ANSYS Fluent is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The best Mac alternative is OpenFOAM, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to ANSYS Fluent and 11 are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to ANSYS Fluent are Elmer (Free, Open Source), SimScale (Paid), COMSOL Multiphysics (Paid) and CFDTool (Freemium).
Elmer is an open source multiphysical simulation software mainly developed by CSC - IT Center for Science (CSC). Elmer development was started 1995 in collaboration with Finnish Universities, research institutes and industry.
CFDTool™ (https://www.cfdtool.com) is a fully integrated and dedicated MATLAB® Computational Fluid Dynamics (CFD) Toolbox for modeling and simulation of fluid flows with coupled heat transfer. Based on FEATool Multiphysics™ (...
FEATool Multiphysics is a fully integrated Finite Element FEM CAE simulation toolbox for Matlab. With FEATool you can easily model and simulate heat transfer, fluid flow CFD, structural mechanics, chemical reactions, general PDEs, and more.
The program package FEATFLOW is both a user oriented as well as a general purpose subroutine system for the numerical solution of the incompressible Navier-Stokes equations in two and three space dimensions.