Drag coefficient for rectangular

v_h_memar · April 27, 2010, 02:34

hi
I calculate rectangular drag coefficient in fluent (2D analysis) and the result was 0.69 but in some table it is 2.05 (2D shape) .
in any body here that say me what is the mistake ?

jack1980 · April 27, 2010, 13:15

Is that at the same Reynold's number? The cd will depend on Re. What is your Re?

v_h_memar · April 27, 2010, 13:33

I do not have Reynolds number for handbook, but I have a question:
Is the Reynolds number make high difference like this for drag coefficient ?
do you have another handbook for drag coefficient with Reynolds number ?

jack1980 · April 27, 2010, 13:47

I'm afraid it is likely to make a big difference. For example refer to:

http://www.aerospaceweb.org/question...cs/q0231.shtml

The cd of 2.05 should be correct for roughly Re = 1e4 to 1e6.

v_h_memar · April 27, 2010, 23:54

dear jack
after modify the mistake in my modeling, I approach to 2.95
this answer was better than last. I will check the other Reynolds and I can find the reason , I will post that.
thanks.
v.Memar

April 27, 2010, 02:34	Drag coefficient for rectangular	#1
v_h_memar New Member Vahid Memar Join Date: Dec 2009 Posts: 15 Rep Power: 5	hi I calculate rectangular drag coefficient in fluent (2D analysis) and the result was 0.69 but in some table it is 2.05 (2D shape) . in any body here that say me what is the mistake ?

April 27, 2010, 13:33	reynolds number	#3
v_h_memar New Member Vahid Memar Join Date: Dec 2009 Posts: 15 Rep Power: 5	I do not have Reynolds number for handbook, but I have a question: Is the Reynolds number make high difference like this for drag coefficient ? do you have another handbook for drag coefficient with Reynolds number ?

April 27, 2010, 13:47		#4
jack1980 Senior Member Jouke de Baar Join Date: Oct 2009 Posts: 122 Rep Power: 5	I'm afraid it is likely to make a big difference. For example refer to: http://www.aerospaceweb.org/question...cs/q0231.shtml The cd of 2.05 should be correct for roughly Re = 1e4 to 1e6. Last edited by jack1980; April 27, 2010 at 13:49. Reason: wrong url

April 27, 2010, 23:54	drag of square	#5
v_h_memar New Member Vahid Memar Join Date: Dec 2009 Posts: 15 Rep Power: 5	dear jack after modify the mistake in my modeling, I approach to 2.95 this answer was better than last. I will check the other Reynolds and I can find the reason , I will post that. thanks. v.Memar

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April 27, 2010, 13:15		#2
jack1980 Senior Member Jouke de Baar Join Date: Oct 2009 Posts: 122 Rep Power: 5	Is that at the same Reynold's number? The cd will depend on Re. What is your Re?

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