OpenStudio is a free environment on top of EnergyPlus: geometry, construction and system libraries, and scripts to compare options. The practical way to use it.
QBlade designs blades and simulates a whole wind turbine: aerodynamics, structure, control and waves. Community Edition: free for non-commercial use only.
OpenMC is an open-source Monte Carlo code for neutron and photon transport: criticality, flux, fuel depletion and shielding, set up fully in Python.
OpenMDAO is an open-source Python framework from NASA that links analysis codes from different disciplines and computes derivatives for fast optimisation.
OpenVSP from NASA builds aircraft from parametric parts — wing, fuselage, engine, tail — feeding aerodynamics, wetted areas and mass estimates. Ideal for UAVs.
XFOIL by Mark Drela of MIT is the classic airfoil tool: lift, drag, pressure distribution, transition and inverse design. How to use it and its limits.
OpenFAST from NREL couples aerodynamics, structure, control and hydrodynamics into one wind turbine simulation, onshore or offshore. The reference load tool.
MFiX from the US NETL lab simulates gas-solid flow in fluidised beds, reactors and gasifiers: two-fluid, DEM and PIC models, with a GUI. Who it suits.
Xcompact3d is an open-source CFD solver for turbulence research: high-order compact finite differences, DNS and LES on thousands of cores. Who it suits.
Palabos is an open-source lattice Boltzmann library from the University of Geneva: flow in porous rock, blood vessels and packed beds, laptop to cluster.
OpenLB is an open-source C++ lattice Boltzmann library from KIT: porous media, multiphase, particles and complex geometry, on CPUs and GPUs. What it is.
Nektar++ is an open-source spectral/hp element framework: incompressible and compressible flow, cardiac electrophysiology and general PDEs at high order.
