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Lift Coefficient in fluent (reference value)

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Old   November 19, 2018, 05:57
Default Lift Coefficient in fluent (reference value)
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Yuk Tong Cheng
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For the fluent solver, it uses the force to deduce the coefficient, but what should be the Area i should set in reference value?

I am doing a car model, I get the downforce but the lift coefficient seems to be incorrect since i don't know the area (should I use surface area or cross sectional area?). is there any way to compute the coefficient directly?

Thank you!
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Old   November 19, 2018, 07:57
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Lucky Tran
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The reference area is defined in the definition of lift coefficient. Depending on who you are, what day of the week it is, and what time of day it is, the reference area chosen can be anything. If you don't know what the reference area ought to be, then there's no meaning to lift coefficient and you should probably shouldn't be looking at the lift coefficient in the first place. Why isn't the lift force sufficient? Is there a need to examine the lift coefficient?

However, the reference area is often the frontal cross-sectional area (which has nothing to do with lift but this makes the lift and drag coefficients consistent). A better area is the planform area (again a projected area but viewed from above). Both are used. Normally it is a cross-sectional area and not an actual surface area.
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