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Convergence problem
Posted Apr 28, 2011, 8:51 p.m. EDT Microfluidics, Studies & Solvers Version 3.5a 0 Replies
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My model has a simple geometry consisting of two inlets and a main channel. From one inlet pure water and from the other inlet water with a certain concentration of CaCl2 are entering the main channel. In the main channel the viscosity and density depend on the concentration of CaCl2 (the concentration is changing due to diffusion). I know the dependency so I entered the appropriate equations for viscosity and density as a function of concentration.The convective term of the mass transfer equation is also dependent on the flow field. So I need to solve these systems simultaneously but the solution does not converge. My mesh is relatively fine and I have tried all the direct and iterative solvers. The progress of solution sometimes goes up to 49% and then reduces to zero.
This is the first time that I am solving two coupled equation systems with COMSOL and I do not know what I should change to get the solution to converge.
I would really appreciate any help.
Thanks,
Shahrzad
Hello Shahrzad Yazdi
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