OpenFOAM

OpenFOAM is an open-source CFD (Computational Fluid Dynamics) toolbox widely used in academia and industry. It solves complex fluid flow, heat transfer, and other continuum mechanics problems through command-line solvers and custom libraries. Users can script advanced scenarios or tweak source code. Though lacking a built-in GUI, third-party interfaces exist. OpenFOAM suits fluid simulation experts who want a free, extensible, and highly customizable solver suite for advanced physics modeling.