Drag & lift coefficients for a velocity inlet BC

tsi07 · May 29, 2012, 09:50

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, 07:05

Any idea ?

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

shabbarraza2000 · May 30, 2012, 09:45

go to

Report>result reports>reports>forces

here u can calculate

or u can also monitor them

solve>monitor>Drag or life

cheers

tsi07 · May 30, 2012, 09:52

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, 09:59

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

May 30, 2012, 09:52	the boundary condition is a velocity inlet	#4
tsi07 Member Join Date: Mar 2012 Location: USA Posts: 33 Rep Power: 14	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.

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May 30, 2012, 07:05		#2
tsi07 Member Join Date: Mar 2012 Location: USA Posts: 33 Rep Power: 14	Any idea ? Otherwise, is someone have a method to calculate the Drag force ? With a custom field function for example ??

May 30, 2012, 09:45		#3
shabbarraza2000 New Member rabbahs Join Date: Aug 2010 Posts: 11 Rep Power: 16	go to Report>result reports>reports>forces here u can calculate or u can also monitor them solve>monitor>Drag or life cheers

May 30, 2012, 09:59		#5
shabbarraza2000 New Member rabbahs Join Date: Aug 2010 Posts: 11 Rep Power: 16	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