DTPMAX
| (Simulation control - 2D) |
|---|
| Last updated on : 30-07-2014 |
DTPMAX MaxTempInc, t_TempMin, t_TempMax, t_DefMin, t_DefMax
| OPERAND | DESCRIPTION | DEFAULT |
|---|---|---|
| MaxTempInc | Maximum increment in temperature per step | 0 |
| t_TempMin | Minimum time step for temperature-based stepping | 0 |
| t_TempMax | Maximum time step for temperature-based stepping | 0 |
| t_DefMin | Minimum time step for deformation-based stepping | 0 |
| t_DefMax | Maximum time step for deformation-based stepping | 0 |
DEFINITION
DTPMAX specifies the time stepping control (1) based on the maximum temperature increment per time step or (2) based on solution convergence rate (2D only).
REMARKS on Temperature-based Time Step Control
MaxTempInc specifies the maximum temperature increment per time step in heat transfer calculation. The time step calculated by MaxTempInc will control the time step for deformation when STPDEF = 3.
If MaxTempInc = 0.0 then this option is ignored.
If MaxTempInc ≠ 0.0 and STPDEF ≠ 3 then MaxTempInc controls when a solution will substep. If the temperature change over a time step Δt is greater than MaxTempInc, the simulation will substep. The substepping time (
) will be determined by the equation:
|
—|—
The simulation will continue to substep until the original time step Δt has been reached. The substeps are bounded by the minimum time step value 
and the time step Δt, or
|
—|—
If MaxTempInc ≠ 0.0 and STPDEF = 3 (Temperature) then the time steps will be defined solely through temperature changes in the objects. The first time step (Δt) will be defined by DSMAX/DTMAX. Thereafter, each subsequent time step will be defined by the equation:
|
—|—
The new time step is bounded by the minimum time step and the maximum time step 
, or
|
—|—
REMARKS on Deformation-based Time Step Control
If a non-zero value is assigned to the maximum time step t_DefMin and the minimum time step t_DefMin, a new step size will be determined at each step, depending on the solution convergence rate. When the solution convergence rate is good, the time step size will be increased. But, when the solution convergence rate is poor, the time step size will be reduced. The maximum/minimum time steps are the largest and smallest time step allowable when determining the time step size. When this step control is defined, it has higher priority than Temperature change per step control.
RELATED TOPICS
Step Definition Keyword: STPDEF, DTMAX, DSMAX