OpenFOAM/C3/Using-Template-files-in-PyFoam/English
Tutorial 21: C2
Title : Using Template files in PyFoam Script : Anmol Sahoo, Rahul Joshi Narration : Rahul Joshi
Keywords : OpenFOAM, PyFoam, Python, Template, supersonic flow, wedge
Visual Cue | |
Show slide : Title | Hello and welcome to the spoken tutorial on Using Template files in PyFoam. |
Show Slide : Learning Objective | In this tutorial we will:
We can run this for different wedge angles using template files. |
Show Slide : System requirement | To record this tutorial I am using
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Show slide : Prerequisite | To practice this tutorial the user should have :
If not, please refer to the spoken tutorial series on Linux and OpenFOAM. |
Show slide : Template Files | What are template files?
Template files are used to generate OpenFOAM files like blockMeshDict or controlDict
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Show slide : Syntax of Template files | A template file should be an OpenFOAM file, with the following -
| -varname - | |
Show slide : Using a template file | The following steps should be followed to use a template file :
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Show slide : Creating a template file | Template file will be created for blockMeshDict.
We will use the supersonic flow over a wedge as an example case. The case file is available in the rhoCentralFoam solver. |
Type run/tutorials/compres sible/rhoCentralFoam | Open the terminal.
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Type
cp -r Wedge15Ma5 /home/fossee/OpenFOAM/ |
Now copy the Wedge15Ma5 case directory into OpenFOAM directory
by typing cp -r Wedge15Ma5 Type the path of your OpenFOAM directory and press Enter. |
Cd OpenFOAM/Wedge5 M15 | On the terminal, type the path for Wedge5M15 folder inside
OpenFOAM directory. |
Type cd constant/polyMesh/bl ockMeshDict | Type the path for blockMeshDict file inside polyMesh directory inside
constant. |
Type gedit blockMeshDict | Open the blockMeshDict file in any editor of your choice. |
Point to the vertices section | We can see the vertices section. |
Show slide : vertices to
be changed |
We need to calculate the co-ordinates of the end points of the slope.
Based on the angle, change the following lines ( 0.3048 0.081670913853 -0.005) ( 0.3048 0.081670913853 0.005) |
On the terminal type
cp -r blockMeshDict blockMeshDict.templ ate |
Switch back to the terminal
Copy your blockMeshDict file into a file called blockMeshDict.template, type the following- cp -r blockMeshDict > blockMeshDict.template |
gedit blockMeshDict.templat e | Open the blockMeshDict.template file using any editor |
Show slide : Template file syntax | Add the following lines above convertToMeters
$$thetaDegrees = 10.0 $$thetaRadians = math . radians ( thetaDegrees ) $$y_coord = 0.3048* math . tan ( thetaRadians )
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executed by Python | |
Show slide : Template file syntax | Modify the vertices entry as
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Python variables assigned in the template file, should be substituted at any location in the file.
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Highlight or point to the changes | We can see the changes made into this file. |
Now, let's create a blank file | |
Type gedit templateFileConst | On the terminal, type gedit templateFileConst and press Enter. |
templateFileConst | Create a dummy entry inside it by typing
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Press Ctrl+S and close | Save and close the both the files |
cd ../../ | Now go 2 levels back to your case file. |
Switch back to slides | Let me switch back to slides |
Show slide : Running PyFoam command | We have to run the template command now.
--output=./blockMeshDict --values-dictionary=templateFileConst --allow-exec-instead-of-assignment |
Type this command in terminal >> press Enter | Type this command in terminal and press Enter |
Type cd constant/polyMesh | Now again go inisde the polyMesh folder inside constant |
Point to blockMeshDict and a python file | We can see that
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Point to the Python
file. |
Do not edit the Python file. |
On the terminal type
gedit blockMeshDict |
In the terminal, open the blockMeshDict file by typing - |
gedit blockMeshDict and press Enter. | |
Point to wedge angle | We had changed the wedge angle from 15 deg to 10 deg. |
Point to end points | The end points of the slope have also changed. |
Show slide :Running the case file | We can now run the case file by executing the OpenFOAM commands
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Show slide : Assignment | As an assignment, use the following wedge angles and run the template
commands.
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Show slide : Summary | Let us summarize.
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Show Slide
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Please post your timed queries in this forum. |
Show Slide
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Please post your general queries on OpenFOAM in this forum. |
Show Slide Textbook Companion | The FOSSEE team coordinates the TBC project. |
Show Slide Acknowledgement | The Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India
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Thank You | This is Rahul Joshi from IIT Bombay signing off. Thanks for watching |