Ship Drag Calculation

Curro5150 · April 6, 2010, 17:41

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

shirazbj · April 7, 2010, 09:21

There is a calculator in ParaView. Maybe it can help.

Curro5150 · April 7, 2010, 09:35

Yes, that was what I was trying to do, however, I found no way to acces the face normal in ParaView. Is it possible?

April 6, 2010, 17:41	Ship Drag Calculation	#1
Curro5150 New Member Francisco Miguel Join Date: Apr 2010 Posts: 13 Rep Power: 16	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: pressuregammafacearea*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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April 7, 2010, 09:21		#2
shirazbj Senior Member Cean Join Date: Feb 2010 Posts: 128 Rep Power: 16	There is a calculator in ParaView. Maybe it can help.

April 7, 2010, 09:35		#3
Curro5150 New Member Francisco Miguel Join Date: Apr 2010 Posts: 13 Rep Power: 16	Yes, that was what I was trying to do, however, I found no way to acces the face normal in ParaView. Is it possible?