Flow around formula car
Im now analizing flow around formula car, especially on under the vehicle often called floor, undertray or underbody.
I got a result showing negative force（downforce）on floor and as a hole vehicle.
But the analisys was done with k-ε.
Turned on k-ω, then I got positive force as hole vehicle, almost 0 force on floor.
I can under stand flow separation occurs stronger on k-ε, then downforce will be decreased.
One model with k-ε shows similar downforce to experimantal data, but when with k-ω, shows lift force!
Another with k-ε shows too much excessive downforce, but with k-ω, shows similar to experimantal data.
All the surface under the body is meshed as prism layer, and others are tetra.
Is this a problem?
Or are there other problems?
I can't resolve this problem for a long time!
Please help me. Please.
the following reference may be useful.
which deals with car conceptual design using k-e model.
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