Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
couping electrostatic model and model electric circuit
Posted 24 mai 2012, 12:07 UTC−4 Low-Frequency Electromagnetics Version 4.2 1 Reply
Please login with a confirmed email address before reporting spam
how can an electrostatic coupling model, and model electric circuit?
how can an applied sinusoidal voltage on a boundary?
how can an applied sinusoidal voltage on a boundary?
1 Reply Last Post 24 mai 2012, 14:42 UTC−4
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi
you do not need the CIR physics to apply a sinus modulation on a BC conditions, you can do it directly in ACDC. But if you know your driving circuit and it's impedance, you can model it with the CIR physics to get the overall system behaviour.
For time dependent solvers you apply your voltage or current as a V0*sin(2*pi*freq*t) and you select a correspondingly short stepping time to correctly sample your sinus (set your time stepping to intermediate or strict, but do NOT leave the default "Free" as this si no good for periodic signals). The time stepping will give you all transients and the temporal side of your problem. Main drawback, solving is slow and can be tedious, particularly if you have many slowly damping transients due to non ideal initial conditions.
The other way is to use the harmonic development "Frequency Domain" solvers where you specify the amplitude V0, it's phase (if required) and the frequency or frequency range sweep in the solver settings, and you solve a harmonic developement of your PDE equations. This simulates a steady state sinus regime, concerges mostly much easier and quicer than an equivalent time series, but will NOT give your any transient turn on effects
Check your dc on the two and more, related solvers
--
Good luck
Ivar
you do not need the CIR physics to apply a sinus modulation on a BC conditions, you can do it directly in ACDC. But if you know your driving circuit and it's impedance, you can model it with the CIR physics to get the overall system behaviour.
For time dependent solvers you apply your voltage or current as a V0*sin(2*pi*freq*t) and you select a correspondingly short stepping time to correctly sample your sinus (set your time stepping to intermediate or strict, but do NOT leave the default "Free" as this si no good for periodic signals). The time stepping will give you all transients and the temporal side of your problem. Main drawback, solving is slow and can be tedious, particularly if you have many slowly damping transients due to non ideal initial conditions.
The other way is to use the harmonic development "Frequency Domain" solvers where you specify the amplitude V0, it's phase (if required) and the frequency or frequency range sweep in the solver settings, and you solve a harmonic developement of your PDE equations. This simulates a steady state sinus regime, concerges mostly much easier and quicer than an equivalent time series, but will NOT give your any transient turn on effects
Check your dc on the two and more, related solvers
--
Good luck
Ivar