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-   -   How should we calculate the drag force ?? (http://www.cfd-online.com/Forums/fluent/48124-how-should-we-calculate-drag-force.html)

Thinnapong May 3, 2008 00:40

How should we calculate the drag force ??
 
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 ???

Zhengwei Long May 3, 2008 09:20

Re: How should we calculate the drag force ??
 
using UDF?

Trinnapong May 3, 2008 12:51

Re: How should we calculate the drag force ??
 
It have another way ?? because I'm not familiars for UDF !!

m@rk@s May 4, 2008 07:38

Re: How should we calculate the drag force ??
 
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.


Trinnapong May 4, 2008 09:21

Re: How should we calculate the drag force ??
 
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 ???

m@rk@s May 4, 2008 13:46

Re: How should we calculate the drag force ??
 
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.



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