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multiphase flow-floating error

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Old   July 29, 2005, 06:41
Default multiphase flow-floating error
  #1
masood
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hi, i work on fluidized bed simulation,following error have been occured during the solution:

""Error: Floating point error: overflow"" what should i do?when this error occurs?

and following sentences:

""turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 1745 cells turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 1538 cells""

what should i do for that?is it a problem? regards
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Old   July 29, 2005, 09:26
Default Re: multiphase flow-floating error
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T.Hariharanath
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hi masood,

in the panel solve-controls- limits set turbuelnt viscocity more than 10^5. for over flow problem u set pressure out let( bondary condition) to atmosphereic condition this may help u.
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Old   July 30, 2005, 07:23
Default Re: multiphase flow-floating error
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masood
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Dear Hariharanath! i use pressure outlet with atmospheric condition but atill have this problem(overflow).it was steady state simulation ,now i turn on unsteady state and that problem dont exixst now! and is it true to change turbulent viscosity ratio limit?howmuch is real? regards
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Old   July 31, 2005, 07:17
Default Re: multiphase flow-floating error
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Swarup
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Hi Masood,

you were right in switching to unsteady state. unsteady solution is better suited for highly non-linear problems. i would say that you should not change variable limits. they are set to optimum values and better left untouched.

Swarup.
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