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Drag coeifficient over a cylinder

Posted Jul 25, 2010, 12:50 a.m. EDT 2 Replies

Peijun Tang
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Hi,

anyone know how to calculate the drag coeifficient by use the post-process mode in COMSOL.

which type of boundary integration I should use? I mean pressure, viscous forces or else.

I used the impressible N-S model.

Thank you!! Please help me.
2 Replies Last Post Dec 3, 2014, 7:13 a.m. EST
Danial Tz
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Posted: 1 decade ago Jul 25, 2010, 1:46 p.m. EDT
Just do an integration over reaction forces in the boundary.

F_D = int (-reacf(u_fluid))

to find drag force. The rest is easy.

Good luck
Danial
Just do an integration over reaction forces in the boundary. F_D = int (-reacf(u_fluid)) to find drag force. The rest is easy. Good luck Danial
Abraham Mansouri
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Posted: 10 years ago Dec 3, 2014, 7:13 a.m. EST
Im trying to estimate the drag force, I used the F_D = int (-reacf(u_fluid)) but I get the value zero?
can you pls comment ?
Im trying to estimate the drag force, I used the F_D = int (-reacf(u_fluid)) but I get the value zero? can you pls comment ?

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