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Charged particle tracing in combination with a changing electric field

Posted Aug 17, 2018, 6:10 a.m. EDT Electromagnetics, Low-Frequency Electromagnetics, Charged Particle Tracing Version 5.3 3 Replies

Dennis E
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Hi, I would like to combine a charged particle tracing with an evolving electric field between two plates. The issue I have, is that I have no idea how to implement an electric field as a function of time to distract the particle inside of the capacitor.

Any suggestions or ideas to simulate it in a proper way?

Best Dennis

3 Replies Last Post Aug 21, 2018, 9:01 a.m. EDT
Tae Eun Kim
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Posted: 6 years ago Aug 20, 2018, 3:43 a.m. EDT

Hi,

COMSOL software supports t variable as time.

So, if you want to consider a value as a function of time,

  1. setup function in Definitions > Functions
  2. use the function(function name) in a boundary condition you want

If you use Piecewise function, Function name is pw1 by default, and you can setup pw1(t) in boundary condition.

Thanks. Kim

Hi, COMSOL software supports **t** variable as time. So, if you want to consider a value as a function of time, 1. setup function in Definitions > Functions 2. use the function(function name) in a boundary condition you want If you use Piecewise function, Function name is **pw1** by default, and you can setup **pw1(t)** in boundary condition. Thanks. Kim
Dennis E
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Posted: 6 years ago Aug 20, 2018, 8:57 a.m. EDT

Hi, thanks a lot! I implanted the Piecewise function, but i can't see any sweep in the study and when I add the Electrostatic Physics interface to the time dependent step in my study I get an error : "Failed to find consistent initial values. Last time step is not converged.".

Thanks in advance, Dennis

Hi, thanks a lot! I implanted the Piecewise function, but i can't see any sweep in the study and when I add the Electrostatic Physics interface to the time dependent step in my study I get an error : "Failed to find consistent initial values. Last time step is not converged.". Thanks in advance, Dennis
Dennis E
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Posted: 6 years ago Aug 21, 2018, 9:01 a.m. EDT

Hi, thanks a lot! I implanted the Piecewise function, but i can't see any sweep in the study and when I add the Electrostatic Physics interface to the time dependent step in my study I get an error : "Failed to find consistent initial values. Last time step is not converged.".

Thanks in advance, Dennis

Okay, I solved the problem. The piecewise function worked perfect, but I had to add the Electrostatic Physics interface to the time dependent step in my study and for this combination the absolute tolerance in the time-dependent solver was to low and couldn't converged. For higher tolerances and bigger time steps everything is working fine!

>Hi, >thanks a lot! I implanted the Piecewise function, but i can't see any sweep in the study and when I add the Electrostatic Physics interface to the time dependent step in my study I get an error : >"Failed to find consistent initial values. >Last time step is not converged.". > >Thanks in advance, >Dennis Okay, I solved the problem. The piecewise function worked perfect, but I had to add the Electrostatic Physics interface to the time dependent step in my study and for this combination the absolute tolerance in the time-dependent solver was to low and couldn't converged. For higher tolerances and bigger time steps everything is working fine!

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