Free and open-source from The OpenFOAM Foundation. Ansys Forte | Internal Combustion Engine Design Software
Available for free on GitHub as a standalone .zip file for Windows. 2. OpenFOAM (Internal Combustion Engine Module) engine simulation software free download
Real-time fluid simulation, 3D engine editor, and custom crankshaft/valve timing adjustments. Free and open-source from The OpenFOAM Foundation
Advanced research, graduate students, and engineers needing high-fidelity fluid flow and chemical reaction modeling. 3D engine editor