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Particle Tracing: Change of Charge on Wall hit

Posted Feb 10, 2014, 5:57 a.m. EST Charged Particle Tracing, Fluid & Heat, Particle Tracing for Fluid Flow Version 5.0 3 Replies

Arno Tuna
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Hello,

I have a simulation of a charged particle with mass in an electric field. The particle movement is generated with the subnode electric force.

Where i need so help now is following:
The charge number Z of the particle should change when it hit a wall. Is there a way to perform such "if" condition?

Best regards
3 Replies Last Post Nov 17, 2016, 1:24 p.m. EST
Daniel Smith COMSOL Employee

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Posted: 1 decade ago Feb 10, 2014, 9:05 a.m. EST
Hi Arno, you can add an "Auxiliary Dependent Variable" to your model for the charge. In the "Wall" condition you can use the option "Assign new value to auxiliary variable" which allows you to change its value when the particle hits the wall (see attached V4.3b model).

This requires V4.3b or later.

Dan
Hi Arno, you can add an "Auxiliary Dependent Variable" to your model for the charge. In the "Wall" condition you can use the option "Assign new value to auxiliary variable" which allows you to change its value when the particle hits the wall (see attached V4.3b model). This requires V4.3b or later. Dan

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Arno Tuna
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Posted: 1 decade ago Feb 10, 2014, 9:35 a.m. EST
Thank you very much!

Best regards
Thank you very much! Best regards
Bill
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Posted: 8 years ago Nov 17, 2016, 1:24 p.m. EST

Hi Arno, you can add an "Auxiliary Dependent Variable" to your model for the charge. In the "Wall" condition you can use the option "Assign new value to auxiliary variable" which allows you to change its value when the particle hits the wall (see attached V4.3b model).

This requires V4.3b or later.

Dan


Dear Dan,
Is it possible to couple the flow field with the particle tracing? I want to simulate the particle deposition on a wall, and is it also possible to let the uncharged particles to deposit on a wall?
If I use the charged particle tracing module, then how to couple it with the flow field?
Thank you in advance.
Best Regards,
Bill
[QUOTE] Hi Arno, you can add an "Auxiliary Dependent Variable" to your model for the charge. In the "Wall" condition you can use the option "Assign new value to auxiliary variable" which allows you to change its value when the particle hits the wall (see attached V4.3b model). This requires V4.3b or later. Dan [/QUOTE] Dear Dan, Is it possible to couple the flow field with the particle tracing? I want to simulate the particle deposition on a wall, and is it also possible to let the uncharged particles to deposit on a wall? If I use the charged particle tracing module, then how to couple it with the flow field? Thank you in advance. Best Regards, Bill

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