Hello! I am a new user to COMSOL. Can anyone help me please?
I wanted to generate equipotential lines distribution between 2 parallel metal plates that have a needle like structure attached to one of the plates (attached to plate with zero bias in my case). I want to to vary the length of that needle and simulate equipotential lines in all cases. When the needle length reaches midway between the plates, I get desired equipotential lines but on further increasing the length, I get incorrect distrbution of equipotential lines (kindly refer to the attached images). Since the needle is at zero bias all the time then the equipotential line closest to needle should always be the zero bias one (deep blue color in attached figure) and accordingly rest of the lines should get crowded near the end of the needle (moving from deep blue to red colored line) but what i am getting is, high bias lines cutting the needle plane and not getting crowded which is conceptually incorrect. Can somoeone please tell what mistake I am making in the simulation and how to rectify it to get the desired plot. I am using COMSOL Multiphysics 5.1 version.
Thanks in anticipation!