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how to move a permanent magnet in COMSOL

Posted May 25, 2016, 11:23 p.m. EDT 2 Replies

建 李
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I want to make a permanent magnet oscillate . In comsol，I can make one cylinder move in Solid Mechanics, but once I add mf physics to set the cylinder as a permanent magnet, I don't know how to make such a cylinder magnet move. Please someone could help me figure that out? Do i need to combine Matlab with Comsol.
2 Replies Last Post May 29, 2016, 8:58 p.m. EDT
Mark Harradine
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Posted: 9 years ago May 26, 2016, 8:47 a.m. EDT
Unlike Solid Mechanics models, AC/DC models require that there is a medium (usually air) within which the magnetic/electric fields a re distributed. As such, when your magnet moves within an air domain, the mesh for your Air domain will also need to move.
So, to cut a potentially long story short, you need to use the moving mesh functionality in order to make your model work. You can add this physics by looking under the Mathematics node in the Add Physics screen.

I am sure there are a few samples of the moving mesh in use on the Comsol website to help get you started.

Of course, your model will need some time dependence so you can describe the motion of your magnet.

You can link the movement of the magnet to (for example) an energising coil using an equation of motion based on the electromagnetic force from the coil too. It all depends on what you are trying to simulate.

Good Luck!

Mark
Unlike Solid Mechanics models, AC/DC models require that there is a medium (usually air) within which the magnetic/electric fields a re distributed. As such, when your magnet moves within an air domain, the mesh for your Air domain will also need to move. So, to cut a potentially long story short, you need to use the moving mesh functionality in order to make your model work. You can add this physics by looking under the Mathematics node in the Add Physics screen. I am sure there are a few samples of the moving mesh in use on the Comsol website to help get you started. Of course, your model will need some time dependence so you can describe the motion of your magnet. You can link the movement of the magnet to (for example) an energising coil using an equation of motion based on the electromagnetic force from the coil too. It all depends on what you are trying to simulate. Good Luck! Mark
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Posted: 9 years ago May 29, 2016, 8:58 p.m. EDT
Thank you very much, I do find many samples about moving mesh. Now I am trying to figure that out
Thank you very much, I do find many samples about moving mesh. Now I am trying to figure that out

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