Sampling Reynolds Stresses

sven · July 8, 2009, 12:00

I ran a turbulent channel flow calculation and now I want to sample the obtained Reynolds Stress Tensor R with the post processing sample tool. However the tool does not work if I put a capital R (for Reynolds Stresses) in the fields part of the sampledict file:

Code:

fields
(
     U
     R
);

Has anyone succeded in doing this? What do I have to do to apply the samples tool on R? Thanks a lot

fs82 · July 10, 2009, 05:42

Try to sample UPrime2Mean instead of R.

leonardo.morita · July 10, 2009, 08:42

I had problems with sampling UPrime2Mean too and I was suggested to firstly get UPrime2Mean components (foamCalc components UPrime2Mean) and then apply sample to each component separately.

fs82 · July 13, 2009, 07:45

The UprimeToMean field is a symmetric tensor field and this fieldtype is really tricky. The foamToTecplot converter ignores it too. But with the foamCalc you can split the symmetric tensor field into its componets UprimeToMeanxx, UprimeToMeanyy, UprimeToMeanzz ... This should work :-D

salahudeen · March 1, 2012, 17:15

sir , whether uprime2mean and reynolds stress is same??

July 8, 2009, 12:00	Sampling Reynolds Stresses	#1
sven Member Sven Winkler Join Date: May 2009 Posts: 70 Rep Power: 17	I ran a turbulent channel flow calculation and now I want to sample the obtained Reynolds Stress Tensor R with the post processing sample tool. However the tool does not work if I put a capital R (for Reynolds Stresses) in the fields part of the sampledict file: Code: fields ( U R ); Has anyone succeded in doing this? What do I have to do to apply the samples tool on R? Thanks a lot

March 1, 2012, 17:15	reynolds stress	#5
salahudeen New Member salahudeen Join Date: Jun 2011 Posts: 3 Rep Power: 15	sir , whether uprime2mean and reynolds stress is same??

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Scaling the Reynolds stresses via UDF	Markus	FLUENT	1	November 11, 2022 13:44
what are reynolds stresses	UnderGroundMan	Siemens	12	November 11, 2008 14:12
what are reynolds stresses	UnderGroundMan	CFX	2	November 10, 2008 13:31
Reynolds stresses without velocity correlations?	Phil	Main CFD Forum	1	October 2, 2006 05:29
Reynolds stresses and second law	JF	Main CFD Forum	6	June 2, 2005 23:57

July 10, 2009, 05:42		#2
fs82 Senior Member Dr. Fabian Schlegel Join Date: Apr 2009 Location: Dresden, Germany Posts: 222 Rep Power: 18	Try to sample UPrime2Mean instead of R.

July 10, 2009, 08:42		#3
leonardo.morita Member Leonardo Giampani Morita Join Date: Apr 2009 Location: Paris, France Posts: 58 Rep Power: 17	I had problems with sampling UPrime2Mean too and I was suggested to firstly get UPrime2Mean components (foamCalc components UPrime2Mean) and then apply sample to each component separately.

July 13, 2009, 07:45		#4
fs82 Senior Member Dr. Fabian Schlegel Join Date: Apr 2009 Location: Dresden, Germany Posts: 222 Rep Power: 18	The UprimeToMean field is a symmetric tensor field and this fieldtype is really tricky. The foamToTecplot converter ignores it too. But with the foamCalc you can split the symmetric tensor field into its componets UprimeToMeanxx, UprimeToMeanyy, UprimeToMeanzz ... This should work :-D