Advanced Multiphysics Modelling Capabilities

Multiphysics simulations are numeric models that involve coupled multiple physical processes. Modelling using the Finite Element (FE) Analysis is one of the most numerically efficient ways to solve the partial differential equations (PDEs) that describe physical phenomena.  FE is particularly powerful when it comes to studying phenomena involving complex interactions between two or more physical processes.

The principal modelling package used by Xi Engineering is COMSOL Multiphysics, for which Xi are recognised internationally as COMSOL Certified Consultants. COMSOL provides a true Multiphysics environment providing the ability to fully couple different physical phenomena to simulated complex behaviour.  Common multiphysics models produced by Xi include, acoustic-structural dynamics, acoustic-MEMS, structural dynamics-fluid flow, electrostatic-structural-acoustic and electromagnetic-structural dynamics.

An example of multiphysics simulation created by Xi is the model of electrostatic headphones. Electrostatic speakers work by driving a changed elastic membrane between two parallel conductive wire meshes to which an AC signal is applied.  The forces on the membrane vary the AC signal level and with distance to the wire mesh which in turn is dependent on the elasticity of the membrane and internal stresses.  The external load of the air on the membrane and visco-thermal losses further complicate the dynamics.  In order to solve these interrelated physics, a true multiphysics approach is required that couples structural dynamics, electrostatics and acoustics.