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Old   April 6, 2010, 17:41
Default Ship Drag Calculation
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Francisco Miguel
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Hello all,

I am new to openFoam, and I am trying to solve the ship moving with free surface problem using InterFoam (with OpenFoam 1.5). In order to compute the drag the force function (which for some reason I haven't been able to make work anyway-any examples available?) will compute the whole pressures around the hull, rather than only the pressures on the submerged portion. I was thinking of a simple approach of computing the Forces by integrating this expression:

pressure*gamma*facearea*facenormal

However, in Paraview I haven't been able to do this. Am I missing something?

Otherwise, can it be done easily with a script after the computing is finished?

I will appreciate any help and welcome any other simple approach to the problem.

Regards,

Francisco
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Old   April 7, 2010, 09:21
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Cean
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There is a calculator in ParaView. Maybe it can help.
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Old   April 7, 2010, 09:35
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Francisco Miguel
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Yes, that was what I was trying to do, however, I found no way to acces the face normal in ParaView. Is it possible?
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