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Old   February 25, 2008, 00:13
Default Finding drag coefficient in CFX
  #1
Ken
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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
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Old   February 25, 2008, 05:02
Default Re: Finding drag coefficient in CFX
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Steven
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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
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Old   February 25, 2008, 16:44
Default Re: Finding drag coefficient in CFX
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Glenn Horrocks
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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
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Old   March 12, 2008, 10:57
Default Finding drag coefficient in CFX
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avneesh
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please give me how to determine drag coeff. and pree coee. i need in my priject.
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Old   March 12, 2008, 20:10
Default Re: Finding drag coefficient in CFX
  #5
Maga
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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
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