Hi everyone,

Does anyone knows whether there is an option in CFX-post to select so that we can find the drag coefficient for a fluid flow past a body?

Thanks in advance, Ken

I dont know of any direct way of doing this, however I sum the forces in the X direction on the body in question then use the equation Drag = 0.5 x Density x Velocity^2 x Plan Area x Cd

I have never found out the true accurcy of this but it has been good enough for my applications. It should give a good estimation though.

Steve

Hi Steve,

As you are using the definition of drag coefficient it is no estimation, it is a direct calculation of the coefficient. Any error you find then is caused by simulation inaccuracy.

Glenn Horrocks

please give me how to determine drag coeff. and pree coee. i need in my priject.

As Steven said in the second post.. use the drag coefficient formula. You can get the force from cfx-solver by doing 'Workspace>New Monitor> then force" and select the wall name that you want.

Cheers