Ship Drag Calculation

Curro5150 · April 6, 2010, 18:41

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, 10:21

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

Curro5150 · April 7, 2010, 10:35

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, 18:41	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Calculation of Drag Coefficient manually	PRASHANT GHADGE	FLUENT	4	December 13, 2012 16:31
Drag Calculation... Code_Saturne? Or any other examples?	ArtyB	Main CFD Forum	1	January 10, 2010 19:18
Ship drag with fluent	jose	FLUENT	0	April 22, 2009 13:26
lift and drag calculation	actone	CFX	0	December 27, 2006 18:11
Warning 097-	AB	Siemens	6	November 15, 2004 05:41

April 7, 2010, 10:21		#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, 10:35		#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?