help! kOmega SST SAS always using RANS?

kingjewel1 · March 16, 2016, 08:51

Dear all,

I'm trying to simulate flow over 9 surface mounted cubes at Re:4e5

One cube has 2 windows so it's definitely an unsteady problem

My deltaT is 1-e4.What is the recommended yplus?

But also it looks like it's always using RANS rather than LES for vortex shedding so looks averaged out. What am I doing wrong?

Pics: https://onedrive.live.com/redir?resi...nt=photo%2cpng

Mesh: https://onedrive.live.com/redir?resi...nt=photo%2cpng

A full executable case is here: https://onedrive.live.com/redir?resi...hint=folder%2c

lukas.lebo · April 14, 2017, 08:13

Did you ever find out how to set up the kOmega SST SAS Case properly? If yes could you provide an example?

Chief-CeTe · March 13, 2018, 03:46

Hi,

in my SAS cases, one problem was often that the omega equation initial residual was so low that the omega equation was not iterated at all. Using minIter for omega in the fvSolution solved the problem and I got rid of the Rans-like behavior.

Hope it helps,
Cete

March 16, 2016, 08:51	help! kOmega SST SAS always using RANS?	#1
kingjewel1 Senior Member Join Date: Jul 2009 Posts: 260 Rep Power: 17	Dear all, I'm trying to simulate flow over 9 surface mounted cubes at Re:4e5 One cube has 2 windows so it's definitely an unsteady problem My deltaT is 1-e4.What is the recommended yplus? But also it looks like it's always using RANS rather than LES for vortex shedding so looks averaged out. What am I doing wrong? Pics: https://onedrive.live.com/redir?resi...nt=photo%2cpng Mesh: https://onedrive.live.com/redir?resi...nt=photo%2cpng A full executable case is here: https://onedrive.live.com/redir?resi...hint=folder%2c

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April 14, 2017, 08:13		#2
lukas.lebo New Member Lukas Lebovitz Join Date: Mar 2017 Location: Zürich, Switzerland Posts: 25 Rep Power: 9	Did you ever find out how to set up the kOmega SST SAS Case properly? If yes could you provide an example?

March 13, 2018, 03:46		#3
Chief-CeTe New Member Thorben Schröder Join Date: Feb 2016 Posts: 2 Rep Power: 0	Hi, in my SAS cases, one problem was often that the omega equation initial residual was so low that the omega equation was not iterated at all. Using minIter for omega in the fvSolution solved the problem and I got rid of the Rans-like behavior. Hope it helps, Cete