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Hello~~ I encounter some problems when modeling corona wind

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Hello~
I was modeling ionic wind, and I had some problems on it. I selected AC/DC, and PDE module for simulation.
My model is a rectangle 2D domain which represents inner section of pipe. There are two emitting pins, and two grounded plates, which all of them are placed parallel on the pipe's inner walls. I choose AC/DC and PDE modules for simulation. I set emitting electrode as 18kV, and grounded plate as 0kV. Also, I added space charge density, and set its dependent variable as "rho" which coupled with PDE. I used PDE to solve ion transport equation by modifying it as "grad(rho)*grad(V) = rho^2/epsilon, where rho represents space charge density, V stands for voltage, and epsilon is dielectric strength of air." I set the PDE's dependent variable as "rho" which coupled with the AC/DC's space charge density. In PDE, I also set dirichlet boundary condition, which value is calculated by Peek's law, on emitting pin's head.
From the post process of space charge density, I checked the result by observing contour plot. However, always got the same result, that the space charge density was too wide spread across the whole domain. I expected the result of space charge density should be high value near pin, not high value in the whole 2D domain. I already checked the units, and ran with different possible setting in order to acquire ideal result. However, I still can't get it right.
I was also confused with that should I use drift diffusion of plasma module instead of using PDE for ion transport (current continuity)??
Please help me~~ thanks a lot :)

1 Reply Last Post 14.06.2017, 12:44 GMT-4
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Hello Castro Jamal

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Posted: 7 years ago 14.06.2017, 12:44 GMT-4
Hi Castro,

I'm curious if you ever got your question answered or figured this out on your own? If you did, would you mind helping me out as well?
Hi Castro, I'm curious if you ever got your question answered or figured this out on your own? If you did, would you mind helping me out as well?

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