Electrostatic simulation- getting a field value

General Discussion
1

Dear FF users and developers,

I have a general question regarding Free FEM software. To be clear, I have no experience with Free FEM. I’ve read FF user manual and a few tutrorials, but I did not manage to find the answers to my questions.

What I need to do create and solve 2D model representig the geometry around transformer windings (combination of bare/ paper insulated electrodes, insulating elements and transformer oil as liquid dielectric). For the purpose of post-processing I need to calculate („draw“) electric field streamlines in oil (between insulating elements). To do so, I need to get a field value (Ex, Ey) as well as dielectric constant (relative permittivity) at a certain point (x,y).

  1. Can Free FEM do that- extract el. field values (Ex, Ey) and relative permittivity at predefined points?

  2. Will domain with several regions (10-20) of different permittivty (dielectric constant) be a problem for Free Fem? Will it be complicated to write a function for permittivity?

The questions may be stupid, but answering them would save me a lot of time😊

Thanks in advance.

2

It is not so difficult to choose or change the numbering of the region in FreeFEM with the
“change” function.

After it is write simple so cha7nge value for a region number;

real [int] Perm=[1,2,3,4,5,6,7,8]; // 8 go region form 0 to 7.
and in formulation use
perm[region] ( this is equal (region+1) ) the the formulation.