PMLs enable you to truncate the computational domain with an external layer that mimics waves moving into an infinite domain. PMLs are often used in situations where the default first-order, nonreflective boundary conditions would generate spurious and unwanted numerical reflections. Perfectly Matched Layers for the Pressure Acoustics, Transient Interface Beam width calculations for far-field plots.Improved ray acoustics formulation in 2D axisymmetric geometries.New interior Perforated plate condition.Biot-Allard model to include thermal and viscous losses in poroelastic wave simulations.2D axisymmetric formulation in the Convected Wave Equation interface.Improved formulation for the Slip boundary condition in Wall features for linearized Navier-Stokes and thermoviscous acoustics applications this works very efficiently when using iterative solvers.New and improved stabilization techniques for linearized Navier-Stokes analyses that are based on the Galerkin least squares (GLS) method.New physics features and options include: Ready-to-use suggested solver options for iterative solvers.Large models benefit from the following new features: Speedup to the discontinuous Galerkin (dG) method.

Transient solver settings being controlled at the physics level for more robust simulations.The Thermoviscous Acoustics, Transient interface for the time domain.Perfectly matched layers (PMLs) for pressure acoustics in the time domain.In summary, improvements to time-domain simulations include: Further improvements include an array of new physics features and options as well as new postprocessing tools. COMSOLВ Multiphysics В® version 5.3 introduces new Acoustics Module functionality that greatly improves time-domain simulations of acoustics phenomena and facilitates solving large acoustics-based models.

Comsol 5.3 stokes flow