OpenFOAM/C3/Using-Template-files-in-PyFoam/English-timed

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Time Narration
00:01 Hello and welcome to the spoken tutorial on Using Template files in PyFoam.
00:07 In this tutorial we will: Understand the function of PyFoam Utilities
00:13 Create and use template files
00:17 Use PyFoamFromTemplate dot py for solving the supersonic flow over wedge
00:24 We can run this for different wedge angles using template files.
00:29 To record this tutorial I am using Ubuntu Linux Operating System 14.04
00:36 OpenFOAM 2.3.0

PyFoam-0.6.5

00:42 To practice this tutorial the user should have : Basic Knowledge of using Linux terminal
00:49 Experience of running and analyzing OpenFOAM cases
00:54 If not, please refer to the spoken tutorial series on Linux and OpenFOAM.
01:00 What are template files?
01:03 Template files are used to generate OpenFOAM files like blockMeshDict or controlDict
01:10 Template files can be programmed, hence we can procedurally generate data.
01:16 A template file should be an OpenFOAM file, with the following -
01:22 Any line beginning with $$ is a Python program line.
01:28 It will be executed by Python
01:31 Any variable can be substituted in the file by using the syntax vertical pipe dash variable name dash vertical pipe
01:42 The following steps should be followed to use a template file :
01:47 First copy an existing file
01:50 After this create a template file
01:54 Then run PyFoamFromTemplate dot py
01:58 Template file will be created for blockMeshDict.
02:02 We will use the supersonic flow over a wedge as an example case. The case file is available in the rhoCentralFoam solver.
02:12 Open the terminal. Type the path for the rhoCentralFoam inside compressible solvers.
02:22 Now copy the Wedge15Ma5 case directory into OpenFOAM directory by typing cp space minus r space Wedge15Ma5 space type the path of your OpenFOAM directory and press Enter.
02:46 On the terminal, type the path for Wedge15Ma5 folder inside OpenFOAM directory.
02:53 Type the path for blockMeshDict file inside polyMesh directory inside constant.
03:00 Open the blockMeshDict file in any editor of your choice.
03:06 We can see the vertices section.
03:09 We need to calculate the co-ordinates of the end points of the slope.
03:14 Based on the angle, change the following lines
03:19 Switch back to the terminal.
03:22 Copy your blockMeshDict file into a file called blockMeshDict dot template
03:29 Type the following- cp space minus r space blockMeshDict space blockMeshDict dot template
03:40 Open the blockMeshDict dot template file using gedit.
03:46 Add the following lines above convertToMeters.
03:51 Any line preceded with $$ (dollar dollar) is a Python line, and will be interpreted and executed by Python
04:02 Modify the vertices entry as
04:06 Python variables assigned in the template file, should be substituted at any location in the file.
04:14 To do so, use vertical pipe dash variable name dash vertical pipe in the file.
04:22 We can see the changes made into this file.
04:26 Now, let's create a blank file.
04:30 On the terminal, type gedit templateFileConst and press Enter.
04:40 Create a dummy entry inside it by typing dummy space 1.0 semicolon
04:48 A dummy entry is mandatory.
04:51 An external dict has to be provided with any constant that is to be used in the template file.
04:59 Save and close the file.
05:04 We have to run the template command now.
05:08 Type this command in terminal and press Enter
05:15 We can see that 2 new files are generated the blockMeshDict and a Python file is also generated.
05:24 Do not edit the Python file.
05:27 Open the blockMeshDict file by typing gedit space blockMeshDict and press Enter.
05:36 We had changed the wedge angle from 15 deg to 10 deg.
05:41 The end points of the slope have also changed.
05:45 We can now run the case file by executing the OpenFOAM commands

blockMesh, rhoCentralFoam, visualize the results using Paraview.

05:57 As an assignment, use the following wedge angles and run the template commands.
06:03 Let us summarize.
06:05 In this tutorial, we learnt about PyFoam Template Files
06:10 We also learnt to- Create and use template files and using the PyFoamFromTemplate dot py command
06:19 Please post your timed queries in this forum.
06:23 Please post your general queries on OpenFOAM in this forum.
06:28 The FOSSEE team coordinates the TBC project.
06:32 The Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India. For more details , visit this website.
06:41 This is Rahul Joshi from IIT Bombay signing off. Thanks for watching

Contributors and Content Editors

Pratik kamble