Use the Low-Reflecting Boundary node to let waves pass out from the model without reflection in time-dependent or frequency domain analysis. As a default, it takes material data from the domain in an attempt to create a perfect impedance match for both pressure waves and shear waves. It can be sensitive to the direction of the incoming wave.
The Low-Reflecting Boundary node is only available with some COMSOL products (see
http://www.comsol.com/products/specifications/).
Select a Damping type —
P and S waves or
User defined. For
User defined enter values or expressions for the
Mechanical impedance di. The defaults for all values are
0.5*solid.rho*(solid.cp+solid.cs).
