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VAWT force difference between blades

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Old   November 13, 2013, 12:47
Default VAWT force difference between blades
benoit paillard
Join Date: Mar 2010
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Hi everyone,

I'm running a 2D simulation of a 2 blades VAWT. is set to 5. Turbulence model is k-omega SST, with y+ around 1.

When using a courant number around 50, the simulation runs fine and the forces and flowfield for both blades are identical.

With a courant below 5, the flow field and forces for the two blades are different. This behavior remains when pre-rotating the domain 180 (hence any mesh difference is ruled out). see movie attached.

This does not happen with other turbulence model.

Any hints on the origin of the difference would be appreciated !

I can transfer a minimal test case upon request.
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