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Drag coefficient in ANSYS\Flotran

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Old   April 13, 2005, 18:40
Default Drag coefficient in ANSYS\Flotran
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Tamanoir
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Hello!

I am simulating flow over a cylinder and want to get drag coefficient at various reynolds numbers. I modelled 2-D cylinder by making a circular hole in a rectangle and applied no slip boundary condition over the spherical hole. Also I applied velocity inlet and pressure outlet boundary condition. Now the problem is I am getting drag coefficient with a deviation of 20-40% from the experimental results. For example, I am getting Cd = 0.6 at Re = 1000, which should be 1 according to experimental results. I used standard k-e turbulence model.

Please help.
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Old   April 13, 2005, 18:43
Default Re: Drag coefficient in ANSYS\Flotran
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Tamanoir
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I read all messages posted earlier.But I didn`t found the answer for this question.
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Old   April 14, 2005, 04:26
Default Re: Drag coefficient in ANSYS\Flotran
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phonewell
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maybe Cd=0.9~1.1 is a better choice.
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Old   April 16, 2005, 11:46
Default Re: Drag coefficient in ANSYS\Flotran
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Derrek
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What kind of convergence are you getting? PRES in particular? Also, check the mass balance in the pfl file. There should be a very small difference (if at all) between the inlet and outlet.

Cheers,

Derrek
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