Automatic wall functions for kEpsilon model

fumiya · January 13, 2013, 07:27

Hi,

I would like to be able to properly calculate the turbulent flows using the
standard kEpsilon model regardless of y+ value. In the OpenFOAM
implementations, I understand that I have to use the mesh such that
y+>30 when using the high Re turbulence model.

What approach should I take to my aim?
Is there anybody who has experienced the implementations of the automatic
wall function in OpenFOAM?
I would like to listen to voice of experience.

I would welcome any comments and suggestions.

Thanks in advance,
Fumiya

sylvester · January 15, 2013, 09:36

Hi Fumiya,

It is my understanding that using nutUSpaldingWallFunction (for nut) will give you such a wall function. For k and epsilon you should keep the usual wall functions (i.e. kqRWallFunction and epsilonWallFunction, respectively).

regards,
Sylvester

fumiya · January 16, 2013, 10:28

Thank you very much for your reply, sylvester. I'll have a try.

By the way, I found the article related to this thread:
http://www.opensourcecfd.com/confere...9_Kurenkov.pdf

Is there anyone who has used or implemented the wall functions described in it?
Are they more robust than the wall functions implemented in OpenFOAM?

Best regards,
Fumiya

January 13, 2013, 07:27	Automatic wall functions for kEpsilon model	#1
fumiya Senior Member Fumiya Nozaki Join Date: Jun 2010 Location: Yokohama, Japan Posts: 266 Blog Entries: 1 Rep Power: 19	Hi, I would like to be able to properly calculate the turbulent flows using the standard kEpsilon model regardless of y+ value. In the OpenFOAM implementations, I understand that I have to use the mesh such that y+>30 when using the high Re turbulence model. What approach should I take to my aim? Is there anybody who has experienced the implementations of the automatic wall function in OpenFOAM? I would like to listen to voice of experience. I would welcome any comments and suggestions. Thanks in advance, Fumiya

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January 15, 2013, 09:36		#2
sylvester Member Roland Join Date: Mar 2009 Location: Netherlands Posts: 93 Rep Power: 17	Hi Fumiya, It is my understanding that using nutUSpaldingWallFunction (for nut) will give you such a wall function. For k and epsilon you should keep the usual wall functions (i.e. kqRWallFunction and epsilonWallFunction, respectively). regards, Sylvester

January 16, 2013, 10:28		#3
fumiya Senior Member Fumiya Nozaki Join Date: Jun 2010 Location: Yokohama, Japan Posts: 266 Blog Entries: 1 Rep Power: 19	Thank you very much for your reply, sylvester. I'll have a try. By the way, I found the article related to this thread: http://www.opensourcecfd.com/confere...9_Kurenkov.pdf Is there anyone who has used or implemented the wall functions described in it? Are they more robust than the wall functions implemented in OpenFOAM? Best regards, Fumiya