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In COMSOL Multiphysics® version 6.4, the Radiation in Participating Media and Radiation in Absorbing–Scattering Media interfaces, when solved with the discrete ordinates method, use a new lumped Jacobian approach and a new default solver. Additionally, some options related to the solver sequence have been deprecated (Performance index) or modified (Use alternative solver with stabilization). The resulting solver of API scripts will thus be in a different state than before. If further manual changes to the solver sequence were made, the scripts may fail.
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In the Radiation in Participating Media and Radiation in Absorbing–Scattering Media interfaces, the Semitransparent Surface feature has been deprecated when the P1 approximation is used. If a Semitransparent Surface condition is necessary for the model, it is recommended to switch the Radiation discretization method to Discrete ordinates method. Backward compatibility is ensured for models in version 6.3 and earlier, but API code must be updated for the semitransparent condition to be active.
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The External Temperature subnode available for the Thin Layer, Thin Film, and Fracture features has been extended for the Thermally thin approximation. Note that this configuration was already possible in version 6.3 for the Thin Layer feature. Backward compatibility with models created in previous versions is ensured. Some API scripts need to be updated to achieve the same behavior as in previous versions since External Temperature may now be active when it was not in previous versions.
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