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Old   April 18, 2002, 15:48
Default Lift
  #1
Paul
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Dear All,

I'm working in calculation of external aerodynamics of automotiobiles. The main problem i have is, that the drag is brilliant but the lift is very poor. Im using k epsilon model. Are there any basic things i have to take care about. The surfacemesh is fine enough and quality is good. 5 boundary layers are used.
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Old   April 18, 2002, 22:20
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Joern Beilke
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Run it transient.
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Old   April 19, 2002, 18:54
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paul 2
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Lift is probably the toughest aerodynamic coefficient to predict. Deciding what goes up and over and what goes down and under is not easy.

Make sure the y+ on the surface is within what k-e wants - 30 to 300??? And it would probably be better if the y+ was consistant over the entire surface of the vehicle. More cells between the bottom of the car/vehicle and the floor will also help.
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Old   April 20, 2002, 07:17
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Paul
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This is what i thought about too, Do you have any experiences about the time scales? What timestep is common for such problems?
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Old   April 20, 2002, 07:22
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Paul
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Do you have any experiences in using other turbulence models. I saw in Auto Technology Fluent is doing it with a Reynolds Stress Model. What do you think about that
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Old   April 22, 2002, 06:52
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Holidays
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Try the SST model of Menter or a k-omega model...
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