Mapped Room Coupling
Use the Mapped Room Coupling node to couple two rooms when they do not share a common inner boundary. This is, for example, necessary if mid-planes have not been added in the CAD drawing. The condition has the same functionality as the Room Coupling feature except that a mapping is used between the source and destination walls.
Transmission Loss
How you define the transmission loss depends on the choice of Band Input Type for The Acoustic Diffusion Equation.
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If the Band Input Type is Flat (continuous) enter a Transmission loss TL (SI unit: dB).
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For Octave bands, 1/3 octave bands, or User defined bands, enter a Transmission loss TL (SI unit: dB) in each row corresponding to the Band Number.
Continuity
Select the Force continuity checkbox to ensure continuity resulting in a zero transmission loss.
To display the Constraint Settings, Orientation of Source, Orientation of Destination, and Mapping Between Source and Destination sections, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog.
For details see Constraint Settings, Orientation of Source and Destination, and Mapping Between Source and Destination in the COMSOL Multiphysics Reference Manual.