Physics

TransAT adopts the best-in-the-class models for the pertaining physics in CFD, be it for turbulence, multiphase flow, heat transfer, or complex physics fluids. The models are implemented in steady and unsteady modes, in both the modelling (e.g. K-e model) and the simulations contexts (e.g. LES).

Turbulence Modelling & Simulation

  • EVM: K-e based
    • High & Low-Re variants
    • Dynamic Two-layer models
    • Kato & Launder modification
    • Yap modification
    • Curvature modification
    • Adaptive Wall Functions
    • EASM Quadratic
    • EASM Cubic
    • EASM Quartic
    • Conjugate heat transfer
    • GGDH (anisotropic)
    • WET (anisotropic)
    • AFM model
  • LES, V-LES/DES:
    • Smagorinsky SGS model
    • Dynamic SGS model
    • WALE SGS model
    • Two-Equation Subscale for V-LES
    • One Equation Subscale for DLES

Multiphase flow

  • Mixture Modelling (N-phase approach)

    • Homogeneous
    • Algebraic slip
    • Pressure-gradient & gravity slip closure
    • Tomiyama drag & lift models
    • Turbulence dispersion
  • Interface Tracking Methods (ITM)

    • Level Sets
    • Fast Marching
    • VOF (with interface reconstruction; 3rd order)
    • Phase-Field
  • Eulerian Field Formulation

    • Single Class Suspended Particle Model
    • Multiple Class Suspended Particle Model
    • DQMOM
  • Eulerian-Lagrangian Modelling

    • One & two-way coupling
    • Heat transfer coupling
    • Particle-wall interactions
  • Dense Solid-Fluid Flow Systems

    • Particle-particle interaction (collision pressure)
    • Particle volume displacement
    • Four-way coupling
  • Multi-Component Flow Systems

    • Gas-Liquid-Solid-Particles-Droplets

Heat Transfer

  • Conductive & convective heat transport
  • Surface &  volumetric heat sources
  • Convective heat transfer models at boundaries
  • Anisotropic heat conduction
  • Boussinesq flows – including in turbulence equations
  • Conjugate heat transfer in 2D and 3D
  • Heat transfer with multiphase-flow
  • Variable thermo-mechanical properties of fluids (including super-critical fluids)
  • Advanced Equations of State (Peng & Robinson, Cubic Plus Association)
  • Radiation: Monte Carlo model
  • Radiation: Diffusive models
  • Radiation: Surface to surface transfer
  • Radiation for multiphase flow

Complex fluids & flows

  • Settling and sedimentation
  • Three- & four-phase flows
  • Non-Newtonian fluids (7 models)
  • Hydrocarbon constitutive laws
  • Binary mixtures
  • Porous media
  • Hydrate & slurries formation
  • Soret & Dufour effects

Reactive flows

  • EDC
  • EDC-SDT (Scalar Dissipation Timescale)
  • EDC-MTS (Multiple Timescale)
  • Arrhenius (volumetric and surface reaction)
  • Flamelet based on Mixture Fraction
  • Progress Variable & Scalar Dissipation Rate
  • DQMOM (in progress)
  • Evaluate thermodynamic and transport properties from CANTERA
  • Import Chemkin reaction mechanisms
  • Evaluate reaction rates
  • Pressure dependent reactions
  • Third body reaction
  • Surface reactions (heterogeneous)
  • Build Flamelet libraries

Microfluidics flows

  • Interfacial flow with heat & mass transfer
  • Phase change (boiling, condensation, evaporation)
  • Wetting: static & dynamic contact angle
  • Phase separation via phase field
  • Marangoni effects
  • Electrowetting Effects
  • Subgrid-scale thin-film & lubrication
  • Nano-particle tracking
  • Surface tension highly dominated flows

Fluid-structure interaction (FSI)

  • Rigid body motion
  • Solid-solid collision
  • Solid-wall collision
  • Imposed solid vibration & reaction to turbulence