CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLOW-3D (http://www.cfd-online.com/Forums/flow-3d/)
-   -   Fluid Force _output (http://www.cfd-online.com/Forums/flow-3d/80494-fluid-force-_output.html)

jiko September 28, 2010 06:14

Fluid Force _output
 
Hi,
I am studying fluid force on the GMO for the two cases. Firstly the fluid force on fixed GMO while the incoming flow velocity is Vx. and in the second case the same x_velocity Vx is imposed on GMO in stationay fluid. Now I was expected that the GMO would undergo same output fluid force. but it seems this isnt the case. so I wonder wich one is correct.
Perhaps i need more clarification about the calculation of fluid forces for fixed and moving GMO.
Thanks for your time and understandings.
gko

MuxaB September 28, 2010 22:15

Quote:

Originally Posted by jiko (Post 276892)
Hi,
I am studying fluid force on the GMO for the two cases. Firstly the fluid force on fixed GMO while the incoming flow velocity is Vx. and in the second case the same x_velocity Vx is imposed on GMO in stationay fluid. Now I was expected that the GMO would undergo same output fluid force. but it seems this isnt the case. so I wonder wich one is correct.
Perhaps i need more clarification about the calculation of fluid forces for fixed and moving GMO.
Thanks for your time and understandings.
gko

Are you using a force window for the force calculation on the stationary component? There are known differences between force window output and GMO component force output. The later is more correct. Since version 9.4 you can ask for the total (pressure+viscous) force output on any component without using force windows and the results would be the same in this case.

jiko September 29, 2010 12:11

thanks
i didnt utilize the force window.


All times are GMT -4. The time now is 23:56.