OpenLB — The Complete Guide: Free Lattice Boltzmann Flow Simulation in C++
OpenLB is an open-source library for the lattice Boltzmann method (LBM), developed at the Karlsruhe Institute of Technology (KIT). Instead of solving the Navier-Stokes equations directly, the method simulates particle distributions on a fixed lattice — which makes complicated geometry and flow through porous media relatively simple.
OpenLB
Karlsruhe Institute of Technology
A lattice Boltzmann framework in C++ for complex flow simulation.
Get it from the vendorWhat you get
- Complex geometry — load an STL and build the lattice automatically, without a long meshing step.
- Porous media and filters — flow through complicated internal structures.
- Multiphase and particles — flow with bubbles, droplets and suspended particles.
- Heat transfer — thermal convection alongside the flow.
- Performance — parallel execution, including GPU support.
What to know
OpenLB is a library, not a finished application: every case is a C++ program you write, compile and run, usually on Linux. There are many examples to start from. If you want a graphical interface or routine engineering CFD, another tool will get you there faster.
Related tools
A similar lattice Boltzmann library — Palabos. For finite-volume CFD — OpenFOAM. To view the results — ParaView.
Palabos
University of Geneva
An open lattice Boltzmann solver for fluid flow, from the University of Geneva.
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OpenFOAM
OpenFOAM Foundation
Comprehensive CFD solvers — flow, turbulence, heat transfer and multiphase. Text-file driven, no GUI.
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ParaView
Kitware / Sandia / Los Alamos
Large-scale simulation post-processing — slices, streamlines and animation.
Get it from the vendorMFiX
US Department of Energy — NETL
Multiphase flow simulation for fluidised beds and reactors, from the US DOE.
Get it from the vendorThe bottom line
OpenLB suits researchers and engineers who write code and want the power of lattice Boltzmann for problems that are hard for classical solvers — completely free.