Opaque Surface (Radiative Beam in Absorbing Medium Interface)
Use this node to set an absorbing medium’s boundary opaque to radiation. This condition applies to all the radiative beams defined by an active Incident Intensity condition. If the beam propagates from the opaque surface to the absorbing medium, the radiative intensity is set to 0. Otherwise, the radiative beam is absorbed by the surface and deposits all its energy on it. A boundary heat source, Qb, is defined and corresponds to the energy deposited by the entire radiative beam on the opaque surface. See Absorbing Medium (Radiative Beam in Absorbing Medium Interface) for modeling the absorption of the radiative beam in the medium.
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Physics Tab with Radiative Beam in Absorbing Media selected: