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Drag over Ahmed body

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Old   May 18, 2009, 09:44
Default Drag over Ahmed body
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Shamoon Jamshed
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Hi all

I am simulating flow over Ahmed body in 2D. I want to calculate four drags front nose , the drag at the slant surface the back, the back drag and the total drag.

I want to ask that do I need to specify different reference area (or depth , I am not sure) for each of the drag values.

If yes, what reference area should I take. Remember that I am doing 2D!

N.B The values are not comparable with the standard graph of Drag coeffcients available for Ahmed body at different back angles!

Regards
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Old   May 18, 2009, 12:02
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Ralf Schmidt
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Hi!

check this out:

lift coefficent of ahmed body

For drag coefficient calculation, have a look inside the Fluent manual, how the area in 2D is calculated.

As far as I know, you have to set the reference area different for every value...

Just set different values and compute the coefficients... and you will see the influence...

Ralf
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Old   May 18, 2009, 14:15
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Shamoon Jamshed
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Well the mesh is structures. All the results, vel profile, stream lines are correct. The only problem is the area. In 2D I dont know how to specify the area for each individual wall!

Fluent manual didnot help
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