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divergence in two phase flow

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Old   October 24, 2016, 07:43
Default divergence in two phase flow
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Nguyen Duy Trong
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Hi everyone,

It is appreciated if some one could help me on this problem,

Recently, I am using Ansys Fluent to do simulation of flow fields around a simple rectangular box with bottom of box is assumed on a flat plat. I specify the inlet with pressure inlet and the outlet with pressure outlet, the other domains are set by wall. The VOF method is used with Open Channel Flow is selected. The assumed velocity is 2 m/s, minimal spacing from box is 0.01 (m). The problem is set run with transient condition and time stepping dt is set at 0.001.
My simulation run well with 100 first iterations, however, it appears suddenly with AMG solver divergence for pressure correction despite of the fact that residual of flow variables is decreasing and floating points.
I really do not know what is the reason for this error, could someone help me to make clear it.

Thank you very much,
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Old   November 1, 2016, 03:08
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post pictures of setup, geometry and divergence
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