# Inconsistent potential over a cylindrical surface in COMSOL

I made the following construction in COMSOL (This is a cut):

Two cylinders, the inner one in the middle is a solid cylindrical conductor. The thick outer cylindrical shell, along with the two small cylinders above and below the even smaller middle one, represent air.

I set the space charge density of the conductor (the small cylinder in the middle), I applied a tetrahedral meshing to the conductor and a swept mesh to the surroundings. After running the simulation, I was interested in the potential over the surface of the conductor, here's what it looked like:

There is clearly an inconsistency in the plot above, since the potential is constant over the surface of a conductor, the plot should be monochromatic.

Link to the relevant .mph file.

Any help would be much appreciated.

• There is no chance to know if your plot is wrong because your colorbar just shows one value. – nicoguaro Sep 2 at 20:14
• Thanks for your help, I think the problem was I had the "Hide for Geometry" option enabled which interfered with the plot, here's the same plot with said option disabled, you can see the colorbar indicating the same value, $4.52\times 10^{10}$, on both ends of the spectrum, meaning the potential is constant. – Hilbert Sep 2 at 21:58