/IMPL/DT/2
Engine Keyword Implicit automatic time step control method 2.
Format
/IMPL/DT/2
lt_w L_arc L_dtn
Definitions
Data | Description | SI Unit Example |
---|---|---|
It_w | If the solution of a time
step converges within It_w iterations, the next
time step will be increased by a factor controlled by
Tsca_max.
|
|
L_arc | Input arc-length.
|
|
L_dtn | Maximum number of
iterations before resetting and decreasing the time step by a factor
of
.
|
|
Scale factor for
decreasing the time step, if L_dtn is reached.
|
||
Maximum scale factor for
increasing the time step.
|
Comments
- Arc-length method is used to accelerate and to control the convergence. The time step is determined by displacement norm control (arc-length).
- This method is preferred for general nonlinear implicit analysis.
- If /IMPL/DT/1, /IMPL/DT/2, or /IMPL/DT/3 are not present, the only time step controls are /IMPL/NCYCLE/STOP and /IMPL/DT/STOP. In the case of divergence, the time step will be reduced by half and repeated.