|January 20, 2011, 08:59||
a problem of valve simulation in openfoam
Join Date: May 2010
Posts: 44Rep Power: 8
I am now using the compressible Solver rhoSimpleFoam (steady state case) to simulate a valve.
But I always have the problem of the residuals oszillation, especially for the pressure. see the residual figure in attachment.
I have try to modify the relaxtionfactor for every variable, but it still has oszillation.
Is that possible that the problem was linked to my mesh? Because some boundary elements in my mesh is very small.
The whole case foleder can be found under the fokllowing link:
Thanks a lot!
|January 20, 2011, 15:10||
Join Date: Feb 2010
Location: Boulder, CO
Posts: 17Rep Power: 8
Hi there. I've had CFD simulations before (not in OF) in which the residuals would oscillate like yours...that doesn't specifically mean that your simulation has not converged. It depends on how OF is calculating the residuals. Are the residual calculations in OF normalized by the average first N iterations? This is something to investigate...
Have you checked other measures for convergence? Such as mass flow rate in - mass flow rate out? Does this value oscillate too?
|January 21, 2011, 21:08||
Guilherme da Silva
Join Date: Aug 2010
Location: Sao Paulo - Brazil
Posts: 104Rep Power: 7
I agree with fletc900.
what are your results for x,y,z forces or moments?
are they converged?
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