|February 9, 2010, 06:15||
Numerical Problems with Non-Linear RAS models
Join Date: Mar 2009
Location: Stuttgart, Germany
Posts: 77Rep Power: 8
I am trying to simulate the flow in a channel with periodic hills using a nonlinear RAS model and simpleFoam (incompressible).
The mesh is of good quality and I am using upwind schemes for all quantities apart from the non-linear stress term:
div(nonlinearStress) Gauss linear;
My problem is that I get massive oscillations in almost all flow quantities, see attached pictures!
I am quite sure that the oscillations are caused by using: div(nonlinearStress) Gauss linear;
Therefore, I have tried to use a limited version (e.g. div(nonlinearStress) Gauss limitedLinear 1; ) but this does not work.
Does anyone know how a bounded version of Gauss linear can be used on div(nonlinearStress)?
|August 18, 2015, 05:48||
Join Date: Jan 2013
Posts: 12Rep Power: 5
I have implemented several nonlinear models and I am facing exactly the same issue with all of them. Have you found a solution?
|Thread||Thread Starter||Forum||Replies||Last Post|
|Two-fluid models vs mixture models for bubbly flows||Hansong Tang||Main CFD Forum||6||December 8, 2009 04:21|
|unstructured grid||sreekanth||Main CFD Forum||1||August 6, 2001 15:09|
|liquid/solide phase change problems||mehdi fteity||Main CFD Forum||3||September 14, 2000 21:44|
|New Books and Numerical Software||Eleuterio TORO||Main CFD Forum||0||December 18, 1998 13:41|
|Problems of numerical instability because of high gradients||Xiangyang Ye||Main CFD Forum||4||September 28, 1998 03:48|