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lift and drag calculation

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Old   December 27, 2006, 18:11
Default lift and drag calculation
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actone
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hi, I'm simulating a flow around a foil and i have a trouble with my lift and drag calculation in CFX post, the two folowing expressions does not give the same value (for drag here):

with pressure: Cd=areaInt(Pressure*Normal X+Wall Shear*Normal X)@foil/(0.5*rho*U^2*S)=0.021

with force: Cd=sum(Force X)@foil/(0.5*rho*U^2*S)=0.028

CFX help say that function Force include viscous force but it does not seems to be ok...

Thank you in advance.

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