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Forum: Main CFD Forum

August 1, 2013, 15:17

Replies: 20

Particle tracking algorithms

Views: 3,081

Posted By triple_r

I didn't have access to paper you mentioned, so I...

I didn't have access to paper you mentioned, so I don't know how they have derived, but my guess is it comes from Einstein's equation for the PDF for Brownian motion of a particle:

P(x, t|x_0)
...

Forum: Main CFD Forum

July 18, 2013, 11:06

Replies: 20

Particle tracking algorithms

Views: 3,081

Posted By triple_r

If you are going to use E-M for SDE when you add...

If you are going to use E-M for SDE when you add Brownian motion, then I don't see the point in using a second order method for other terms.

I myself have only used EM, and my reason was its being...

Forum: Main CFD Forum

July 17, 2013, 14:45

Replies: 20

Particle tracking algorithms

Views: 3,081

Posted By triple_r

I thought the issue was stability and not...

I thought the issue was stability and not accuracy, my bad. That was just an example for how to get an stable solution. You can make it more accurate if you assume a known form for the drag...

Forum: Main CFD Forum

July 17, 2013, 11:55

Replies: 20

Particle tracking algorithms

Views: 3,081

Posted By triple_r

How about trying an implicit method? or a mix of...

How about trying an implicit method? or a mix of implicit and explicit (implicit in time derivative, but explicit in drag coefficient for example). You might even be able to integrate it...

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