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SolidWorsk Flow Simulation: Rotating region - unnaturally low flow

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Old   January 29, 2019, 15:30
Unhappy SolidWorsk Flow Simulation: Rotating region - unnaturally low flow
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Hello everybody ,
I have problem with rotational region. There is no flow or very very small flow between rotational region and rest of the fluid:

I know, that in real world this stirrer really works, and it should mix fluid in large distance (I've got TBM 18,5 variant, so it should be flow on 90m):

Iíve tried to change rotational region
- bigger:

- or smaller:
and there is the same story.

I have large tank (aprox. 120x35x4m):

and some stirrer (aprox 800 mm diameter):

Initial mesh Iíve tried on levels 1,2,3,4 and 5, with 0,001m min gap and 0,003m wall thickness or without manual these manual gaps and there is the same story. Fluid is water, analysis is internal flow. Solver is working fine etc. Iíve tried also different speeds of the rotor Ė from 300 to 4000 rpm, almost the same story. There is almost no difference if it have local initial mesh area or without it. Anyone know what the problem is?

Thank you in advance,
Marian - student from Poland
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flow simulation, low flow, problem, rotating region, solidworks

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