Frequency-Stationary
The Frequency-Stationary study is a dedicated study step to use when the Acoustic Streaming Boundary Coupling or Acoustic Streaming Domain Coupling is used to couple an acoustic frequency domain interface to a stationary fluid flow interface. The study uses a tailored solver that solves for the acoustic fields and stationary fields in the same study step.
Physics and Variables Selection
In the Physics and Variables Selection under the study step the equation form of the acoustic interface is designated a Automatic (Frequency Domain), the stationary interfaces is set to Automatic (Stationary), and the two acoustic streaming multiphysics couplings are set to Automatic (Frequency-stationary).
The Frequency-Stationary study step requires an Acoustics Module license. The study step is only possible to select and use together with the multiphysics couplings Acoustic Streaming Boundary Coupling or Acoustic Streaming Domain Coupling.
Frequency-Stationary in the COMSOL Multiphysics Reference Manual