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-   -   multiphase flow-floating error (http://www.cfd-online.com/Forums/fluent/37418-multiphase-flow-floating-error.html)

masood July 29, 2005 06:41

multiphase flow-floating error
 
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

T.Hariharanath July 29, 2005 09:26

Re: multiphase flow-floating error
 
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.

masood July 30, 2005 07:23

Re: multiphase flow-floating error
 
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

Swarup July 31, 2005 07:17

Re: multiphase flow-floating error
 
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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