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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