k not being convected

sabuj · May 26, 2017, 13:01

Dear all,

I am trying to simulate VAWT with pimpleDyMFoam on fe32 with k-epsilon turbulence model. But k is not being convected and keeps trailing the airfoils instead (image attached). Has anyone faced this problem before? Please help

Thanks,
LR

kanuk · May 27, 2017, 12:09

I have had the same problem before and did not have any luck in solving it unfortunately...

For what it's worth, I did notice that, for some reason, the Spalart-Allmaras turbulence model for fe32 does convect turbulent eddy viscosity downstream properly. Various other two-equations models (including k-w-SST) did not work for me though. Hopefully you can find your answers here!

louisgag · September 20, 2019, 10:32

Hi,
I had the same issue and I solved it by using

Code:

minIter    1;

on my turbulence residuals (k and omega in my case) in fvSolution.
The reason being that the initial residuals on the turbulence equations was already lower than my tolerance and the solver would consequently not solve it!

I got my solution from this post: Problem with SST-Model - strange behaviour

September 20, 2019, 10:32	possible solution:	#3
louisgag Senior Member Louis Gagnon Join Date: Mar 2009 Location: Stuttgart, Germany Posts: 338 Rep Power: 18	Hi, I had the same issue and I solved it by using Code: minIter 1; on my turbulence residuals (k and omega in my case) in fvSolution. The reason being that the initial residuals on the turbulence equations was already lower than my tolerance and the solver would consequently not solve it! I got my solution from this post: Problem with SST-Model - strange behaviour

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May 27, 2017, 12:09		#2
kanuk New Member Kanuk Join Date: Oct 2010 Posts: 28 Rep Power: 15	I have had the same problem before and did not have any luck in solving it unfortunately... For what it's worth, I did notice that, for some reason, the Spalart-Allmaras turbulence model for fe32 does convect turbulent eddy viscosity downstream properly. Various other two-equations models (including k-w-SST) did not work for me though. Hopefully you can find your answers here!