Computational Fluid Dynamics (CFD)

Computational Fluid Dynamics (CFD)

Computational Fluid Dynamics (CFD) is a group of numerical methods used to simulate the mechanical behavior of fluid.

Today, with the development of computational power ressources, it is possible to simulate relatively complex problems while limiting CPU time. Thus, the CFD is an essential tool for the engineer for design, optimization or development stages of an innovative processes or physical analysis of complex phenomena involving fluids.

The fields of application of CFD are many and varied:

  • Nuclear reactor core cooling calculations.
  • Aerodynamic and hydrodynamic calculations (drag, lift, yaw…).
  • Pressure drops calculations.
  • Cooling of electronic components calculations, buildings efficiency and thermal comfort.
  • Species transport calculations (concentration monitoring, dilution, aerosol …).
  • Calculations of subsonic, sonic or supersonic flows (turbomachines, jets ..).
  • Combustion calculations …

The realization and validation of a fluid mechanics simulation requires a thorough expertise of each stage of the modeling process. Our team of specialist engineers master all of these steps:

  • Mesh choice (choice of the type of elements, characteristics, sizes, skewness, ratio of non-orthogonality, etc.) conditioning the validity and the robustness of the computation.
  • Physics involved (choice of adapted boundary conditions, turbulence models in agreement with the studied phenomenon).
  • Solver and numerical settings (pressure / velocity coupling algorithm, discretization schemes …).

  • Postprocessing of the output results (temperature fields, velocity field, local exchange coefficient, scalar concentration, pressure drop …).

In our calculations methodologies, we attach a particular importance to the validation step. We thus systematically carry out mesh sensitivity, turbulence and solver’s settings and perform, if necessary, validation benchmarks for the calculation code used.

Large Eddy Simulation (CFD) analysis of a wind turbine

Our numerical tools

Our skills in Computational Fluid Dynamics

  • Steady-state and transient flows.
  • External or internal.
  • RANS, DES or LES approach.
  • N-phases flows
  • Rotating machinery and dynamic meshs.
  • Thermals and mechanicals coupling.