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Old   November 24, 2017, 10:06
Default FLUENT Bad results
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Giacomo Dall'Olio
Join Date: Nov 2017
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Hi Guys,

I'm having a trouble finding drag forces over a motorbike.
I get a drag force of about 40 N which give me a Cd of about 0.07
This result is obviously wrong , the magnitude of Cd is usually around 0.5 in this case...
The case seems well scaled,
Mesh is ok ( not wrong enough to give such a bad result, i hope )
k-epsilon realizable
Residual of k,epsilon, continuity around 1e-02
Residuals of speeds aroun 1e-05
Energy below 1e-07
cd and cl almost constant after 1000 iter.

Where can i start to find the cause of my problems ?
I ' ll appreciate every tipe of aid.
Thanks a Lot
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