A first-in-class Simulation Platform for Complex Multiphase Flow

TransAT© is a versatile fluid-flow simulation platform (CFD/CMFD) using the Immersed Surfaces Technology for multi-dimensional meshing

The platform is particularly suitable for multiphase flows using tailored predictive techniques augmented by a wide-range of models accounting for complex physics

TransAT can be deployed under Linux and Windows operating systems, and is parallelized using MPI parallel protocol for HPC infinite-band systems

TransAT can be employed in various engineering verticals, including oil & gas, energy systems, chemical and process engineering, hydraulics and waste water, transportation and environment

Core Features

Immersed surfaces meshing

Transorming stl CAD files into solid level-set functions immersed into Cartesian grids with block refinement

Basic model portfolio

RANS and LES/V-LES approaches, convective-radiative heat transfer, reactive flows, mass transfer

All-speed formulation

Handling both incompressible & compressible flows, with possible extention to multiphase flows

Embedded  sources modelling

Embedded mass, momentum and heat sources, including jets, rotating fans, fire and smoke spots

Rigid body motion

Supports using UDF the specification of motion to solid objects for up to six DOF without re-meshing

Advanced model portfolio

Porous media, combustion, visco-elasticity, shear thinning, flocculation, ozonation, erosion, miscibility

Scalable HPC

High MPI-based parallel efficiency breaking up the 95% scaling up to 10K cores & 15K cells per core

Comprehensive UDF framework

A set of UDFs  for most of the single- & multiphase physics, with a comprehensive template library

State-of-the-art features

Axisymmetry, swirling & buoyancy, rotating frame of reference, advanced initial conditions, periodicity

Download TransAT - get started

The new desktop version of TransAT Suite – with the modules HPC, Multiphase and Multiphysics- is now available for download. The in-built demo license allows running simulations for 1 hour using maximum 4 processors

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Multiphase Features


Fluid-fluid interfaces


Particle & droplets flows


Gas-liquid mixtures


Granular flows


N-Phase Systems


Boiling & condensation

Advanced Physics


Gas hydrates


Bedload transport


Interphase mass transfer


Viscoelastic multiphase flows



Multiphase compressibility