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 October 25, 2013, 09:20 hi..how to get right answer about drag measurment? #1 New Member   saeed Join Date: Feb 2013 Posts: 19 Rep Power: 5 im trying to do an exprimental work and then simulate that in CFX and too calculate the drag using formulas MYSELF next to result from CFX.which method i have to use to reach drag(for a submarine model.DARPA SUBOFF).I DONT HAVE ANY INFORMATION about the value of Cd in formula.

 October 26, 2013, 06:51 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,721 Rep Power: 99 The equation for Cd is described in any basic fluid mechanics textbook. Even a google search would find that one.

 October 27, 2013, 08:57 thanks alot but #3 New Member   saeed Join Date: Feb 2013 Posts: 19 Rep Power: 5 what do you mean by that.we have a formula that is F=1/2*Cd*ro*A*V^2 and i dont have Cd for a submarine model and i dont have F in this formula.pls help me completely.........................best regards

 October 27, 2013, 17:36 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,721 Rep Power: 99 Let me help you: http://en.wikipedia.org/wiki/Drag_coefficient

 October 28, 2013, 16:33 let tell my question simply..........:) #5 New Member   saeed Join Date: Feb 2013 Posts: 19 Rep Power: 5 i want information about drag coefficient for a suboff model..only its my question..information that are in wikipedia about mercedes ls and sphere and etc...THNAKS

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