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Positive Lift force for a vehicle ?

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Old   January 20, 2015, 05:53
Default Positive Lift force for a vehicle ?
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mansouri is on a distinguished road
Hi there

I am getting positive drag and lift force for a 2D car body, I expected the lift force to be negative ? for instance at 70 m/s I get 1690 N for both lift and drag

should not the lift be negative ? what can be wrong ?

Thank you
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Old   January 20, 2015, 07:58
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It can be possible depending on the shape of the car. Typically you can have a high velocity-low pressure zone just above the roof of the car that result in a positive lift.
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lift and drag, lift coefficient

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