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AC/DC simulation_Space charge added to spheres
Posted Feb 4, 2015, 9:35 a.m. EST Low-Frequency Electromagnetics, Geometry, Materials, Studies & Solvers Version 4.4 1 Reply
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Hello,
I am new to the AC/DC modelling using Comsol.
Basically, I have a 3D unit block with 8 nano-particles inside. Each nano-particles is consisted of four different layers. I applied the positive space charge to the inner sphere and the negative charge to the outer three. In the meantime, I applied the voltage and ground to two opposite surfaces of the unit block. Ideally, the space charges I added should be an exponential function 5*exp(w1*(10^9)-7.5 and -5*exp(7.5-w1*(10^9) where W1 is the distance between any point on the sphere to the centre. These two functions are supposed to be symmetrical but different polarities. However, once I plotted the space charge of the cut line passing through the centre of the sphere. It does not seem to be symmetrical, even without any voltage applied around the unit block.
I am not sure if the space charge I added has the correct formula or the way of adding the charge is correct. I have attached two graphs which are the ideal space charge and the actual space charge generated from my model, respectively. As I mode is too large, it can be found from the Dropbox:
www.dropbox.com/s/6cw7d8iozdsuryi/2wt%25c%2815.01.27%29.mph?dl=0
Appreciate any suggestions and comments on these problems.
Best,
Yang
I am new to the AC/DC modelling using Comsol.
Basically, I have a 3D unit block with 8 nano-particles inside. Each nano-particles is consisted of four different layers. I applied the positive space charge to the inner sphere and the negative charge to the outer three. In the meantime, I applied the voltage and ground to two opposite surfaces of the unit block. Ideally, the space charges I added should be an exponential function 5*exp(w1*(10^9)-7.5 and -5*exp(7.5-w1*(10^9) where W1 is the distance between any point on the sphere to the centre. These two functions are supposed to be symmetrical but different polarities. However, once I plotted the space charge of the cut line passing through the centre of the sphere. It does not seem to be symmetrical, even without any voltage applied around the unit block.
I am not sure if the space charge I added has the correct formula or the way of adding the charge is correct. I have attached two graphs which are the ideal space charge and the actual space charge generated from my model, respectively. As I mode is too large, it can be found from the Dropbox:
www.dropbox.com/s/6cw7d8iozdsuryi/2wt%25c%2815.01.27%29.mph?dl=0
Appreciate any suggestions and comments on these problems.
Best,
Yang
1 Reply Last Post Feb 5, 2015, 4:05 a.m. EST
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Posted:
9 years ago
Anyone? Thanks.