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April 14, 2009, 01:28 |
flow across sphere at Re=10,000
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#1 |
New Member
Raheel Rasool
Join Date: Apr 2009
Posts: 7
Rep Power: 17 |
Good Day,
I am trying to simulate flow over a sphere(using water 998.2 kg/cubic m) at Re=10,000 (V=0.01005 m/s) using Fluent. The following is my simulational setup:
I would be greatful if somebody can guide me in this regard. Best Regards, Raheel |
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April 14, 2009, 05:03 |
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#2 |
Senior Member
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Second order upwind is not a good choice when performing LES. The Bounded Central Scheme is the suggested one for LES simulations, for momentum and energy.
Also, the time step should be calculated from the Re number. Actually, when performing LES, it is assumed that time filtering is not present so the time step should be chosen following this reasoning (probably a courant number less than 1 is a safe condition). Obviously, the grid spacing should be selected in the same way. Finally, i'd choose NITA- Fractional Step instead of PISO and the PRESTO! interpolation instead of the Standard one. |
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April 14, 2009, 06:11 |
turbulent pipe flow
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#3 |
New Member
fudhail
Join Date: Apr 2009
Posts: 2
Rep Power: 0 |
hi all,
I want to simulate turbulent in pipe flow. Could you guys give me some references so that i can validate my data. Thanks in advanve. |
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April 19, 2009, 23:31 |
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#4 |
New Member
Raheel Rasool
Join Date: Apr 2009
Posts: 7
Rep Power: 17 |
Thanx Paolo for your suggestions. I applied the suggested modifications and the results are much better now.
Thanx Again... |
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