the questions are:

1- how to put a single element in the thickness? (if it is possible)
2- the boundary layer (picture 3 and 4) is not continuous on the walls of the ball and the sidewall, doesn't this cause a problem?
The calculation is static with compressible CO2, k-w sst turbulence model. I set all residuals to 1e-6 and it seems to have trouble converging at the first few iterations, should I be concerned?