|July 17, 2006, 04:39||
Hi, I have a channel with a
I have a channel with a incompresible flow and high Re number, stedy state. I run my case in a slightly modified version of the simpleFoam application. I want to try the two Reynold stress based turb. models LRR and LaunderGibsonRSTM. I use the following values for R()() in at the internal ande inlet patches of the channel.
inlet & internal
R=[0.564 0 0 0 0.564 0 0 0 0.564];
which is the same as 2*k/3 in my case.
The ploblem is that my time step continuity error blows upp pretty quickly and the calculated value of epsilon follows.
With other turbulence models I experiance many itterations for pressure (500) but the outcome looks nice.
Does anyone have a sugestion on how to avoid the blow upp using Reynold stress based turbulence models?
|July 25, 2009, 11:22||
Join Date: Jun 2009
Posts: 20Rep Power: 9
I am experiencing a similar problem here. Any idea how to get rid of the problem?? Did you find the solution to the problem??
|November 24, 2009, 15:09||
Join Date: Jun 2009
Posts: 38Rep Power: 9
Hi Erik and Barath
Did you try to use a k-epsilon calculation as initial condition for the RSTM run?
I have good experiences with precalc with an EVM, create the Reynolds-Stress-Tensor with post-processing tool 'R' and than switch to the RSTM. Be aware that the 'R' tool generates good values for the internal field but mixes up the boundaries! Therefore you have to correct the boundary field after operating 'R'.
I hope these information are still helpful. But perhaps you already figured out a way to fix your problems. In that case I would be happy to hear your oppinion about OpenFOAMs RSTMs. Dis they perform satisfactorily? Any further problems?
Thanks pretty much
|November 30, 2009, 16:32||
Join Date: Mar 2009
Location: Providence, RI
Posts: 18Rep Power: 9
Relaxing R also helps a lot
i.e. add the following to your fvSolutions
|Thread||Thread Starter||Forum||Replies||Last Post|
|Problem initializing Reynolds stress turbulence||Vinicius||CD-adapco||0||January 29, 2009 07:03|
|Turbulence: Reynolds stress equations||kharicha||FLUENT||0||March 16, 2006 09:50|
|Turbulence: Reynolds stress equations||kharicha||Main CFD Forum||0||March 16, 2006 09:48|
|reynolds stress in k-e model||ayapan||FLUENT||3||December 23, 2005 14:49|
|Reynolds stress Model||Chimenti Martín||Main CFD Forum||5||November 21, 2001 14:22|