Ansys Employee

Saves me asking the usual question! :)  

A scalar is an extra equation we solve over the top of the normal model. Check scalar diffusivity (no one ever looks at the materials panel) but it's also possible the solver is struggling with scalar gradient/motion as not all of the usual stability numerics apply.  If it's not in the manual I can't really comment, and electric fields are one of the areas I know very little about.