# Flow around sphere using 2D axisymmetric

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 May 13, 2014, 11:27 Flow around sphere using 2D axisymmetric #1 New Member   Thibault Join Date: May 2014 Posts: 16 Rep Power: 4 Hi all, I have a small question using 2D axisymmetry. When simulating following problem in FLUENT, do I need to multiply the drag by factor 2 because I'm working with half a sphere? Or is the drag output from FLUENT already for a full sphere? Image of the problem: Thanks!

 May 13, 2014, 11:47 #2 New Member   Ali Jafarizade Join Date: May 2009 Posts: 22 Rep Power: 9 hi i am not sure but i think yes you should multiply it by two.

 May 14, 2014, 03:39 #3 New Member   Thibault Join Date: May 2014 Posts: 16 Rep Power: 4 Thanks for the answer, I would also think that I should double it. However, my results look more doubtful then.

 May 15, 2014, 00:01 #4 New Member   Ali Jafarizade Join Date: May 2009 Posts: 22 Rep Power: 9 hi thibalt did you check the reference values? what did you put for the reference area? it is important for making the drag doule or not. best regards ali

 May 15, 2014, 04:33 #5 New Member   Thibault Join Date: May 2014 Posts: 16 Rep Power: 4 Thank you jafarizade for your answer, I use the drag force from FLUENT and not the drag coefficient calculated by the software using the reference values. When I calculate Cd with the area of a full sphere, the solution matches experimental data. This seems weird since I did not double the drag data. So does this mean that the drag output is already for a full sphere?

 May 15, 2014, 05:02 #6 New Member   Ali Jafarizade Join Date: May 2009 Posts: 22 Rep Power: 9 hi thibalt i am not sure but i think some thing else is wrong and you should make the drag double. best regards Ali

 May 15, 2014, 05:05 #7 New Member   Thibault Join Date: May 2014 Posts: 16 Rep Power: 4 Ok thanks! I will try to figure it out!

 May 15, 2014, 05:08 #8 New Member   Ali Jafarizade Join Date: May 2009 Posts: 22 Rep Power: 9 good luck thibalt

 Tags axisymmetric 2d fluent, drag, drag coefficient, flow, sphere

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