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Multiphase VoF Problem

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Old   September 21, 2018, 10:48
Default Multiphase VoF Problem
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Jin Ryoo
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I'm trying to simulate a 2D gravity driven flow in a V funnel (image attached). Iím using multiphase explicit VOF with courant number = 1. Phase 1 is air and phase 2 is a Bingham fluid. The flow is transient with gravity ON.

The outlet BC is pressure outlet (0 Pa) with backflow vol. fraction of phase 2 = 1
The inlet BC is pressure inlet (rho * g * h) with vol. fraction of phase 2 = 0

In this case the fluid flows unrealistically fast. The flow expected at ~2s is reached at ~0.2s.

I tried an inlet BC of pressure outlet (0 Pa) with backflow vol. fraction of phase 2 = 0. This was based on a tank drainage tutorial from YouTube. This BC works accurately for water but not for non-Newtonian laminar case.

Is there some pressure setting or solution method that Iím missing here. Any help would be appreciated.
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fluent 17.1, gravity flow, vof multiphase

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