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Convergence problems in electrohydrodynamics
Posted Apr 17, 2024, 10:29 a.m. EDT Computational Fluid Dynamics (CFD) Version 6.1 1 Reply
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Using electrostatics, level sets, laminar flow, and dilute matter transfer, the calculation appears that variable constraints are found in different separation groups, try merging these groups. The last time step does not converge.!
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General multiphysics problem configurations, especially those that are not provided to you ready-made (so to speak) in Comsol pull-down menus, must be prepared very carefully. Perhaps it is needless to say, but if you have not already done so, then you should gain experience applying Comsol Multiphysics to model several, simpler (individual physics) problems first. Then, I suggest tackling multi-physics problems in stages of increasing complexity, making sure each individual physics setup behaves and solves as expected, and that simplified combinations also work well. Time domain models usually bring additional execution challenges (compared to stationary or frequency domain models), especially if strongly coupled physical phenomena take place on very different time scales. Non-linear computations add yet more complexity and even more ways for solvers to fail to converge. Your message does not provide enough information to identify your particular issue(s). Consider posting your .mph file to the forum so that any interested readers here can examine it. You may receive more specific suggestions, that way.
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