It is not very clear from the image what your part looks like. Is it a keyway with a variable fillet radius? In DesignModeler one can use variable radius blend to achive different fillet radii:
https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/wb_dm/dm_variableradius3dmod.html
-Aniket
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