OpenLB

Free#14 of 22 in CFD software

Open-source C++ library for lattice Boltzmann CFD simulations.

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At a glance

Editor score
Not yet scored
Pricing
Free plan
Best for
Developers building lattice-Boltzmann CFD workflows
Free plan
Yes
Paid from
None
Deployment
Desktop
Facts checked
24 Sep 2026

Where it wins
- Parallel MPI, OpenMP, SIMD and GPU execution
- Built-in STL voxelization and primitive geometry creation
- Multiphase, particle, thermal and electrochemical models
Where it doesn't
- Requires compiling and self-hosting the C++ source
- Focused on lattice-Boltzmann methods rather than broad CFD approaches
- Visualization uses VTK output with external tools such as ParaView

Our verdict on OpenLB

OpenLB is a modular C++ library for researchers and engineers developing lattice-Boltzmann computational fluid dynamics applications. It runs on Linux, Windows through WSL, and macOS, with self-hosted deployment and source code released under GPL version 2. Rather than presenting a packaged desktop interface, OpenLB provides models and programming interfaces that developers compile and extend for their own simulation workflows. Its scope covers fluid-flow CFD along with multiphase, particle, thermal, and electrochemical models.

The library’s strongest fit is for teams that need controllable parallel execution. MPI supports distributed-memory runs, while OpenMP and SIMD address shared-memory and vectorized execution; GPU support is also available. Geometry work can start from STL voxelization or primitives such as cuboids, spheres, and cylinders, and boundary-condition setup is included. Serial and parallel checkpointing help preserve simulation state, while VTK output connects results to external visualization and analysis. This combination gives developers a foundation for building specialized solvers rather than a fixed, point-and-click workflow.

OpenLB suits small research groups through enterprise engineering teams that have C++ and computational modeling expertise available. The open-source model avoids software license fees, and the project provides community, documentation, and email support channels; the consortium also offers paid support and services. Developers seeking an extensible lattice-Boltzmann codebase should find its modular design and multiphysics coverage relevant. Teams wanting a hosted application, a packaged graphical workflow, or methods outside the lattice-Boltzmann family should consider a different CFD platform.

OpenLB pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on openlb.net

OpenLB fact sheet

Free plan	Yes
Paid from	None
Deployment	Desktop
Multiphysics solver	Yes
Built-in meshing	Yes
CAD import	Yes
Parallel cores	Not verified
Operating systems	Linux, Windows (via WSL), macOS
Deployment	Self-hosted
Platforms	Linux, Windows, macOS
Support	Community, Docs, Email
Built for	Small business, Mid-market, Enterprise (editorial estimate)
Integrations	1 integrations: ParaView
Pricing	Free plan
Website	openlb.net
Facts checked	24 Sep 2026

OpenLB integrations

OpenLB lists 1 integrations on its own site.

ParaView

Alternatives to OpenLB

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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