Aspect ratios are calculated for faces as explained in the links:
https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/wb_msh/msh_aspect_triangle.html
https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/wb_msh/msh_aspect_quad.html
You can control aspect ratio either by multiple options by checking where you have offending aspect ratio elements.
one can use target quality:
https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/wb_msh/wb_msh_d5l_jw5_jw.html
or if it is due to inflation layers choose correct method of using first aspect ratio (https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/wb_msh/msh_First_Aspect_Ratio.html) or last aspect ratio (https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/wb_msh/msh_Aspect_Ratio_b_h.html).
Why do you want to control the aspect ratio and to what extent you want to control it?
-Aniket
Guidelines on the Student Community