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Multi-physics, Conjugate Heat Transfer

Multi-physics Conjugate Heat Transfer

 

fluidyn-MP CHT (Conjugate Heat Transfer) is fully embedded in fluidyn-MP interface, for an easy-to-use work environment for any engineer.It offers an optimized CFD, structure and thermal 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 solutions for thermal analysis in structures. The coupling between both structure and fluid domain are performed directly in fluidyn-MP. Coupling scheme between fluid and structure for thermal are specific and optimized for convection heat transfer and complex non-conformal mesh interactions.

 

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. Convectionand 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 while 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 (Computer 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).

 

Thermal Solver

 

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

  • Conduction in structures

  • Boundary conditions: Loads on surface:

    • Convective : internal interaction with fluid flow

    • Convective : external natural or forced convection condition

    • InternalRadiative coupling with fluid

    • External Radiative conditions. Interaction with other solids and/or surfaces (view factors computations in anyreference frame)

    • Coupled conditions

    • User-coded conditions

  • Loads

    • Node temperature,

    • Flux,

    • Nodal sources /elements

 

fluidyn-MP CHTsolver 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

Multi-physics Conjugate Heat Transfer

 

Flier : fluidyn-MP CHT