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fluidyn-MP CHT









fluidyn-MP CHT is fully embedded in fluidyn-MP interface, for an easy-to-use environment for any engineer. 


It is an optimized CFD and thermal/structure coupling for general Conjugate Heat Transfer applications. It namely uses Finite Volume methods for fluid flow analysis as described in fluidyn-MP NS, and Finite Element solvers for thermal analysis in structures. The coupling between both structure and fluid domain, including the effect of structural deformation on heat transfer coefficient, is done automatically. The heat transfer calculation remains exact, even though structure may have deformed significantly as mesh and boundary layer flow for fluids, are reevaluated periodically with a non-conformal mesh interface between the two.


The fluid region is meshed with 3D elements (finite volume formulation) and all the features of the fluidyn-MP NS code are available in the fluid domain. The structural region of interest is meshed with 1D, 2D or 3D finite elements and this allows analysis of heat conduction in solids due to the heat transfer from or to the surrounding fluid for complex geometries. Convection and radiation in fluid domain are treated with one of the Finite Volume schemes chosen according to the flow type: compressible, incompressible, reactive, etc. Dynamically changing convection boundary condition is considered implicitly at the Fluid-Structure interface for the structure.


Thermal radiation is modelled for transparent media. 3D view factors are automatically calculated whileCHT_Ailettes_fluid1.JPG considering the shadow effect of all the intermediate obstacles. Thermal only or Thermo-mechanical problems (without fluid) can be treated as well.


The CAD and mesh generation is similar to fluidyn-MP NS, and is done via fluidyn-CAE. (Aided Engineering) and fluidyn-CADGEN.


The fluid mesh and structure (thermal) mesh can be imported separately or in one single block into fluidyn-MP CHT. A mesh menu is included which allows the user to do some mesh manipulation in GUI itself: separating meshes into fluid and structure, creating meshes by extrusion, rotations, copy, mirror, refine, etc..., and create the Fluid-Structure interfaces (partition).


fluidyn-MP CHT Solvers:

Thermal solver

For thermal solver, the user can solve following thermal problems, through a Finite Element resolution:

  • Conduction in structures
  • Boundary conditions: loads on surface 
         o     Convective : internal interaction with fluid flow
         o     Convective : external natural or forced convection condition
         o      Internal  Radiative coupling with fluid
        o     External Radiative conditions. Interaction with other solids and/or surfaces (view factors computations in any  reference frame)
         o     Coupled conditions
         o     User-coded conditions
  • Loads
          o     Node temperature, 
          o     Flux, 
          o     Nodal sources /elements


Thermal Solver is a Finite Element code for thermal transient analysis. The following types of analysis are possible:

  • Explicit Transient
  • Implicit Transient
  • Steady state
  • The element library includes 2-noded beam, 3-noded shell element, 4-noded tetrahedral, 5-noded pyramid, 6-noded wedge, and 8-noded hexahedral elements. The material properties may be constant or temperature dependent, isotropic or orthotropic. For solution of problems of large size, out-of-core technique is employed to overcome memory constraint for matrix storage. 


Fluid solver

The fluid solver is same as that described above under the name.
Integrated fluid solution: Thermal analysis integrally coupled with
fluidyn-MP NS.



fluidyn-MP CHT Applications:

fluidyn-MP CHT has many applications all industrrial fields (link), especially Automotive, Nuclear,  Petro-chemical & Process industry, besides for Aerospace and defence. Examples are given hereafter:

  • Heat exchangers
  • Transports in pipes, leakage impact analysis. 
                 o     LNG transport
                 o     Gas transport
                 o     Supercritical CO2 transport 
  • Heat and Mass transfer in soils
  • Nuclear Thermohydraulics

Other applications:

  • Neutron beam
  • Electrochemical coupling
  • Sensors 
  • Non-equilibruim models (porous structures)
  • Radiative heat transfers



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