|February 9, 2010, 06:15||
Numerical Problems with Non-Linear RAS models
Join Date: Mar 2009
Location: Stuttgart, Germany
Posts: 77Rep Power: 9
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: 13Rep 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?
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