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Cd and Ca coefficient with CFX

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Old   October 30, 2008, 12:03
Default Cd and Ca coefficient with CFX
  #1
Adenlan
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Hi,

I'm trying to compute the drag coefficient and the added mass coefficient with CFX but I have some issues with the values I shall take.

For the drag coefficient I'm using Force_X@body but to get the Cd coeffcient which value of velocity and area should I take ?

What is the methodology to get the Ca ?

Thank you for your help
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Old   October 30, 2008, 20:07
Default Re: Cd and Ca coefficient with CFX
  #2
Glenn Horrocks
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Hi,

What is Ca?

Cd is referenced to a sensible velocity. For something like external aerodynamics of a wing or a car it is usually the far-field velocity.

Glenn Horrocks
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Old   October 31, 2008, 03:47
Default Re: Cd and Ca coefficient with CFX
  #3
Adenlan
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Ca is the added mass coefficient
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Old   October 31, 2008, 10:17
Default Re: Cd and Ca coefficient with CFX
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Adenlan
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nobody knows about the added mass coefficient. I heard you can use an oscillating flow but i don't know how to set it up. Thank you for your answers
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