Main Help → All Commands → MPM Analysis Header → TimeStep
The TimeStep
command selects the time per step in MPM analysis and the maximum time for the analysis. The format is:
TimeStep (timeStep),<(maxTime)>,<(timeFactor)>
where
(timeStep)
is the time step in alt time units. In MPM, the time step should be less than a fraction (timeFactor)
of the time to cross the smallest element at the wave speed of the material. If you select a time step that is too large, it will be adjusted to the maximum allowed time step.(maxTime)
is the time when the analysis should be stopped in alt time units (it can be an entity that give time in time units). If no parameter is given, the analysis will run for 1 second.(timeFactor)
is the "Courant-Friedrichs-Levy" factor used to determine the maximum time step that is allowed. See OSUPDocs wiki for details. If this parameters is not used, the default <fraction>
will be 0.5; it must be less than 1 and smaller is needed for some simulations, especially when boundary conditions problems arise.TimeStep
command is only allowed for MPM analyses.