Menu

Discussion Forum

New Discussion
Filter

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Drag coeifficient over a cylinder

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

Peijun Tang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

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
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

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
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade 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 ?

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content