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Two Phase Fluid Flow - Polymer Calendaring: Unknown Error
Posted Sep 22, 2011, 9:14 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD), Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 4.2 1 Reply
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I am working with the Phase Field branch of Laminar Two-Phase Flow to model the nip region of a calendaring operation (two large rollers squeeze a fluid through a small gap to create a uniformly thick sheet). The two phase model is used to provide a Moving Wetted Wall boundary condition where the calendared fluid detaches from the calendared sheet (two phases are a polymer fluid and air). The rollers are spinning at some velocity and the sheet has some contact angle - currently set by myself - as it releases from the roller.
The problem: The laminar two-phase flow, phase field physics defaults to a time-dependent solver which I do not necessarily need. But, starting with this solver, it goes through a Phase Initiation step without issue and then moves on to the time-dependent solver. Before it can take any time steps I get the error: Undefined value found. This would seem simple, but the "detail" it provides says: "Undefined value found in the constraint residual vector: NaN of Inf in vector." Can anyone help resolve what this might be referring to or how I can find out what is not defined? I'm not sure where to begin troubleshooting...
The error handling/messaging in COMSOL has never impressed me, but this one is especially poor.
Thanks in advance! Mark
Hello Mark Suchomel
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Have you solved the problem as I am also facing a similar kind of problem in version 04a?
Thanks.