# Ahmed Body Simulation

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 July 9, 2009, 08:05 Ahmed Body Simulation #1 New Member   Pin Join Date: Jul 2009 Posts: 2 Rep Power: 0 Dear All, I am pretty fresh on CFD simulation. Currently I am doing a simulation on Ahmed Model with 25deg slant angel in Fluent. I am looking for the Drag Coefficient. According to the experiment results (SR Ahmed 1984), the pressure drag coefficient at the front part is around 0.02, the back part is around 0.08 and the slant surface is around 0.15. The Simulation was under following Setting: Hex Mesh with around 4 million cells Domain is 9.2(x) x 1.87(y) x 1.4(z) LES Viscous model BC: 40m/s inlet velocity Symmetry the sides and top of the domain “References Values” Area: 0.112m^2 Length: 0.288m Velocity: 40m/s Viscosity: 1.79 x 10^-5 I tried to record the “Cd” on x-direction for all surfaces from the Fluent function: Solve, Monitors, Force. However, the results of are really bad. The “Cd” of the front part = 0.3, back part = 0.1 and slant part = 0.05 I want to know how to get the results of pressure drag coefficient from Fluent? The equation of the Drag Coefficient is Cd = (drag force)/(0.5 * density * A * V^2) Thanks a lot on help! Nick

 March 26, 2010, 17:37 #2 Senior Member   Saima Join Date: Apr 2009 Location: Canada Posts: 140 Rep Power: 9 Hi, I am working on Ahmed Body, IS there anybody has material about it? Thanks in advance!!! Saima Last edited by Saima; March 28, 2010 at 21:38.

March 26, 2010, 17:37
#3
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Saima
Join Date: Apr 2009
Posts: 140
Rep Power: 9
Quote:
 Originally Posted by nick Dear All, I am pretty fresh on CFD simulation. Currently I am doing a simulation on Ahmed Model with 25deg slant angel in Fluent. I am looking for the Drag Coefficient. According to the experiment results (SR Ahmed 1984), the pressure drag coefficient at the front part is around 0.02, the back part is around 0.08 and the slant surface is around 0.15. The Simulation was under following Setting: Hex Mesh with around 4 million cells Domain is 9.2(x) x 1.87(y) x 1.4(z) LES Viscous model BC: 40m/s inlet velocity Symmetry the sides and top of the domain “References Values” Area: 0.112m^2 Length: 0.288m Velocity: 40m/s Viscosity: 1.79 x 10^-5 I tried to record the “Cd” on x-direction for all surfaces from the Fluent function: Solve, Monitors, Force. However, the results of are really bad. The “Cd” of the front part = 0.3, back part = 0.1 and slant part = 0.05 I want to know how to get the results of pressure drag coefficient from Fluent? The equation of the Drag Coefficient is Cd = (drag force)/(0.5 * density * A * V^2) Thanks a lot on help! Nick
Is there anybody has material about it.

Last edited by Saima; March 28, 2010 at 21:39.

 March 26, 2010, 18:23 #4 Senior Member     Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 12 Use GAMBIT! __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

 May 10, 2010, 10:40 #5 Senior Member   Saima Join Date: Apr 2009 Location: Canada Posts: 140 Rep Power: 9 I have completed AHmed Body 3D meshing I cant upload here because size is moore then 100KB, if somebody needs send me an email ill send it.

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