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Help with solving multiphysics in sequential study steps in COMSOL 4

Posted 7 févr. 2011, 18:21 UTC−5 Studies & Solvers Version 4.0 1 Reply

Asha Parekh
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Hello,

I am modeling a continuous magnetic separator. As it can be seen from the model attached, I have five magnetizable wires that get magnetized by the magnetic field boundary conditions applied to the boundaries of the surrounding domain.
I have applied a "rect" (square wave function) for the magnetic field boundary condition to simulate magnet on-off situation. The transport equation calculates the concentration profiles for particles moving under the influence of convection, diffusion and magnetic force (represented here as voltage).

I solve for magnetic field first as study step 1,

Save the results as solution 2 and

then follow it with solving the transport of dilute species equation and laminar flow simultaneously (since I have expressed viscosity as a function of concentration).

Study step 1 solves very well and I can see that it does get saved as solution 2
but, study step 2 does not solve at, giving errors like "Time 8.268832141965122:
Nonlinear solver did not converge."..which does not make sense because all arguments are within bounds.

If I solve these 3 physics as two studies, I lose out information on square waveform of magnetic field.

Is there a way I can solve these 3 physics?

Are there any examples I can refer to for sequential solving?

Thanks !
Asha
1 Reply Last Post 21 mars 2012, 06:17 UTC−4
COMSOL Moderator

Hello Asha Parekh

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If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Jesus Lucio
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Posted: 1 decade ago 21 mars 2012, 06:17 UTC−4
Hello, Asha:

One year later!!! Do you still need help with your problem? I have solved it using a finer mesh for step 2.

Bye.
Hello, Asha: One year later!!! Do you still need help with your problem? I have solved it using a finer mesh for step 2. Bye.

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