Therefore, the denser the chosen grid, the smaller the usable time step width. This value of the maximum usable time step is directly related to the minimum mesh step width used in the discretization of the structure. It is proven that this method remains stable if the step width for the integration does not overcome a known limit.
The Transient solver based on the Finite Integration Technique (FIT) calculates the fields step by step through time by the Leap-Frog updating scheme. The logfile contains information about solver settings, mesh summary, solver results and solver statistics. Old results of the same time domain solver will not be deleted as long as they are not effected by a change of the time domain solver settings, the time domain solver parameters, the source definitions or any change in the modeled structure.Īfter the solver has finished you can view the logfile by selecting Post-Processing: Manage Results > Logfile. To start the solver, all results of other solvers (frequency domain solver, eigenmode solver, etc.) will initially be deleted. Or with some selected (or all) ports stimulated simultaneously. With some selected ports stimulated sequentially, If there are multiple ports defined, these ports may be stimulated in four different ways if you start the solver: You can start the solver Both time domain solvers can be started from the Time Domain Solver Parameters dialog box, where the mesh type can be selected either as Hexahedral or as Hehahedral TLM to activate the Transient or TLM solver, respectively.Ī solver run can only be started if at least one port or some other excitation source as plane wave or a far- or near-field source is defined. See the Time Domain Solver Settings Overview for details. Simulation of dispersive materials (see material overview)īefore you start the solver, you should make all necessary settings. Radar cross section calculations using farfield/RCS monitors (see farfield calculation overview and monitors) Structure design by using the optimizer or the parameter sweep Signal analysis such as rise times, cross talks etc. Scattering parameter matrices (S-Parameter)Įlectromagnetic field distributions at various frequencies (see monitors)Īntenna radiation patterns and relevant antenna parameters (see monitors) Both solvers work on hexahedral grids, however, the mesh setup is slightly different and classified as Hexahedral and Hexahedral TLM mesh type, respectively. One is based on the Finite Integration Technique (FIT), just called Transient solver, the second one is based on the Transmission Line Method (TLM) and is referred to as TLM solver. In CST Studio Suite® two high frequency time domain solvers are available. and can obtain the entire broadband frequency behavior of the simulated device from a single calculation run. Consequently a time domain solver is remarkably efficient for most high frequency applications such as connectors, transmission lines, filters, antennas etc. It calculates the transmission of energy between various ports or other excitation sources and/or open space of the investigated structure. Time Domain Solver Overview Time Domain Solver Overview A time domain solver calculates the development of fields through time at discrete locations and at discrete time samples.