The value of C3 in k epsilon model

cryabroad · March 29, 2019, 07:55

Hello Foamers,

As is shown in the source code of the k epsilon model in openfoam (/src/TurbulenceModels/turbulenceModels/RAS/kEpsilon), there is a C3 coefficient implemented. In the Description section in the .H file, it is said that C3 has a default value of -0.33, but based on the constructor in the .C file, C3 is always initialized to be 0 if no such value is provided by the user. Which statement is correct?

Thanks,

Ruiyan

mAlletto · March 30, 2019, 15:19

C3 is used for compressible floss. See k-Epsilon model - C3

cryabroad · April 2, 2019, 05:33

Hi Michael,

I've viewed the thread you mentioned. I guess there's some misunderstandings in my part, I thought what the Description section in the .H file means is that it should be -0.33 no matter what (which is not consistent with the code)...my bad, kind of feeling stupid.

Anyway, thanks for answering and clarifying!

Ruiyan

March 29, 2019, 07:55	The value of C3 in k epsilon model	#1
cryabroad Senior Member Ruiyan Chen Join Date: Jul 2016 Location: Hangzhou, China Posts: 162 Rep Power: 9	Hello Foamers, As is shown in the source code of the k epsilon model in openfoam (/src/TurbulenceModels/turbulenceModels/RAS/kEpsilon), there is a C3 coefficient implemented. In the Description section in the .H file, it is said that C3 has a default value of -0.33, but based on the constructor in the .C file, C3 is always initialized to be 0 if no such value is provided by the user. Which statement is correct? Thanks, Ruiyan

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March 30, 2019, 15:19		#2
mAlletto Senior Member Michael Alletto Join Date: Jun 2018 Location: Bremen Posts: 615 Rep Power: 15	C3 is used for compressible floss. See k-Epsilon model - C3

April 2, 2019, 05:33		#3
cryabroad Senior Member Ruiyan Chen Join Date: Jul 2016 Location: Hangzhou, China Posts: 162 Rep Power: 9	Hi Michael, I've viewed the thread you mentioned. I guess there's some misunderstandings in my part, I thought what the Description section in the .H file means is that it should be -0.33 no matter what (which is not consistent with the code)...my bad, kind of feeling stupid. Anyway, thanks for answering and clarifying! Ruiyan