mrife
Ansys Employee

Hi hakaera

Please see the MAPDL Modeling and Meshing Guide, chapter 3.1 on global and local coordinate systems:

https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v242/en/ans_mod/Hlp_G_MOD3_2.html

You can create a local elliptical coordinate system.  Then circles created are really ellipses.  Alternatively you could create keypoints that follow a conic equation and then define a spline by the keypoints.  It's been quite a while since I wrote this but check out https://ansys-net.svsfem.cz/macros/para-2.mac  or go to ansys.net and search for 'rife' and you will find my few entries.  One is on creating hyperbolas, ellipses, or parabolas.

Mike