AVBP-AVTP-PRISSMA Coupling with OpenPALM

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Some details you have to be aware of

A coupled simulation involve different codes that exchange data in order to improve physical predictions. For aerothermal computations with fluid dynamics, conduction and radiation, the type of exchange data are:

• Fluid <-> Conduction: boundary conditions
• Fluid <-> Radiation: volumic source terms
• Radiation <-> Conduction: boundary conditions

The choice of the boundary condition for conjugate heat transfer have an impact on the stability of the numerical problem. It is then recommanded to:

• Impose the temperature of the solid solver to the fluid one,
• Impose the heat flux of the fluid solver to the solid one.

Thus, you have to choose adequate boundary conditions for AVBP and AVTP. For example:

• AVBP: WALL_NOSLIP_ISOT, WALL_NOSLIP_RELAX_T, WALL_NOSLIP_LOSS, WALL_NOSLIP_CTHFLUX, WALL_WAVE_NOSLIP_ISOT, WALL_LAW(_COUPLED)_ISOT ...
• AVTP: WALL_FLUX, WALL_TEMP_FLUX

In order to ensure that heat fluxes at the wall are available for coupling, you have to turn on the istoreadd parameter in the run.dat file of AVBP to 3.

When radiation is involved in the coupled problem, the only choice consists in:

• Impose the temperature of the solid solver to the radiation one,
• Impose the heat flux of the radiation solver to the solid one,
• Impose the composition of the fluid mixture as well as its temperature and pressure to the radiation solver,
• Impose the radiation source term in the energy equation of the fluid solver.

Thus, for radiation coupling, there are just two things to be aware of: the boundary condition of the thermal solver AVTP must be as described for the fluid/solid coupling (imposition of a flux like condition), and the the radition model in the input_radiation.dat of AVBP must be 2 (for coupled model).

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