Aeroacoustic Flow Source
The Aeroacoustic Flow Source feature is used to set up aeroacoustic flow-induced noise sources in the pressure acoustics model. The feature is best used when coupling an LES fluid flow model to the Aeroacoustic Flow Source feature using the Aeroacoustic Flow Source Coupling multiphysics coupling and the dedicated Transient Mapping study. The feature only exists in 3D. The feature can also be used with user-defined expressions for a Lighthill like source expressed in terms of a stress tensor Tij (SI unit: N/m2). Add this node from the More submenu.
Aeroacoustic Flow Source
Select the Acoustic analogy as Lighthill (the default) or Aeroacoustic wave equation. The selection should match the option in the Aeroacoustic Flow Source Coupling multiphysics coupling. When the multiphysics coupling is used, the Stress tensor (T), Normal mass flow on exterior boundaries (mn), or the Flow pressure variation, second time derivative () field are automatically coupled. If user-defined expressions are selected, enter an expression. The user-defined expressions correspond to the Fourier components of the different flow sources terms.
Cavity Flow Noise tutorial available in the COMSOL Application Gallery at: https://www.comsol.com/model/cavity-flow-noise-105021
Best practices for modeling with the Aeroacoustic Flow Source and the associated multiphysics functionality is presented in the Modeling with the Aeroacoustic Flow Source: Flow-Induced Noise section.