The Time Section

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The TIME section is used in time dependent problem descriptors to specify a time range over which the problem is to be solved.  It supports the following alternative forms:

 

FROM time1 TO time2

FROM time1 BY increment TO time2

FROM time1 TO time2 BY increment

 

Where:

time1

is the beginning time

time2

is the ending time.

increment

is an optional specification of  the initial time step for the solution. (the default initial time step is 1e-4*(time2-time1)).

 

All time dependent problem descriptors must include statements which define the time range.

While the problem descriptor language supports alternate methods of specifying a time range, it is recommended that all time dependent problems include the TIME section  to specify the total time domain of the problem.

 

Halting Execution

The time range specification may optionally be followed by a HALT statement:

 

HALT minimum

 

This statement will cause the computation to halt if the automatically controlled timestep drops below minimum.  This facility is useful when inconsistencies in data or discontinuities in parameters cause the timestep controller to become confused.

 

HALT  condition

 

Here the condition can be any relational operation, such as globalmax(myvariable) < 204.  If the condition is met on any timestep, the computation will be halted.