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Aspect Ratio at high turbulent and swirled flows

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Old   May 19, 2004, 02:37
Default Aspect Ratio at high turbulent and swirled flows
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hi everybody!

while i was simulating a gascyclone i have mentioned a special behaviour of the solution. when im refine the grid in radial direction the tangential velocity increases as aspected. unfortunately the axial velocity decreases until i dont refine the grid in axial direction. i think that this behaviour is caused by the deterioration of the aspect ratio.

my questions:

1) has anybody experience with that kind of problem?

2) i have heard that the permissed aspect ratio that is stated in the fluent user manual is to high for high turbulent and swirled flows (e.g. gascyclone flows). does anybody know values for the aspect ratio that should be achieved for that problem???

thanx christoph
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