Comparison of Dielectric Shielding- COMSOL Simulation

The dielectric shielding boundary condition is meant to approximate a thin layer of

material with high relative permittivity compared to its surroundings. This boundary

condition is available for electrostatic field modeling. This example compares the dielectric

shielding boundary condition to a full-fidelity model and discusses the range of

applicability of this boundary condition. Two parallel plates in free space(relative permittivity, εr = 1) have a voltage difference applied to them, forming a capacitor. Between these plates there is a 1 cm outer diameter circular inclusion with a wall thickness of 1mm. The walls are made of a high dielectric (εr = 20) material. The walls of this inclusion are modeled two ways, first using a full fidelity model that includes the thickness of the walls, and also using the dielectric shielding boundary condition. The inside of the inclusion has the same properties as free space. The two models are separate, but are being modeled simultaneously for comparison. The location of the dielectric shielding condition is at the centerline, midway between the inner and outer radii of the full fidelity model. when using the dielectric shielding condition, the total volume of the surrounding material is slightly larger, since the thickness of the wall is not being explicitly modeled.

Reference: Dielectric Shielding Comparison (comsol.com)

I have got more understanding of dielectric shielding from this simulation and how dielectric shielding reduce electromagnetic exposer to surroundings .

Fig:1 Geometry

Fig: Generated Mesh

Fig:1 Electric Fields