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Automatic time step increase in generalized-alpha solver

Posted 03.04.2014, 10:32 GMT-4 Low-Frequency Electromagnetics, Studies & Solvers Version 4.3 2 Replies

Chang-Ho Han
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Particle tracing is conducted by a generalized-alpha solver.
For many cases, when the particle motion is finished, the time step is increased drastically.
However, in current case, time step is oscillating.
In some case, when I turn off the Brownian force (which is a monte carlo modelling), this problem is solved.
However, this is not a solution for the current problem.
What should I do for avoiding this problem?
This problem causes the longer solution time.

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2 Replies Last Post 04.04.2014, 00:02 GMT-4
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 03.04.2014, 16:21 GMT-4
Hi Chang-Ho,

With Brownian force you COMSOL needs a small enough time step such that the random force is “applied” a sufficient number of times. If you loosen the convergence tolerances COMSOL will take bigger time steps.

Nagi Elabbasi
Veryst Engineering
Hi Chang-Ho, With Brownian force you COMSOL needs a small enough time step such that the random force is “applied” a sufficient number of times. If you loosen the convergence tolerances COMSOL will take bigger time steps. Nagi Elabbasi Veryst Engineering
Chang-Ho Han
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Posted: 1 decade ago 04.04.2014, 00:02 GMT-4
Thank you for the rapid response^^

Is it also dependent on the particle number?
Thank you for the rapid response^^ Is it also dependent on the particle number?

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