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Flow around sphere using 2D axisymmetric

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Old   May 13, 2014, 11:27
Question Flow around sphere using 2D axisymmetric
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Thibault
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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!
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Old   May 13, 2014, 11:47
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Ali Jafarizade
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hi
i am not sure but i think yes you should multiply it by two.
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Old   May 14, 2014, 03:39
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Thanks for the answer, I would also think that I should double it. However, my results look more doubtful then.
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Old   May 15, 2014, 00:01
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Ali Jafarizade
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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
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Old   May 15, 2014, 04:33
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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?
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Old   May 15, 2014, 05:02
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Ali Jafarizade
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hi thibalt
i am not sure
but i think some thing else is wrong and you should make the drag double.
best regards
Ali
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Old   May 15, 2014, 05:05
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Ok thanks! I will try to figure it out!
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Old   May 15, 2014, 05:08
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good luck thibalt
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axisymmetric 2d fluent, drag, drag coefficient, flow, sphere

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