OMNIS™/LB

Solutions for complex internal and external flows

NUMECA’s OMNIS™/LB, developed with FlowKit - a NUMECA company - offers Lattice-Boltzmann CFD technology based on a mesoscopic fluid description as an ensemble of colliding pseudo-molecules.

This Lattice Boltzmann method has been shown to provide attractive modeling capabilities, particularly for external unsteady low speed flows at the VLES level, based on various Wall Modeled LES (WMLES) implementations. 

In other areas related to more complex flows such as transonic and supersonic flows,  multi-phase and multi-fluid physics, many challenges appear to be originating from the difficulty to find an appropriate collision operator describing the targeted physics. 

As a consequence, a fundamental research effort is still necessary to bring the Lattice Boltzmann method to industry standards in terms of accuracy and reliability of the  physical models.

To support these research efforts, NUMECA makes its LB technology available as an open source software and provides the scientific community the possibility to contribute to these challenges and develop their own advanced models. 

The open source version can be combined with the OMNIS™ environment, allowing users to take advantage of the same streamlined workflow, CAD tools etc... as other integrated NUMECA tools do. 

Contact us for more information.


Multiphase flows and VoF modeling

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

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

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

Applications

  • 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

OMNIS™/Post:

  • 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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