ANSYS Fluent is described as 'software contains the broad physical modeling capabilities needed to model flow, turbulence, heat transfer, and reactions for industrial applications ranging from air flow over an aircraft wing to combustion in a furnace, from bubble columns to oil platforms, from' and is an app in the Education & Reference category. There are more than 10 alternatives to ANSYS Fluent for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and GNU Octave. The best alternative is OpenFOAM, which is both free and Open Source. Other great apps like ANSYS Fluent are SimFlow (Paid), Elmer (Free, Open Source), SimScale (Paid) and COMSOL Multiphysics (Paid).
SimFlow is a powerful CFD software, focused on engineering and science. It combines an intuitive user interface with the advantages of the open-source OpenFOAM® libraries in something more than a compact OpenFoam® GUI.
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Almost everyone thinks SimFlow is a great alternative to ANSYS Fluent.
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.