '''icoFoam''' and press '''Enter'''
 +
 
 +
|-
 +
||Iterations running in terminal window
 +
 
 +
||'''Iterations''' running will be seen in the '''terminal'''.
 +
 
 +
|-
 +
||Open paraview
 +
 
 +
||To view the '''geometry''', type '''paraFoam''' and press '''Enter'''.
 +
 
 +
|-
 +
||Click on Apply button
 +
 
 +
||In the '''paraFoam window''', click on the '''Apply''' button in the '''object inspector''' menu.
 +
 
 +
|-
 +
||Point over the geometry
 +
 
 +
||You can see the '''geometry'''.
 +
 
 +
|-
 +
||Point over the solid color and
 +
change it to U
 +
 
 +
||In the '''Active variable control''' menu, change from '''solid color''' to '''U velocity'''
 +
 
 +
|-
 +
||Point over the velocity condition
 +
 
 +
||The initial '''velocity''' condition is seen here.
 +
 
 +
|-
 +
||Click on the play button of VCR
 +
controls
 +
 
 +
||Click on the '''play''' button of the '''VCR menu''' on the top right-hand side.
 +
 
 +
|-
 +
||Point over the geometry
 +
 
 +
||We can see the '''velocity contours''' with the passage of time.
 +
 
 +
|-
 +
||Close paraview
 +
 
 +
||Close the ''' paraview '''window.
 +
 
 +
|-
 +
||Slide :
 +
List of commands to import mesh
 +
files
 +
 
 +
||Here is a list of command to''' import geometry''' from other '''meshing software'''.
 +
* '''ANSYS : ansysMeshToFoam space <filename>'''
 +
*'''CFX : cfxToFoam space <filename>'''
 +
*'''IDEAS : ideasTofoam space <filename>'''
 +
*'''SALOME : ideasUnvToFoam space <filename>'''
 +
 
 +
This brings us to the end of the tutorial.
 +
 
 +
|-
 +
||Slide :
 +
 
 +
||As an '''assignment'''
 +
* Try importing the '''mesh''' file of circular cylinder.
 +
* '''Mesh''' file by the name '''circcyl.msh''' provided with this tutorial.
 +
* Solve it using the '''icoFoam solver'''.
 +
 
 +
|-
 +
||Slide : Summary
 +
 
 +
||In this tutorial we learnt :
 +
 
 +
*Importing geometry from other '''meshing''' software.
 +
 
 +
|-
 +
||Slide 11 :
 +
About Spoken tutorials
 +
 
 +
||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
 +
 
 +
|-
 +
||Slide 12:
 +
About Spoken tutorials
 +
 
 +
||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@spoken-tutorial.org
 +
 
 +
|-
 +
||Slide 13:
 +
Acknowledgement
 +
 
 +
||Spoken Tutorials are part of 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
 +
More information on the same is available at the following URL link
 +
http://spoken-tutorial.org/NMEICT-Intro
 +
 
 +
|-
 +
||About the contributor
 +
 
 +
||This is Rahul Joshi from IIT BOMBAY signing off.
 +
Thanks for joining
 +
 
 +
 
  
 
|-
 
|-
 
|}
 
|}

Latest revision as of 05:50, 23 December 2014

Visual Cue Narration
Slide 1 Hello and welcome to the spoken tutorial on Importing Mesh files in OpenFOAM
Slide 2 : Learning Objectives In this tutorial, you will learn to:
  • import Mesh files
  • from a meshing software
  • in OpenFOAM.
Slide 3: System Requirement To record this tutorial I am using
  • Linux Operating system Ubuntu version 12.04.
  • OpenFOAM version 2.1.1
  • ParaView version 3.12.0
Slide 4  : Pre-requisite As a pre-requisite, the user should know how to generate a Mesh in software like -

Gambit, Ansys ICEM , CFX, Salome etc.

Slide 5:
  • Using blockMesh, we can easily make simple geometries.
  • For example- box, pipe etc.
  • It is difficult to create complex geometries using blockMesh.
Slide 6:
  • But OpenFOAM supports importing mesh from third party meshing software.
  • There are commands available in OpenFOAM, to import these mesh files.
We will now learn to import these files.
Slide 7 : Geometry for the case 
Point over the square cylinder
point over its length and height
point on inlet velocity


Here is the geometry of our case.

We have a square cylinder

  • length 1m and height 1m.
  • Inlet velocity is 1 m/s
  • We are solving this for a Reynolds Number (Re) = 100
  • The domain chosen is 40m by 60m
  • The Boundary conditions are as shown in the diagram
Slide 8 : This is the mesh file generated in a meshing software.
Go to the OpenFOAM > xyz-

2.1.1>run>tutorials>incompressible >icoFoam

In your OpenFOAM working directory, go to the icoFoam solver and click on it.
Create a folder : cylinder Create a folder by the name cylinder
Type cd (space) .. Now go to the cavity case.
Copy 0 and system folder from

cavity folder in icoFoam

Copy the 0 and system folders from the cavity case.
Paste it in cylinder folder Paste it inside the cylinder folder.
No constant folder Note that, you do not need the constant folder.
Point over the .msh file on the desktop On my desktop, I have a Fluent mesh file with a .(dot) msh extension.

It is named as cylmesh.msh

Copy-and-paste >> cylinder folder. Copy-and-paste this file in the cylinder folder in icoFoam.


Our setup is now ready.

Ctrl+Alt+t keys simultaneously Open the command terminal.
In the terminal window >> type run >> press Enter. Type run and press Enter.
Type cd tutorials; press Enter.
Type incompressible and press

Enter

Type cd incompressible; press Enter
Type icoFoam and press Enter Type cd icoFoam; press Enter
Type cylinder and press Enter Type cd cylinder and press Enter.
On the terminal >> type fluentMeshToFoam cylmesh.msh

>>Enter

For a Fluent mesh file, in the command terminal we need to type

fluentMeshToFoam (space) cylmesh.msh

and press Enter

The command terminal will show

the conversion

On the terminal you will see that the mesh file is converted to openfoam data file
Click on cylinder folder Now go back to the cylinder folder
Point to the constant folder

Click on constant folder

The constant folder has been generated

Click on the constant folder to open it.

Point showing no transport property file. Transport Property file is missing from the constant folder
constant >> cylinder >> cavity >>

constant – copy the transport property file

Go two levels back and copy the transport property from the constant folder of the cavity case.
Paste inside the constant folder of cylinder >> do not change the viscosity Paste it inside the constant folder of cylinder which we created just now.

We will keep the default viscosity.

Command Terminal Switch back to the terminal.
Do not run blockMesh command Note that we do not run blockMesh command here.
Boundary conditions in the mesh file To view the boundary conditions in the mesh file
From the command terminal go to the boudary file Go to Constant > polyMesh.

Type ls.

You will see the boundary file.

Open the file in the text editor Open it in any editor of your choice.
Names are same as sown in the geometry slide The boundary condition names are same as seen in the geometry slide.
In case of boundary name error check this file In case of any error with the boundary names, you can refer to boundary file
polyMesh >> constant >> 0 folder In the terminal, go two levels back and go to the 0 folder.
Open the ' p ' file Open the pressure file in the 0 folder.
Point over the boundary name and

change it to the ones shown in the boundary file

Note that the boundary names should exactly match with the boundary file.

Change them if needed.

Close this file.

' p '>> 0 >> system folder Go one level back and go to the system folder.
Open the controlDict file. Open the controlDict file.


Edit the control dict file We will change the end time of controlDict file.

Close this.

Go one level back.
Type icoFoam and press enter To start the iterations, type icoFoam and press Enter
Iterations running in terminal window Iterations running will be seen in the terminal.
Open paraview To view the geometry, type paraFoam and press Enter.
Click on Apply button In the paraFoam window, click on the Apply button in the object inspector menu.
Point over the geometry You can see the geometry.
Point over the solid color and

change it to U

In the Active variable control menu, change from solid color to U velocity
Point over the velocity condition The initial velocity condition is seen here.
Click on the play button of VCR

controls

Click on the play button of the VCR menu on the top right-hand side.
Point over the geometry We can see the velocity contours with the passage of time.
Close paraview Close the paraview window.
Slide :

List of commands to import mesh files

Here is a list of command to import geometry from other meshing software.
  • ANSYS : ansysMeshToFoam space <filename>
  • CFX : cfxToFoam space <filename>
  • IDEAS : ideasTofoam space <filename>
  • SALOME : ideasUnvToFoam space <filename>

This brings us to the end of the tutorial.

Slide : As an assignment
  • Try importing the mesh file of circular cylinder.
  • Mesh file by the name circcyl.msh provided with this tutorial.
  • Solve it using the icoFoam solver.
Slide : Summary In this tutorial we learnt :
  • Importing geometry from other meshing software.
Slide 11 :

About Spoken tutorials

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

Slide 12:

About Spoken tutorials

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@spoken-tutorial.org

Slide 13:

Acknowledgement

Spoken Tutorials are part of 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 More information on the same is available at the following URL link 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

Nancyvarkey, Rahuljoshi

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