Performance of k-omega in low Re flows

rvl565 · May 30, 2016, 20:43

Hi,

I have been simulating low Re flows ( ReTheta ~ 2500 ) over a ZPG flat plate. I saw that neither the k-omega nor the SST (in OpenFOAM) is able to give the correct log law profile nor the correct Cf. Has anyone seen this before? Are there any references that discuss this behaviour of the models?
I just wanted to check if I am doing something wrong!
I have tried the two different boundary conditions : the default wilcox omega boundary condition with the 6 *() and the one suggested by menter 60*() for both the models.

Thanks!

rvl565 · June 10, 2016, 04:53

my bad, somehow i didnt have the correct y+ :P

malv83 · June 17, 2016, 14:20

Are you using the fully turbulent models? because you should try transitional models. " Prediction of transitional and fully turbulent flow using an alternative to the laminar kinetic energy approach" is a very good transitional model

May 30, 2016, 20:43	Performance of k-omega in low Re flows	#1
rvl565 Member RacMat Join Date: Jan 2013 Posts: 78 Rep Power: 13	Hi, I have been simulating low Re flows ( ReTheta ~ 2500 ) over a ZPG flat plate. I saw that neither the k-omega nor the SST (in OpenFOAM) is able to give the correct log law profile nor the correct Cf. Has anyone seen this before? Are there any references that discuss this behaviour of the models? I just wanted to check if I am doing something wrong! I have tried the two different boundary conditions : the default wilcox omega boundary condition with the 6 () and the one suggested by menter 60() for both the models. Thanks!

June 17, 2016, 14:20	fully turbulent?	#3
malv83 Member Alberto Join Date: Sep 2013 Posts: 37 Rep Power: 13	Are you using the fully turbulent models? because you should try transitional models. " Prediction of transitional and fully turbulent flow using an alternative to the laminar kinetic energy approach" is a very good transitional model

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
low Mach compressible flows	venkataramana	OpenFOAM	9	February 22, 2019 05:52
how to calculate the omega at inlet boundary in k omega sst	Scabbard	OpenFOAM Running, Solving & CFD	2	September 30, 2014 14:06
problem from k epsilon to k omega	NJG	OpenFOAM Running, Solving & CFD	0	April 15, 2013 09:24
"Glitches" in k and omega	buffi	OpenFOAM Running, Solving & CFD	8	January 29, 2013 04:57
Low Re number flows	Wu Chun-Kai	Main CFD Forum	17	July 1, 1999 21:24

June 10, 2016, 04:53		#2
rvl565 Member RacMat Join Date: Jan 2013 Posts: 78 Rep Power: 13	my bad, somehow i didnt have the correct y+ :P