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Particle tracing

Posted 30 juil. 2011, 08:32 UTC−4 Charged Particle Tracing, Particle Tracing for Fluid Flow, Results & Visualization 2 Replies

Myounggon Kim
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I have hard time using particle tracing,

without mass in particle tracing is fine,

but if I put the mass on particle tracing,

the streamline(particle) itself, doesn't move at all,

I don't know the reason why,

I am using comsol 3.5 also, Multiphysics in fluid mechaincs in steady state condition

and I think there are not a lot of example regarding particle tracing,

if someone does have some,

I will be happy if someone shares with me,

thanks a lot have a great day :)
2 Replies Last Post 26 avr. 2012, 09:06 UTC−4
COMSOL Moderator

Hello Myounggon Kim

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E. Turk
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Posted: 1 decade ago 5 déc. 2011, 13:11 UTC−5

I have hard time using particle tracing,

without mass in particle tracing is fine,

but if I put the mass on particle tracing,

the streamline(particle) itself, doesn't move at all,

I don't know the reason why,

I am using comsol 3.5 also, Multiphysics in fluid mechaincs in steady state condition

and I think there are not a lot of example regarding particle tracing,

if someone does have some,

I will be happy if someone shares with me,

thanks a lot have a great day :)

BEFORE ALL Update your COMSOL to 4.2a
then

-Check that plot is based on the right solution.
-Increase time in your transient time study.
-Add particle initial velocity (same as boundary u, v)
-Check particle mass




[QUOTE] I have hard time using particle tracing, without mass in particle tracing is fine, but if I put the mass on particle tracing, the streamline(particle) itself, doesn't move at all, I don't know the reason why, I am using comsol 3.5 also, Multiphysics in fluid mechaincs in steady state condition and I think there are not a lot of example regarding particle tracing, if someone does have some, I will be happy if someone shares with me, thanks a lot have a great day :) [/QUOTE] BEFORE ALL Update your COMSOL to 4.2a then -Check that plot is based on the right solution. -Increase time in your transient time study. -Add particle initial velocity (same as boundary u, v) -Check particle mass
Mohammad Goharkhah
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Posted: 1 decade ago 26 avr. 2012, 09:06 UTC−4
Hi

I want to calculate the particle trajectory resulted from fluid flow in a magnetic field based on the following equation:
m*dV/dT= a*dB/dx+ b(V-u)
where B, u and V are magnetic flux density, fluid velocity and particle velocity.

I have simulated the magnetic field (mf) and flow field (laminar flow, spf).
to calculate the trajectories, I have added "Particle tracing for AC/DC" physics and included a "force" node in it.
My question is:
How should I write the right hand side of above equation in the force node?
Can I write:
dB/dx= d(mf.normB,x)
V-u=d(qx,t)-u
Thank you in advance
Hi I want to calculate the particle trajectory resulted from fluid flow in a magnetic field based on the following equation: m*dV/dT= a*dB/dx+ b(V-u) where B, u and V are magnetic flux density, fluid velocity and particle velocity. I have simulated the magnetic field (mf) and flow field (laminar flow, spf). to calculate the trajectories, I have added "Particle tracing for AC/DC" physics and included a "force" node in it. My question is: How should I write the right hand side of above equation in the force node? Can I write: dB/dx= d(mf.normB,x) V-u=d(qx,t)-u Thank you in advance

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