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Help! Divergence detected in AMG solver: pressure correction

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Old   September 2, 2011, 10:11
Default Help! Divergence detected in AMG solver: pressure correction
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Hi,

I am running a 3D fluent simulation consisting of a rotating disk with a column of fluid (air) above it. The disk is spinning at 1500 rpm. After 1000 iterations I get the error:

Divergence detected in AMG solver: pressure correction
Primitive error at node 1: floating point exception

I am running a pressure based steady solver.

The BC's are Pressure inlet at the inlet (the top of the column of fluid), pressure outlet at the radial wall surrounding the disk.

Since it seems to be converging until 1000 iterations, is it a mesh problem or is it a BC problem? I tried decreasing the URF for pressure but it doesn't help.

If you need more details let me know.

Thanks.
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Old   September 2, 2011, 13:04
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Stuart Buckingham
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What p-v coupling are you using? And which AMG scheme?
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Old   September 2, 2011, 16:11
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P-V coupling:

scheme: simple
gradient: least squares based
pressure: presto
momentum: first order upwind

AMG: pressure-based V-cycle

Thanks.
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Old   September 2, 2011, 16:12
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P-V coupling:

scheme: simple
gradient: least squares based
pressure: presto
momentum: first order upwind

AMG: pressure-based V-cycle

Thanks.
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