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Hello again
I have a problem with electrostatic analysis, I have two capacitor and in the middle i have a test mass, the distance between capacitors and test mass is about 0.1 mm. I close all my objects in a box to evaluate electric field.

I try to obtain solution in two different ways.

First way: I use four 3D object (mass, 2 capacitor and box) and I assign different boundary condition: mass is grounded and capacitors have port boundary condition with V=10V (Forced) but after the analysis comsol doesn't calculate Electric field, i suppose that electric field doesn't develop itself through the space(the space is box subdomain, i suppose) between capacitor and mass.

Second way: I build the box and I create composite object making the difference between the box and others objects(mass and capacitors), i assign the same boundary conditions but now the problem is different, in fact comsol doesn't end the analysis and it tells to me : error 4100 Failed to generate for subdomain.
This is a very singular situation, because if i move away the capacitors from mass and i increase the distance Comsol makes the analysis.
Thank you.
Luca