Solutions for complex internal and external flows

NUMECA's OMNIS™/LB, developed with FlowKit - a NUMECA company - offers Lattice-Boltzmann method CFD simulation technology that opens the door to a new range of applications, including free surface flows in complicated configurations, porous media, multiphase flows, bodies with complex motions in close proximity, fluid-structure interaction or conjugate heat transfer (CHT).

The Lattice Boltzmann solver offers new levels of modeling capabilities for versatile, unsteady flows, at the LES level, based on various Wall Modeled LES (WMLES) implementations. 

The nature of the solver allows high parallel scalability on CPU and GPU, enabling high fidelity simulations on hundreds of millions of voxels in full unsteady mode, with overnight return time.

Solving the most complex physics and flows - meshfree


Complex geometries can be hard to mesh particularly for moving parts in contact or close to contact. OMNIS™/LB handles complex geometries on a mesoscopic scale without the burden of having to set-up and fine-tune a mesh.

Application examples:

Gearboxes, drivetrains, mixers, volumetric pumps, biofluids, porous media, splashing, dripping, sloshing, fluid membrane interaction, and many more…

Advanced multiphase flows and VoF modeling

OMNIS™/LB enables accurate representation of free surface flows with dedicated models for surface tension and contact angle. 

A dedicated model for Volume of Fluid (VoF) provides simulations with or without phase change and without the need to tune numerical parameters or produce complex meshes to capture the free surface

Application examples:

Tank sloshing, hydraulics, dam simulations, and many more...

Simulation of the flow of water in a river - with various banks geometries

Fluid-Structure Interaction

Washing machine

Sloshing liquid at zero gravity

Fluid-Structure Interaction (FSI) occurs when a fluid flow deforms a structure which in return influences the flow field.

OMNIS™/LB includes a dedicated model to compute Fluid-Structure Interaction for light materials and thin membrane deformation, accounting for elasticity and porosity of the material. 

In conjunction with the compressible supersonic capabilities, it can simulate parachute deployment in atmospheric entry conditions.

Compressible supersonic capabilities

OMNIS™/LB features compressible supersonic capabilities, with local Mach number up to 3.0.

Complex geometries in high speed environments can be handled seamlessly, and in conjunction with the Fluid Structure Interaction module for membrane deformation.

Parachute deployment in atmospheric entry conditions on Mars

Key features


  • Highly effective parallelization
  • Model highly complex geometries without meshing
  • Body-to-body motion
  • Gridless approach (Cartesian Grids with IBM, Bounce Back or Cut Cells)
  • Large number of physical models available
  • External and Internal Flows
  • Multi-layer grid refinement


  • Drivetrains, gearboxes, clutches, bearings
  • Volumetric pumps, mixers and blenders
  • Filters
  • Geophysical flows
  • Biofluids
  • Fluid-membrane interaction with large deformation
  • External aero

Modeling capabilities

  • Mesoscopic, fully transient modeling of complex fluid flows
  • Large eddy simulations
  • Free surface flow
  • Multi-component and multi-phase fluids
  • Conjugate heat transfer
  • Chemical reactions
  • Non-Newtonian rheology
  • Surface tension
  • Porous media
  • Ultra fast and automatic parallel octree mesh


  • Multi-projects and multi-views graphical user interface
  • Python scripting technology
  • Surface and 3D local value
  • Iso-lines
  • Color contour
  • Vector
  • Iso-surfaces
  • Cloud of particles
  • Line chart
  • Integral
  • Formula and operator derived quantities


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