XFlow

High fidelity CFD based on Lattice-Boltzmann Method

Co-simulations with Abaqus

XFlow and Abaqus co-simulations for advanced Fluid Structure Interaction (FSI) analysis:

  • Mutual exchange of information automatically performed by the Co-simulation Engine
  • The co-simulation interface region is a surface where the coupling acts.
  • XFlow treats the interface region as a solid moving boundary where the no-slip condition must be enforced
  • Abaqus requires the external fluid loads acting on the surface of the interface region

Co-simulation with Simpack via FMI standard

CFD and Multibody Dynamic (MBD) co-simulations via Functional Mock-up Interface (FMI) standard:

  • FMI is an independent standard to support co-simulation of dynamic models
  • Master (Simpack)-Slave (XFlow) configuration with data exchange between subsystems restricted to discrete communication points
  • Application: Vehicle control under side-wind effects
    •  XFlow provides Simpack with the aerodynamic forces affecting the bodies
    •  Simpack performs the multi-body simulation and runs the control system

Direct support of CATIA parts

  • Integration of Spatial 3D library to support CATIA’s CATPart and CATProduct directly in XFlow
  • This Library allows also to support many other native CAD formats
  • Reduce requirements for CAD healing and defeaturing operations
  • A great step forward in reducing the CAD-to-CFD time

CST-XFlow one-way coupling

Two features have been implemented in order to allow importing CST STUDIO SUITE data to XFlow:

  • External VTK/VTU mesh data can be interpolated and read by XFlow
  • A new Volumetric Heat Source condition can now be applied to the entire fluid domain as a user-defined law

These two features allow the user to export to VTK/VTU format the energy scalar field from CST
simulation and use it as Volumetric heat source in XFlow.

Multiphase Volume of Fluid (VoF) solver

  • New Volume of Fluid (VoF) multiphase solver to complement the already existing Particle-Based Tracking and Phase field multiphase solvers.
  • This VoF solver is more adapted to large scale multiphase applications such as:
    • Tank sloshing
    • Dam break

Animated geometry behavior for simplified FSI analysis

Simplified approach to FSI analysis where:

  • Solid deformation is defined by a sequence of geometries representing a predefined deformation
  • The geometry deformation animation drives the fluid flow simulation

New thermal boundary conditions

  • Temperature Jump boundary condition that can be applied through a surface or a volume
  • Convection Radiation boundary condition to apply a heat flux resultant from a surrounding
    temperature and a heat flux coefficient
  • Volume Heat Source boundary condition, available for porous volumes only, to model radiators and heat exchanger behavior