# How should we calculate the drag force ??

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 May 3, 2008, 00:40 How should we calculate the drag force ?? #1 Thinnapong Guest   Posts: n/a Hi All I have simplae question for the drag force calculation in Fluent, In Fluent can calculate drag coefficient but if we need drag force we should re calculate again right ???

 May 3, 2008, 09:20 Re: How should we calculate the drag force ?? #2 Zhengwei Long Guest   Posts: n/a using UDF?

 May 3, 2008, 12:51 Re: How should we calculate the drag force ?? #3 Trinnapong Guest   Posts: n/a It have another way ?? because I'm not familiars for UDF !!

 May 4, 2008, 07:38 Re: How should we calculate the drag force ?? #4 m@rk@s Guest   Posts: n/a If i am not wrong, you are talking about Drag on body in external flow. In Fluent, Drag and Lift forces are possible to get, Go to Report and then force. There you can select surface on which you want to get forces and given direction (very important). Just say print and it would give forces as pressure and viscous forces which is responsible for total drag forces.

 May 4, 2008, 09:21 Re: How should we calculate the drag force ?? #5 Trinnapong Guest   Posts: n/a Thank for your advice but my simulation is unsteady and need to see force acting on my body for each time step ??? have any more advice ???

 May 4, 2008, 13:46 Re: How should we calculate the drag force ?? #6 m@rk@s Guest   Posts: n/a If you want to know forces on body at each and every timestep, then you can set in Monitor that would give drag at each time step.