![]() ![]() You can see this functionality used in the following models: The Port condition can also be used as a source to just excite a system with a specific mode. The Port condition allows for automatic S-parameter (scattering parameter) calculation and has built-in postprocessing variables to easily compute the transmission loss (TL) or the insertion loss (IL). In many cases, using the new Port condition provides superior ease of use and accuracy compared to a plane-wave radiation condition or a perfectly matched layer (PML) configuration. In essence, this represents a multimode expansion of the solution. By including all relevant propagating modes in the studied frequency range, the port conditions provide a near-perfect, nonreflecting radiation condition for waveguides. ![]() To provide the full acoustic description at a waveguide inlet/outlet, you can combine several port conditions on the same boundary. The condition is available in the Pressure Acoustics, Frequency Domain interface. The new Port boundary condition is used to excite and absorb acoustic waves that enter or leave waveguide structures, like ducts and channels. ![]() Read about these and many more Acoustics Module updates below. For users of the Acoustics Module, COMSOL Multiphysics ® version 5.4 includes the Port boundary condition for pressure acoustics, the nonlinear acoustics Westervelt model, and atmosphere and attenuation models. ![]()
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