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Best way to switch on fields in time-dependent simulations

Posted Oct 26, 2012, 10:11 a.m. EDT RF & Microwave Engineering Version 4.2a 2 Replies

Felix
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Hi,

Is there a kind of recommendable way of switching on fields in transient emw-simulations. Right now, I'm using the step-function, included in Comsol, and I have some problems with the converge of the solver. So is it worthy do modify the the time-profile of the turn on process? And if so, what are more suitable choices than Comsol step-function?

Thanks a lot in advance,
Felix
2 Replies Last Post Oct 29, 2012, 11:37 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Oct 26, 2012, 1:39 p.m. EDT
Hi

for me the step function works OK, often one must leave something more than step()=0 at t=0 (by default step() starts at 0.5 at t=0), and then define 3-4 time steps during the step ramp (and during the rect() lowering from 1 to 0)

--
Good luck
Ivar
Hi for me the step function works OK, often one must leave something more than step()=0 at t=0 (by default step() starts at 0.5 at t=0), and then define 3-4 time steps during the step ramp (and during the rect() lowering from 1 to 0) -- Good luck Ivar
Felix
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Posted: 1 decade ago Oct 29, 2012, 11:37 a.m. EDT
Hi Ivar,

Thanks a lot for your help. The hint of not setting the value of step(t=0) too close to 0 was very helpful.

Best,
Felix
Hi Ivar, Thanks a lot for your help. The hint of not setting the value of step(t=0) too close to 0 was very helpful. Best, Felix

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