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December 6, 2017, 04:06 |
insufficient precision on multigird level
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#1 |
New Member
Join Date: Oct 2017
Posts: 10
Rep Power: 8 |
Hello, I have a warning about the insufficient precision on multigird level.
WARNING: insufficient precision on multigrid level 1, nRows = 11374 AMG coarsening halted. This may indicate double precision version is needed. Temperature limited to minimum value 931 times on model-part "Body 1" After several times iterations then I have got an error and the Simulation stops. Error: AMG solver diverged. A floating point exception has occurred: floating point exception [Invalid operation]. Can anyone tell me how to inprove the precision of multigrid Level? I am using multiphase segregated flow to simulate an Interphase reaction. Thanks!! |
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December 6, 2017, 06:22 |
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#2 | |
Senior Member
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Quote:
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December 6, 2017, 08:30 |
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#3 |
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Location: USA
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December 6, 2017, 09:52 |
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#4 | |
New Member
Join Date: Oct 2017
Posts: 10
Rep Power: 8 |
Quote:
I checked my mesh, it contains 79920 cells, I am not sure if it fine enough for a 0.0015m3 region? The lowest cell quality is 0.4, and other mesh quality parameters don't indicate there are bad cells in my mesh. The simulation is about a porous region with a heterogeneous reaction in laminar flow. Following models are selected: • Cell quality remediation • Eulerian multiphase • Gradients • Laminar • Multiphase equation of state • Multiphase interaction • Multiphase segregated flow • Phase coupled fluid energy • Steady • Three dimensional |
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December 6, 2017, 10:05 |
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#5 | |
New Member
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Posts: 10
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Quote:
In my simulation there is a reactor heated up by an inner tube, and I set the outer wall of the heating tube constantly 320 degrees. So I assumed it leads to the temperature limit? |
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