Changing k-e constants to functions

tstorm · August 18, 2009, 16:59

Hi all,

I'm working on a user-defined v2-f turbulence model for FLUENT (I know it has one, but I'm trying to make one with curvature correction.)

The model uses the standard k and e transport equations that the k-e model uses. The transport equations are the same, but the constants are different. In particular, the C_1e constant is different.

For the k-e model, C_1e = 1.44

For the v2f model, C_1e = 1.4*( 1 + .05*sqrt( k/v2 ) )

Does anyone know how to change the C_1e constant to a function?

Thanks in advance.

tstorm · August 19, 2009, 12:59

Ok, I figured out how to add an additional source term to the epsilon term (DEFINE - BOUNDARY CONDITIONS - FLUID - SOURCE TERMS). I coded my source term, added it as S_e in the epsilon transport equation, and set the C_1e and C_2e constants to 0 in the DEFINE - MODELS - VISCOUS menu.

Now I have another question. I can't figure out how to change C_1e and C_2e using text commands. Is that possible?

August 18, 2009, 16:59	Changing k-e constants to functions	#1
tstorm Member Join Date: Apr 2009 Posts: 78 Rep Power: 17	Hi all, I'm working on a user-defined v2-f turbulence model for FLUENT (I know it has one, but I'm trying to make one with curvature correction.) The model uses the standard k and e transport equations that the k-e model uses. The transport equations are the same, but the constants are different. In particular, the C_1e constant is different. For the k-e model, C_1e = 1.44 For the v2f model, C_1e = 1.4( 1 + .05sqrt( k/v2 ) ) Does anyone know how to change the C_1e constant to a function? Thanks in advance.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Correct values for constants k E in wall functions	jaswi	OpenFOAM Running, Solving & CFD	0	February 21, 2008 11:33
Wall functions	tutlhino	OpenFOAM Pre-Processing	0	July 2, 2007 05:04
changing model constants in k-e turbulence model	Sunil	CFX	3	October 3, 2006 12:12
User-Defined Functions	Boisson	FLUENT	2	January 18, 2002 22:09
N-S equations:divergence free functions?	D. Puigjaner	Main CFD Forum	1	July 27, 2000 12:43

August 19, 2009, 12:59		#2
tstorm Member Join Date: Apr 2009 Posts: 78 Rep Power: 17	Ok, I figured out how to add an additional source term to the epsilon term (DEFINE - BOUNDARY CONDITIONS - FLUID - SOURCE TERMS). I coded my source term, added it as S_e in the epsilon transport equation, and set the C_1e and C_2e constants to 0 in the DEFINE - MODELS - VISCOUS menu. Now I have another question. I can't figure out how to change C_1e and C_2e using text commands. Is that possible?