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Ahmed body: questions about reference area and forces

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Old   October 18, 2016, 04:37
Default Ahmed body: questions about reference area and forces
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Sandyy
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I am simulating Ahmed body and am confused whether for calculating the coefficient of drag ,i should use the frontal area or the whole area of the Ahmed body.

Am refering to the motorbike tutorial ,there the whole area of the bike is 12.1486 calculated from paraview,but the Aref is taken to be 0.75.

Can anyone please suggest.
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Old   October 18, 2016, 05:06
Default Ahmed body: questions about reference area and forces
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How Aref is calculated in Ahmed body in Openfoam ?
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Old   October 18, 2016, 06:23
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In "forceCoeffs" you define your area for the calculation of drag, for example:

"AreaRef 0.03141;"
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Old   October 21, 2016, 09:18
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hi,can you please tell me, In Openfoam for the Ahmed body we are giving the Aref as 0.112 ,can you please suggest whether the Openfoam is taking the same area for calculating the lift coefficient ? Since the area which i have mentioned is the projected area in the X direction and we are not taking Aref in the y direction nowhere in Openfoam
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Old   October 30, 2016, 09:50
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Quick request @sandyy235: Please provide more details on how you are setting up these parameters.
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