Discussion Forum

Hello everyone,
I am currently attempting to do a point evaluation with the expression for Biot-Savart Law.

The set up is like this:
I have an array of points that I would like to get the value at using this expression:
1/(4*pi)*intop1((ec.Jy*(z_P-z)-ec.Jz*(y_P-y))/r^3)

where:
intop1 is the integration operator,
z_P, y_P, x_P are the field points, and x.y.z are points within the domain
r = ((x_P-x)^2+(y_P-y)^2+(z_P-z)^2)^0.5

I can get the values with parameter sweeps, but this involves solving the model over and over again for each point I use. (No point in solving for the current density N times, when it only needs to be solved once.)

Ideally I would like the expression to be something like:
1/(4*pi)*intop1((ec.Jy*(z_coord_at_selected_point-z)-ec.Jz*(y_coord_at_selected_point-y))/r^3)
r = ((x_coord_at_selected_point-x)^2+(y_coord_at_selected_point-y)^2+(z_coord_at_selected_point-z)^2)^0.5

I have looked pretty extensively on the internet, and in manuals, but cannot seem to find a command for such a general function. I have seen dom==particular point, ie 7, but I need it to take a general selected point, as well as only taking the x, y, or z coordinate of the point.

Does anyone know of a command I may have missed? Or offer an alternative method to getting this information without having to input an insane amount of parameters into comsol?

I realize I can use the magnetic package to get the field from the current density, but I am needing to do it this way for now, so the magnetics package isn't an option for me.

Any and all help is much apprecated, thanks!