XFlow is a particle-based Lattice Boltzmann technology solver for high fidelity Computational Fluid Dynamics (CFD) applications. It offers multiphase and moving parts modeling capabilities with a special focus on lubrication workflows. XFlow features automatic lattice generation, GPU computing, and advanced rendering capabilities.

Irrespective of the system complexity, gear types, and lubrication methods, XFlow provides detailed insights into the system's performance. Lubrication simulation can reduce the number of physical tests and offers quantitative predictions for results like wetted area and churning losses that can be challenging to measure experimentally.

Automatic lattice generation in XFlow minimizes user inputs, reducing time and effort in the meshing and pre-processing phase. XFlow provides comprehensive GPU computing support to expedite the solution time. Problem setup and results exploration are easy and intuitive, enabling users to focus their efforts on design iteration and optimization. In addition, advanced rendering capabilities provide realistic visualization to gain deeper insight into flow performance.

The state-of-the-art technology of XFlow for lubrication enables users to address other related CFD workflows involving high-frequency transient simulations with real moving geometries, complex multiphase flows, and free surface flows.

Beyond Lattice Boltzmann

In non-equilibrium statistical mechanics, the Boltzmann equation describes the behavior of a gas modeled at a mesoscopic scale. Unlike standard Multiple Relaxation Time (MRT), XFlow implements the scattering operator in central moment space, which naturally enhances the Galilean invariance, accuracy, and stability of the code.

Particle-Based Kinetic Solver

XFlow features a novel particle-based kinetic algorithm that is designed to work quickly with accessible hardware. The discretization approach in XFlow avoids the classic domain meshing process and the surface complexity is not a limiting factor anymore. The user can control the level of detail of the underlying lattice with a small set of parameters. The lattice is tolerant to the quality of the input geometry and adapts to the presence of moving parts.

Turbulence Modeling: High Fidelity WMLES

XFlow features the highest fidelity Wall-Modeled Large Eddy Simulation (WMLES) approach to turbulence modeling.

The underlying state-of-the-art LES, based on the Wall-Adapting Local Eddy (WALE) viscosity model, provides a consistent local eddy-viscosity and near-wall behavior. It also performs in CPU-times similar to most codes providing just Reynolds-Averaged Navier-Stokes (RANS) analysis.

XFlow uses a unified non-equilibrium wall function for simulating the boundary layer, which is suitable for most scenarios. The wall function simplifies the user's experience by eliminating the need to choose from various models and handle their associated limitations.

XFlow Key Features

XFlow 2023 includes the following features and enhancements:

  • XFlow supports the use of multiresolution boosting the simulation performance.
  • The ability to output surface fields, such as heat transfer coefficients, on moving geometries enables the thermal analysis of gearbox components
  • Accurate torque prediction for churning losses estimation.
  • Ability to plot pressure and viscous force/moment contributions separately.
  • XFlow supports the use of NVIDIA GPU cards with both Linux and Windows operating systems.
  • XFlow supports the use AMD GPU cards with Linux operating systems.
  • Ability to compute the time averaged data from a starting time step.
  • Reduced storage requirements by the ability to save a specific scalar, surface and volumetric fields as either instantaneous values, averaged values or both.
  • Optimized GPU memory consumption in cases with moving parts or multi-resolution.
  • Support for new SIMULIA Unified licenses (SIMUNIT) that allow running any SIMULIA products with the same license: Tokens and Credits.
    • Tokens: allocated during use and released after use.
    • Credits: consumed during the use.
  • XFlow System Requirements and Licensing

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