Comsol 5.3 passcode simulator#

Sometimes, multiphysics problems can be solved with one numerical method, but are optimally solved using different numerical methods - the boundary element method (BEM) and finite element method (FEM) - for the different physics. The model now uses the Stationary Source Sweep study step, which provides a far faster solution.Īpplication Library path for an example using the Stationary Source Sweep study step: ACDC_Module/Applications/touchscreen_simulator Solver Support for Hybrid BEM/FEM Problems

Comsol 5.3 passcode simulator#

The image shows the underlying model used to build the Touchscreen Simulator app. The position and orientation of the finger are controlled via input parameters and the resulting capacitance matrix is evaluated. The Touchscreen Simulator application in the AC/DC Module Application Library computes the capacitance matrix of a touchscreen in the presence of a human finger, represented by a phantom.

The speed when using an iterative solver has also been improved. For direct solvers, it reuses the LU decomposition of the system matrix, making it several times faster than the previous port sweep implementation. Using the boundary element method for this simulation negates the need for defining a finite modeling domain and boundary as well as meshing the thin volume of the capacitor.Īpplication Library path for an example using the Electrostatics, Boundary Elements interface: ACDC_Module/Capacitive_Devices/capacitor_tunable New Study Step: Stationary Source SweepĪ new Stationary Source Sweep custom study is available for faster calculation of lumped parameters in the Electrostatics, Electric Currents and Electrostatics, Boundary Elements interfaces. The electric field and potential are shown as an arrow plot, while the induced surface charge density is plotted on the electrode surfaces. The electrostatic behavior of a tunable capacitor modeled using boundary elements. As an example, you could use a combination of the two interfaces to include the effects of an infinite space instead of using the Infinite Element Domain feature. The Electrostatics, Boundary Elements interface can also be combined with the finite-element-based Electrostatics interface, using the Boundary Electric Potential Coupling multiphysics node. Note that the electric potential distribution on the boundaries must be explicitly defined, so you need constant material data within the domains. This new interface can be used as an alternative to the Electrostatics interface for computing the potential distribution in dielectrics, and is particularly convenient for structures that are difficult to mesh. The physics interface, available in 2D and 3D, solves Laplace's equation for the electric potential using the scalar electric potential as the dependent variable. The formulation is based on the boundary element method (BEM). The new Electrostatics, Boundary Elements interface has been developed for building and running models that are not well suited for the finite element method (FEM).

New Physics Interface: Electrostatics, Boundary Elements

Review all of the AC/DC Module updates in more detail below. For users of the AC/DC Module, COMSOL Multiphysics ® version 5.3 brings a new Electrostatics, Boundary Elements physics interface, a new Stationary Source Sweep study step, and several new tutorial models.