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Old   March 20, 2012, 16:03
Unhappy Another High Drag coefficient question...Sorry
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gmd
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Hi all,

I'm using FLUENT to simulate vortex shedding from an NREL S809 wind turbine blade at angles of attack around 90degrees.

My flow conditions are highly turbulent (Re numbers around 2e6) and I am using the k-w SST model model. I am using time step size 0.05, with 500 steps, and 20 iterations/step.

My drag coefficient values are between 2.5 and 3.5, and my lift coefficients are both sides of 0 (they can't seem to decide if the airfoil is going up or down).

I am just wondering where I might be going wrong with this. My thoughts are that it is due to my meshing, and I am not sure what my y+ value is (don't quite know how to get it...I am relatively new to cfd)

Any help would be really really appreciated...my thesis is due on monday and I have been struggling with this for a while!

Many thanks!
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coefficient, drag, fluent 12, lift, vortex shedding

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