What’s coming in Particle Tracing for 4.3

Phil Kinnane April 10, 2012
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It’s been fun working with the next release. One of the great new features will be in the Particle Tracing Module and will allow particles to interact with each other, and not only with the macroscopic field they find themselves in. It also produces some pretty cool vids.

Galaxy Video, COMSOL Multiphysics v4.3

This educational tutorial model shows how to add customized particle-particle interaction forces, which in this example are the gravitational force between 2500 stars in a galaxy. The galaxy initially rotates as a rigid body, then begins to change shape due to the gravitational forces. While there aren’t many galaxies with just 2500 stars out there, this academic example will be great for getting you all up and working with particle-particle interaction forces.


  1. Bob Weggel April 17, 2012   9:35 pm

    Please keep me posted. My interest is in the interaction between magnetic particles whose magnitude and direction of magnetization depends on a magnetic field generated largely by external sources but also by the particles themselves.

  2. Phil Kinnane April 18, 2012   4:56 pm

    Hi Bob,

    You can already do this using the Auxiliary Dependent Variable feature. This will also be what you would use in the next version.

  3. Mojtaba Nasiri August 6, 2012   9:25 am

    How can I input initial position and velocity of three interacting particles. I can’t do this by “mesh based” option.
    for example the initial positions are: (-1,0),(1,0) and (0,1)

  4. Phil Kinnane August 7, 2012   8:45 am

    Hi Mojtaba,

    I’m not an expert in the subject, but I belive you can use the “Release From Grid” feature. Otherwise, please contact support@comsol.com

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