# Which Turb. Model is Suitable for Re=140000?

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 September 8, 2007, 05:04 Which Turb. Model is Suitable for Re=140000? #1 Mahbub Guest   Posts: n/a Dear I am trying to simulate the flow over cylinder at Re=140000. I tried by some turbulent model, but didn't get good result. I tried to find Cd and the vortex shedding. Could any one please tell me, which model is suitable in this case ? Thanking all of you. Mahbub

 September 9, 2007, 04:17 Re: Which Turb. Model is Suitable for Re=140000? #2 Jesse Guest   Posts: n/a SST

 September 9, 2007, 07:58 Re: Which Turb. Model is Suitable for Re=140000? #3 Mahbub Guest   Posts: n/a Dear Jesse Thank you for your co-operation. I have used K-omega SST turbulent model but I didn't get the vortex shedding and my Cd=0.112 (that is far from experimental value). I use: u=1, mu=1, D=1, densiry=140000 to get Re=140000 also put k=0.00138, w=0.11, time step size=0.014. Would you please give me any sugession? Mahbub

 September 11, 2007, 20:34 Re: Which Turb. Model is Suitable for Re=140000? #4 Sham Guest   Posts: n/a I think with such high Re, your time step size is large. Try setting your time step size so that you Courant number is less than 1 as I was told. Also amke sure your grid is fine enough at the critical region.

 September 12, 2007, 08:13 Re: Which Turb. Model is Suitable for Re=140000? #5 Mahbub Guest   Posts: n/a Dear Sham I used Time step size = 0.01, and the courant number = 0.7, isn't enough? I still confused to set Re number. When I change density to change Re then I get the result, but if I copy Water-liquid from fluent data base and change velocity to change the Re then I didn't get the result. I think Razvan can give me any suggestion. Could you please gibe me the mail address of Razvan? Thanking you, Mahbub

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