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tsi07 May 29, 2012 08:50

Drag & lift coefficients for a velocity inlet BC
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Hi everybody,

I have a circular wall with a velocity inlet boundary condition to input a particular velocity on it.

But now I need the drag (and the lift) coefficient.

Is anyone have an idea to take it or to calculate it ? I need to plot it.

I join a picture with stream lines to give an idea about the flow...
Thanks !!!

tsi07 May 30, 2012 06:05

Any idea ?

Otherwise, is someone have a method to calculate the Drag force ?
With a custom field function for example ??

shabbarraza2000 May 30, 2012 08:45

go to

Report>result reports>reports>forces

here u can calculate

or u can also monitor them

solve>monitor>Drag or life


tsi07 May 30, 2012 08:52

the boundary condition is a velocity inlet
Yes I know this way, but I change the boundary condition to a velocity inlet,
so there is no wall in the window to choose, and so I have to find an other way.

shabbarraza2000 May 30, 2012 08:59

hmmm ... no idea.

because for me, if their is no wall then their should be no drag of lift force.
try to generate two curves and take the pressure difference and calculate the coefficient manually

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