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Nuclear Sector Consultancy


Fluidyn sector's - Nuclear Sector Consultancy


FLUIDYN has developed specific tools for applications in Nuclear sector using its experience in 3D Fluid Mechanics of the past 20 years. fluidyn-MP numerical platform is used for several nuclear applications, and contains following features:

  • General fluid flow with thermodynamic models built-in for steam-water saturated mixture and compressible water
  • Higher order TVD based convection schemes for reduced numerical diffusion and accurate predictions of pressure losses in internal flows
  • Selection of explicit/semi-implicit/fully-implicit procedures for different applications
  • Explicit time-marching schemes for fast transients
  • Semi-implicit and implicit schemes for slow transients
  • Conjugate heat transfer (CHT) capability for all three modes of heat transfer in solids and fluids is an extremely useful tool for thermal analysis of steam generators, heat exchangers and other reactor components
  • The fluid-structure interaction (FSI) module can be used to analyse structural deformations due to accidents, rupture, flow-induced vibration, etc in a coupled manner where the structural movement and the fluid flow are computed together
  • High deformations induced by rupture in the recirculation pipe and propagation of the acoustic wave can be easily analysed

These general features, fully available through fluidyn-MP GUI, are used for :


General process engineering and risk analysis


Risk analysis and process engineering are two closely related fields for nuclear applications. Both extensively use the CFD and fluid-structure interaction of the fluidyn-MP platform :

- CAE : Computed Aided Engineering for all applications

- Single phase and multi-phase flow analysis

- Structure analysis (stress/deformations)

- Rupture analysis

- Leakage/ LOCA applications

- Coupled acoustic flows


Some specific extensions of models are implemented into the fluidyn-MP platform for following applications:




fluidyn-MP's Thermo hydraulic module is a full 3D simulator, for robust and accurate modeling of flows in reactors, pipes, vessels, etc... In stationary and/or transient (accidental conditions). It includes :

  • HEM models validated for high performance computations
  • Adapted models for turbulent flows
  • Bulk and film condensation
  • Heat exchange through structures for accurate modeling
  • Available results on THAI, PANDA and other benchmarks for thermo hydraulics


fluidyn-MP's MHD module allows to perform fluid flow of electro conducting fluids in a electromagnetic environment. MHD is used for nuclear applications, especially for primary coolant system, where an electro conducting fluid is used as fluid coolant. FLUIDYN is part of ITER blanket breeder system verification and validation through numerical simulation. MHD module integrates (highlights):

  • Both potential and induction method for MHD flow solution
  • Full validation for flow in ducts, up to Ha > 30000
  • Modelling of fluid domain and structure domain


MHD Flows


Waste storage
FLUIDYN has been developing and validating unsaturated flow and thermal coupled modelling in soils for application to deep nuclear waste storage, taking into account:
  • Capillary pressure - desaturation
  • Saturation/permeability relations : (Van Genuchten)
  • Water drift filling and emptying procedure
  • Coupled thermal expansion and pressure distribution in whole 3D domains


fluidyn-MP allows performing complex and accurate modelling of 3D fluid-structure dynamic load and structure dynamic response interaction due to diverse excitation phenomena, such as:

  • Static loads, mode analysis (structure alone)
  • Sloshing (3D fluid-structure coupling)
  • Hydrodynamic loads (condensation oscillations)
  • Seismic loads




fluidyn-MP models are an alternative for a better prediction of fluid-structure interaction in seismic impact modelling on structures.
Seismic Safety
Rarefied flows - Electromagnetism
FLUIDYN is involved in ITER R&D project through different types of analysis:
  • Vacuum Vessel leaks in tokamak. Modelling of the dense to rarefied flow dynamics transition in blankets
  • Electromagnetic forces modelling
  • MHD flows in Blanket breeder system






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