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How to control the model step by step in particle tracking?

Posted Nov 21, 2013, 3:39 a.m. EST Charged Particle Tracing, Computational Fluid Dynamics (CFD), Particle Tracing for Fluid Flow Version 4.2a 1 Reply

Feng Lin
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Hi, everyone. I'm currently working on an particle tracing problem in which the particle density is changing with time. Therefore, I need to calculate the particel density every time step (or every several time step). How can I solve this problem?

I want to solve this problem like this: pause the model at each time step==>caculate and update the particle density==>continue the model.

By the way, the varition of the particle density is not a simple function of time, and its value of the (i+1)th step has relationship with the ith step. I've tried the time discrete study, but it dosen't work in particle tracing (only Error: Time derivative only allowed with respect to mesh time)?

Anyone can help me? Thanks a lot in advance! Best wishes!
1 Reply Last Post Dec 16, 2015, 3:24 a.m. EST
COMSOL Moderator

Hello Feng Lin

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斌 胡
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Posted: 8 years ago Dec 16, 2015, 3:24 a.m. EST
Time derivative only allowed with respect to mesh time.
- Expression: d(comp1.c1,t)
define a variable t= TIME and try it again
Time derivative only allowed with respect to mesh time. - Expression: d(comp1.c1,t) define a variable t= TIME and try it again

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