the classical problem of the flow around a Cylinder Re=35?

behrang2009 · October 15, 2009, 19:53

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, 12:38

Check domain dimentions.

teguhtf · October 16, 2009, 16:06

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, 16:44

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, 20:35

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

October 15, 2009, 19:53	the classical problem of the flow around a Cylinder Re=35?	#1
behrang2009 Member Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 17	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

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October 16, 2009, 12:38		#2
Figd84 Member Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 17	Check domain dimentions.

October 16, 2009, 16:06		#3
teguhtf Senior Member teguh hady Join Date: Aug 2009 Location: Saga, Japan Posts: 222 Rep Power: 18	Hi I Agree with Figd84. We must choose the dimension before. In GAMBIT, the default of size is in meter. teguhtf

October 16, 2009, 16:44		#4
behrang2009 Member Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 17	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?

October 16, 2009, 20:35		#5
teguhtf Senior Member teguh hady Join Date: Aug 2009 Location: Saga, Japan Posts: 222 Rep Power: 18	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