When the flow Compressibility is set to Incompressible flow, the Nonisothermal Flow coupling follows the Boussinesq approximation and evaluates the thermal material properties at the reference temperature define in the heat transfer interface. Hence, the Phase Change Material domain model — which requires the temperature dependency of the heat capacity — should be added under Fluid only with the Weakly compressible flow and Compressible flow (Ma<0.3) options.
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When the Nonisothermal Flow and Conjugate Heat Transfer interfaces couple a turbulent flow with a Phase Change Material domain model, it must be noted that only the geometry boundaries are considered for the definition of the wall functions and of the wall distance. For example, at the moving melting front between the solid and the liquid phase, no wall functions are used by the k-ε and k-ω turbulence models.
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See also Heat Transfer and Fluid Flow Coupling for more information.
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