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Problem with 3 Phase Flow
Posted Jun 11, 2023, 7:37 a.m. EDT Computational Fluid Dynamics (CFD), Materials Version 6.0 1 Reply
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The problem is of 3-phase flow of water, oil and air. I used basic materials for this, and yet, I am getting this error, where muB is the Bulk viscosity of water:
"Failed to evaluate initial residual for segregated step 1. Undefined material property 'muB' required by Three-Phase Flow, Phase Field 1 (tfpf1)"
I checked the bulk viscosity definition for water, and COMSOL says here: Air and Water Properties that it is defined as: 2.79 * dynamic viscosity, internally. This dynamic viscosity in turn is just defined as: eta(T). Nothing more. There are lots of other variables defined as a relation of time. I have no idea what to do with this.
Here's an image of the material definition:
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T is temperature, not time.
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com