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-   -   the classical problem of the flow around a Cylinder Re=35? (http://www.cfd-online.com/Forums/fluent/69219-classical-problem-flow-around-cylinder-re-35-a.html)

behrang2009 October 15, 2009 18:53

the classical problem of the flow around a Cylinder Re=35?
 
Dear friends
I have modeled the classic problem of the flow around a cylinder. The textbook says that I should get two laminar vortexes after the cylinder when 15<Re<40 but my results are very similar to the potential flow solution. I employed the laminar viscosity model. Any tips?
Thanks

Figd84 October 16, 2009 11:38

Check domain dimentions.

teguhtf October 16, 2009 15:06

Hi
I Agree with Figd84. We must choose the dimension before. In GAMBIT, the default of size is in meter.
teguhtf

behrang2009 October 16, 2009 15:44

Thanks for your responses guys. I actually considered the fact that the mesh is created in meters in Gambit. The good thing is that the default for Fluent is meters.
Any idea?

teguhtf October 16, 2009 19:35

15<Re<40 is very small reynold number. It's just like fish moving in water!!! please read this: http://jilawww.colorado.edu/perkinsg...lds_number.pdf
Hope it helps
teguhtf:)


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