How to use EBRSM turbulence model in OpenFOAM? What are f and R files in 0 directory

Shyam Sundar J · March 21, 2025, 05:26

Hi Everyone,
I have started to learn about turbulence models and started running cases using other turbulence models.
When moving ahead I wanted to validate a experimental result using EBRSM turbulence model. However I couldn't find a way to implement the model.
I changed the RAS models to EBRSM in turbulence models and couldn't figure out what are 'f' and 'R' files in the '0' directory and how to calculate them.

When I tried to run with random values it ends up with stack trace error.
I searched the forum and couldn't find proper results to find a solution.
Can anyone please help me to understand about the model and help me implement it?

Thank you,
Shyam

Tobermory · March 22, 2025, 11:38

Did you not look at the code? R is the Re Stress tensor - see ReynoldsStress.H (https://www.openfoam.com/documentati...8H_source.html). f is the elliptic blending factor - see EBRSM.H (https://www.openfoam.com/documentati...8H_source.html). As for the values, I suggest you read up on the model first (eg the references at the top of the header files) before trying to use it. Good luck.

Shyam Sundar J · March 22, 2025, 12:05

Thank you for your reply Tobermory.
I'm new to OpenFOAM turbulence study and not familiar with reading codes yet but getting a hang a of it little by little.
Yes I am aware that the R is a Stress tensor and f is the elliptic bending factor. I was puzzled about how to calculate those values.
I have not read the reference that you mentioned here. I'll take a look at that, thanks for the suggestion.

By any chance if you have used the turbulence model in OpenFOAM, can you share the case files hers. That would be very helpful for me to learn.

Thank you,

March 21, 2025, 05:26	How to use EBRSM turbulence model in OpenFOAM? What are f and R files in 0 directory	#1
Shyam Sundar J New Member Shyam Sundar J Join Date: Apr 2024 Posts: 4 Rep Power: 3	Hi Everyone, I have started to learn about turbulence models and started running cases using other turbulence models. When moving ahead I wanted to validate a experimental result using EBRSM turbulence model. However I couldn't find a way to implement the model. I changed the RAS models to EBRSM in turbulence models and couldn't figure out what are 'f' and 'R' files in the '0' directory and how to calculate them. When I tried to run with random values it ends up with stack trace error. I searched the forum and couldn't find proper results to find a solution. Can anyone please help me to understand about the model and help me implement it? Thank you, Shyam

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New turbulence model in OpenFOAM 5 with porosity scalar	shinjanghosh	OpenFOAM Programming & Development	0	January 15, 2020 00:06
1.7.x Environment Variables on Linux 10.04	rasma	OpenFOAM Installation	9	July 30, 2010 04:43
critical error during installation of openfoam	Fabio88	OpenFOAM Installation	21	June 2, 2010 03:01
64bitrhel5 OF installation instructions	mirko	OpenFOAM Installation	2	August 12, 2008 18:07
Adventure of fisrst openfoam installation on Ubuntu 710	jussi	OpenFOAM Installation	0	April 24, 2008 14:25

March 22, 2025, 11:38		#2
Tobermory Senior Member Join Date: Apr 2020 Location: UK Posts: 825 Rep Power: 16	Did you not look at the code? R is the Re Stress tensor - see ReynoldsStress.H (https://www.openfoam.com/documentati...8H_source.html). f is the elliptic blending factor - see EBRSM.H (https://www.openfoam.com/documentati...8H_source.html). As for the values, I suggest you read up on the model first (eg the references at the top of the header files) before trying to use it. Good luck.

March 22, 2025, 12:05		#3
Shyam Sundar J New Member Shyam Sundar J Join Date: Apr 2024 Posts: 4 Rep Power: 3	Thank you for your reply Tobermory. I'm new to OpenFOAM turbulence study and not familiar with reading codes yet but getting a hang a of it little by little. Yes I am aware that the R is a Stress tensor and f is the elliptic bending factor. I was puzzled about how to calculate those values. I have not read the reference that you mentioned here. I'll take a look at that, thanks for the suggestion. By any chance if you have used the turbulence model in OpenFOAM, can you share the case files hers. That would be very helpful for me to learn. Thank you,