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Transient effects in stationary simulations

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Old   December 20, 2013, 07:26
Question Transient effects in stationary simulations
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Björn
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Hi

I'm trying to simulate a valve but I don't achieve convergence. It is a very simple model (comparable to a von Karmans street).

Star CCM
Stat.
RANS SST kw
Air
20-25m/s
good mesh and Boundary layers

I note a relationship when looking at the residuals and force monitor (force on walls).

You find both diagrams attached.

Can someone tell me if this actually is a transient effect and the reason why I'm not achieving convergence?

Cheers :-)
Attached Images
File Type: jpg Residuals.jpg (81.9 KB, 5 views)
File Type: jpg ForceOnWalls.JPG (79.0 KB, 3 views)
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