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MHD

Madhura Gurjar
I am working with magnetohydrodynamics.
I have to simulate a conductive fluid which is stationary at first. There are 4 magnets under the fluid. AC Electric current of 0.1Hz frequency is passed through the fluid. The fluid begins to move, and it oscillates as the current changes direction. How do I simulate this? Which physics do I use? Since the magnetic field is constant (permanent magnets), do I just need to add a source term in the NS equation? How do I do that? and since the lorentz force is J x B, how do I bring in current density into the picture? I know the conductivity of the fluid (salt concentration), I know the voltage I am applying.
Can I simulate that?

3 Replies Last Post 2017年6月18日 GMT-0400下午3:01
COMSOL Moderator

Hello Madhura Gurjar

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Posted: 5 months ago 2017年5月23日 GMT-0400上午8:06
You need the Magnetic Field (mf) interface from AC/DC (it gives you Maxwell's equations) and a Single Phase Fluid (spa) interface (which gives you Navier-Stokes' equations). Then you can couple them through the volume force, saying that those forces are the Lorentz forces.
You need the Magnetic Field (mf) interface from AC/DC (it gives you Maxwell's equations) and a Single Phase Fluid (spa) interface (which gives you Navier-Stokes' equations). Then you can couple them through the volume force, saying that those forces are the Lorentz forces.

Posted: 5 months ago 2017年5月24日 GMT-0400上午9:47
Hi,

The following example on induction pump might be useful here.
www.comsol.com/model/inductive-liquid-metal-pump-5907

Best Regards,
Nirmal
Hi, The following example on induction pump might be useful here. https://www.comsol.com/model/inductive-liquid-metal-pump-5907 Best Regards, Nirmal

Posted: 4 months ago 2017年6月18日 GMT-0400下午3:01
Thank you very much about your helpful post.
Thank you very much about your helpful post.

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