dlooman
Ansys Employee

You can create an elliptical coordinate system with PAR1 and PAR2 of the LOCAL command.  I've never used an elliptical coordinate system to select entities, but you could try with a simple test model:

csys,12   ! elliptical coordinate system

nsel,s,loc,x,value  ! hard to say what this will do.

esln,s,1                       ! select elements with all nodes selected

allsel