I How to define infinite extent elements in COMSOL?

[feynman1]

This figure shows 2 capacitor plates. Except the region in between the 2 plates, I want to set the others as infinite elements. How to 'stretch' the x and y directions in the infinite element settings?

 

[feynman1]

I don't know why my question was edited and changed from 'infinite element' to 'infinite extent element'. I've never heard of the latter.

 

[DrClaude]

In the y direction, I think you simply need to put the boundaries at the edge of the capacitor plates (considering you would put each plate at a constant potential).

For the x direction, you then have simply a 1D problem.

 

[feynman1]

In the y direction, I think you simply need to put the boundaries at the edge of the capacitor plates (considering you would put each plate at a constant potential).

For the x direction, you then have simply a 1D problem.

Thanks. How to arrange the infinite element settings according to what you say?

 

[DrClaude]

Thanks. How to arrange the infinite element settings according to what you say?

The dimensions not included in the model corresponds to an infinite extent, so this is taken care of.

As for the other direction, I would simply make the computational area end with the plate. For example, in the 2D model you posted above, the line at R1 would be the same as the one at R6. COMSOL will then not compute any electric field below the bottom plate, which is equivalent to having the plate extend to infinity.

 

[feynman1]

The dimensions not included in the model corresponds to an infinite extent, so this is taken care of.

As for the other direction, I would simply make the computational area end with the plate. For example, in the 2D model you posted above, the line at R1 would be the same as the one at R6. COMSOL will then not compute any electric field below the bottom plate, which is equivalent to having the plate extend to infinity.

How to adjust the setting in this pic?

 

[YasmineY]

In the y direction, I think you simply need to put the boundaries at the edge of the capacitor plates (considering you would put each plate at a constant potential).

For the x direction, you then have simply a 1D problem.

Hello Sir,
I implemented a 1D model in x-direction as the problem is infinite is infinite in y-direction. However, I obtained different results.
Is there a specific boundary I shall define to indicate that the 1D model in x-direction shall be extended?
Thanks in advance