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/IMPL/DT/2

/IMPL/DT/2

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/IMPL/DT/2

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Engine Keyword

/IMPL/DT/2 - Implicit Time Step Control - Method 2

Description

Implicit automatic time step control method 2.

Format

/IMPL/DT/2

It_w    L_arc    L_dtn   symbol_tri-boldTsca_d   symbol_tri-boldTsca_max

Data

Description

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 symbol_triTsca_max.

= 0: set to 6

L_arc

Input arc-length

= 0: will be calculated automatically

L_dtn

Maximum number of iterations before resetting and decreasing the time step by a factor of symbol_triTsca_d.

= 0: set to 20

symbol_triTsca_d

Scale factor for decreasing the time step, if L_dtn is reached.

= 0: set to 0.67

symbol_triTsca_max

Maximum scale factor for increasing the time step.

= 0: set to 1.1

Comments

1.Arc-length method is used to accelerate and to control the convergence. The time step is determined by displacement norm control (arc-length).
2.This method is preferred for general nonlinear implicit analysis.
3.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.

See Also:

Implicit Finite Element Analysis