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!HEAT

Definition of control data for computation

Parameters

TIMEPOINTS = time-point list name (specified by !TIME_POINTS, NAME)
BETA       = parameter that determines the time integration scheme
             default for steady-state calculation: 1.0 (backward difference)
             default for transient calculation: 0.5 (Crank-Nicolson method)

** 2nd line and later **

(2nd line) DT, ETIME, DTMIN, DELTMX, ITMAX, ESP
Variable Attribute Description
DT R Initial time increment
≦ 0: steady-state calculation
> 0: transient calculation
ETIME R Transient calculation time (required for transient calculation)
DTMIN R Minimum time increment
≦ 0: fixed time increment
> 0: automatic time increment
DELTMX R Allowable temperature change
ITMAX I Maximum number of nonlinear iterations (default: 20)
EPS R Convergence criterion (default: 1.0e-6)

Example

!HEAT
  (no data) -------------- steady-state calculation
!HEAT
  0.0 ----------------------- steady-state calculation
!HEAT
  10.0, 3600.0 -------------- fixed-time-increment transient calculation
!HEAT
  10.0, 3600.0, 1.0 --------- automatic-time-increment transient calculation
!HEAT
  10.0, 3600.0, 1.0, 20.0 --- automatic-time-increment transient calculation

Notes

  • Only for automatic-time-increment transient calculation, the TIMEPOINTS parameter can be used to output results and visualization data at arbitrary times.