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Solution is converging but have reverse flow on pressure outlet

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Old   June 20, 2013, 04:14
Unhappy Solution is converging but have reverse flow on pressure outlet
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Dinesh
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Dear Friends,
Hi!
I am modelling a hydrodynamic journal bearing which is nothing but one cylinder rotating inside a stationary cylinder and there is a fluid flow thru annulus (which is @50 microns). I have modeled rotating member as a shaft(@3000 RPM) and stationary as bearing. The 50 microns lubricant film is meshed into 32 layers.
My solution is converging but i am facing reverse flow problem at pressure outlet. Is this reverse flow expected in such cases? or if not how to get rid of it?
Thanks in advance
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Old   March 10, 2018, 22:29
Default have you solve it ,I meet the same question?
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wan zhihua
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have you solve it ,I meet the same question?
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Old   March 11, 2018, 02:02
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Hamid Zoka
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In a CFD run generally reverse flow happens if the boundaries are so close to the object(hear bearing) such that gradients of flow parameters like pressure are high. Therefore flow reversal happens to meet the preset outlet boundary condition. It seems you need to adjust the outlet boundary. If the amount of reverse flow is quite low and the results are satisfactory there is no need to modify the domain.
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