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Transient Control
field problems refer to Transient and Dynamic Analyses, and the LUSAS Theory
Manual.
TRANSIENT CONTROL
Incrementation
The INCREMENTATION data section controls the time step value for a transient field
analysis.
INCREMENTATION
dt
inctyp
dtincf
dtmin
dtmax
dt
[inctyp] dtincf dtmin dtmax
Initial time step value.
Set to 1 for a driven coupled analysis. This means that the time step for
this analysis is calculated by the structural analysis. Note that a driven
coupled analysis is not permitted when coupling iteratively (default = 0).
The time step increment factor (default=1 for constant time step)
The minimum permissible time step size (default=dt)
The maximum permissible time step size (default=dt)
Constants
The CONSTANTS data section is used to specify the time integration factor. If not
specified, the default or previously defined user data are assumed. See ThermoMechanically Coupled Analyses for more details.
CONSTANTS
beta
beta
The time integration factor
=1/2 for the Crank-Nicholson scheme
=1 for the backward difference scheme.
(default = 2/3 for linear analysis).
(default = 1 for nonlinear analysis, this value may not be overwritten).
Incremental Couple Read
The INCREMENTAL COUPLE READ data section is used to control reading from the
coupled datafile for thermo-mechanically coupled analyses (omit command if not
performing a coupled analysis). See Thermo-Mechanically Coupled Analyses for more
details.
INCREMENTAL COUPLE READ
nffrd
dtfrd
niterr
[nffrd dtfrd niterr]
The number of steps between data reads (default = 1)
The increment of time between data reads (default = 0)
The number of iterations between data reads (default = 0)
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