# drag coefficient computation on a porous jump???

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 July 17, 2006, 22:13 drag coefficient computation on a porous jump??? #1 Fabrice Guest   Posts: n/a Hi everybody, In my study case I've got a porous jump to model a perforated plate and I would like to compute the drag coefficient on it. The problem is that Fluent only calculates the drag coefficient on boundaries declared as a wall (not as a porous jumb). Any idea to solve this problem??? Many thanks, Fab.

 July 18, 2006, 04:10 Re: drag coefficient computation on a porous jump? #2 Vincent Guest   Posts: n/a You can calculate the total force on the porous jump by integrating the pressure difference over the surface. The best way to do this is by using custom field funcions. Use the reference values to convert the force to a coefficient.

 July 18, 2006, 08:27 Re: drag coefficient computation on a porous jump? #3 Fabrice Guest   Posts: n/a Hi Vincent, OK for the method, Thank you very much for your advice. Cheers, Fabrice.

 June 5, 2017, 04:39 #4 New Member   sofina Join Date: Jun 2017 Posts: 6 Rep Power: 2 Hi, may I ask a question ? How to integrat the pressure difference over the porous jump by using custom field funcions?

 June 5, 2017, 05:30 #5 Senior Member     Kal-El Join Date: Apr 2017 Location: Finland Posts: 115 Rep Power: 2 Don't overthink this problem. You can monitor pressure on both sides of the porous jump. Then you can calculate the pressure difference yourself.

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