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problem: external aerodynamics-car

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Old   November 6, 2007, 10:50
Default problem: external aerodynamics-car
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vivek.k.yakkundi
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Anybody please. I am using fluent for analysis of car external aerodynamics.However fluent gives skin friction drag on the graphics. whether this drag is total drag ( pressure+skin friction ) or skin friction only.since car comes in the catagory of bluff bodies its major component should be pressure drag.if the read drag is only skin friction drag , how to find pressure drag & total drag. Also this application has unattached flow in the rear(separation) , do we apply boundary layer as in case of attached flows. help required. thanks.
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Old   November 7, 2007, 12:48
Default Re: problem: external aerodynamics-car
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yorgis
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In Fluent go to Report -> Force Report -> select the car geometry and click on print.

Fluent will give u the total force as well as the breakdown to viscous and pressure forces.

and yes, growing a boundary layer on the car surfaces and resolving the flow to the surface (rather than using wall functions) would be the way to go. By the way i find k-w sst rather usefull for external aerodynamics of bluff bodies.
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Old   November 8, 2007, 14:14
Default Re: problem: external aerodynamics-car
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vivek.k.yakkundi
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Thank you very much for the valuable information. with best Regards

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