Setting Boundary Conditions and Values

The only boundary specifications needed for this analysis are the temperature and radiation properties of the boundaries surrounding the solid region. The fin base will be assigned a temperature of 593 K, an emissivity of 0.5 and a reflectivity of 0.5. The solid-fluid interface will be assigned an emissivity of 0, a reflectivity of 0 and a transmissivity of 1. Kirchoff's Law (emissivity = absorptivity) is assumed by the solver and you should also check that, for each boundary or interface, emissivity + reflectivity + transmissivity = 1, as is the case here. Note that a transmissivity value can only be applied to interfaces.

The emissivity and reflectivity of the solid-fluid interface will be specified at the Fin-Interface [In-place 1] boundary, not at the Fin-Interface boundary as the latter became defunct when the interface was created (see Creating Interfaces in the Heated Fin Tutorial).

This has only changed the radiation properties on the solid side of the solid-fluid interface. We must now change them on the fluid side as well.

Specify the transmissivity of the interface:

Unlike the S2S radiation model employed in the Radiative Fin Tutorial, the DOM radiation model does not require radiation patches or view factors. Therefore, we can proceed to Setting Solver Parameters and Stopping Criteria.