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Forum: CFX

September 7, 2009, 20:53

Replies: 15

Drag coefficient & Lift coefficient??

Views: 7,541

Posted By ghorrocks

Oh yes, and you probably need a step function to...

Oh yes, and you probably need a step function to only integrate over the positive areas if you have not separated the front and back surfaces already. Otherwise the front surface will give a positive...

Forum: CFX

September 7, 2009, 08:30

Replies: 15

Drag coefficient & Lift coefficient??

Views: 7,541

Posted By ghorrocks

??? That's why you work out the projected area as...

??? That's why you work out the projected area as I describe above.

Forum: CFX

September 7, 2009, 07:38

Replies: 15

Drag coefficient & Lift coefficient??

Views: 7,541

Posted By ghorrocks

For most designs the projected area is known -...

For most designs the projected area is known - length * diameter for a cylinder, chord * span for a wing. I have never calculated the projected areas in CEL but it should be possible - you can do an...

Forum: CFX

September 6, 2009, 08:00

Replies: 15

Drag coefficient & Lift coefficient??

Views: 7,541

Posted By ghorrocks

My preferred way is to have a CEL expression...

My preferred way is to have a CEL expression which evaluates the area using a projected area, density and velocity using an averaging function (if it is not known beforehand) and a force_x/y/z...

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