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Forces in Transverse direction

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Old   August 6, 2007, 12:46
Default Forces in Transverse direction
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Virag Mishra
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Hi My problem involves unidirectional flow along the X axis its an external flow problem with body over which the fluid is flowing being symmetrical about the X axis. To my surprise when i'm constructing a structured mesh i'm not getting any force in Y and Z direction, but a non zero force value when i'm using tetrahedral cells.
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Old   August 6, 2007, 18:25
Default Re: Forces in Transverse direction
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Glenn Horrocks
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Hi,

Is it a significant force? You will not get exactly zero force, but if the flow is truly symmetrical it should be an insignificant force.

Alternatively if the flow is non-symmetric then you could be seeing a non-symmetric wake. Then there will be a significant cross force.

Glenn Horrocks
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Old   August 6, 2007, 23:07
Default Re: Forces in Transverse direction
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Virag Mishra
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Ya, as i said the force is significant if i'm using unstructured mesh; but not in a hexahydral mesh case.
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Old   August 7, 2007, 08:54
Default Re: Forces in Transverse direction
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brunoc
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Have you done a mesh refinement study?
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Old   August 7, 2007, 10:32
Default Re: Forces in Transverse direction
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Virag Mishra
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ya quality is fine. and mesh is getting exported.
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Old   August 7, 2007, 18:18
Default Re: Forces in Transverse direction
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Glenn Horrocks
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Hi,

Brunoc was asking about a mesh refinement study. This checks whether the mesh size you are currently using is adequate to resovle the important features of the flow. This is a different thing to mesh quality.

Regards, Glenn Horrocks
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