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Old   July 1, 2007, 15:37
Default Flow over a cylinder
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taran
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Hi all I plotted the xy plot for Cp for a 2d cylinder at a low reynolds number of 500 with laminar flow model .the plot of Cp is not coming symmetrical for both the upper and lower surfaces while it should come exactly symmetrical .Please explain this anamoly in my plot?
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Old   July 1, 2007, 17:20
Default Re: Flow over a cylinder
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AJ
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Check if your model and mesh is symmetric...

Follow this example from Fluent if this helps...

http://flowlab.fluent.com/exercise/pdfs/cylinder.pdf

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Old   July 2, 2007, 15:43
Default Re: Flow over a cylinder
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taran
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Hi AJ

thanks for the reply

I checked the link but the graph of Cp given in this also shows anamolous result as you may check the graph is not symmetrical for upper and lower surfaces of cylinder which it should be.
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Old   July 16, 2007, 01:24
Default Re: Flow over a cylinder
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sheila
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as far as I know.

above Re=40 there will be a vortex shedding behind the cylinder and this can cause the flow to be assymetric.
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Old   July 17, 2007, 15:15
Default Re: Flow over a cylinder
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taran
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yes i agree with you but even if theres vortex shedding then it should show its effect in the Cp contours which i am not getting . Moreover dont you think that the shedding should still result in symmetry because of the symmetrical geometry . I am not sure about the results therefore need more light on the topic.
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