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Dielectrophoresis simulations or gradient of electric field

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Hi,

I am doing dielectrophoresis simulations using simulations. Basically I use AC/DC module -conductive medium DC to get the electric field distribution. But I face some problems geting gradient of electric field. I tried some methods of previous threads but was not successful.

I have some questions.

1. If I want to extract gradient of electric field in x direction, I define d(Ex_dc^2,x) in global expressions. Is that right ?
2. The bias is a AC voltage but I only know how to apply a DC voltage. Anyone knowing what module should I use then. I simplify the problems by doing DC simulation.

Anyone doing this kind of simulations? We can discuss together... Thanks.

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