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Problem converging a time dependent study
Posted Feb 12, 2017, 12:08 p.m. EST Fluid & Heat, Microfluidics, Electrochemistry, Studies & Solvers Version 5.2a 0 Replies
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I started using Comsol few months ago. I aim to model the mixing by diffusion of two ionic solutions in a Y microfluidic junction (to eventually model precipitation of CaCO3). I am using the 'creeping flow' and 'Nernst-Planck' modules.
I started with a stationary study which converge. In the file attached:
-study 1(stationary): solve the flow (converge without problem);
-stydy 2 (sationary): step 1 solve the transport of ionic species (using the solution from study 1) while step 2 solve the equilibrium reactions (to model the speciation of carbonic speacies). The study converge.
However I have trouble when moving from a steady step problem to a time-dependent study. In the file attached:
Study 3 (time dependent): solve the flow, and converge without problem
Study 4 (time dependent): I attempt to solve the transport of ionic species (I disabled the equilibirum reaction for now) using either solution from study 1 (flow in stationary condition) or study 3 (time-dependent flow) but in each case the study fail to converge.
Any help would be greatly apreaciated.
Regards,
Thib
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Hello Thibaut Charpentier
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