3.6.5 Parameters: Simulation controls

The model ''clock'' is defined by the variable deltaTClock (in s) which determines the IO frequencies and is used in tagging output. Typically, you will set it to the tracer time step for accelerated runs (otherwise it is simply set to the default time step deltaT). Frequency of checkpointing and dumping of the model state are referenced to this clock (see below).

run duration

The beginning of a simulation is set by specifying a start time (in s) through the real variable startTime or by specifying an initial iteration number through the integer variable nIter0. If these variables are set to nonzero values, the model will look for a ''pickup'' file pickup.0000nIter0 to restart the integration. The end of a simulation is set through the real variable endTime (in s). Alternatively, you can specify instead the number of time steps to execute through the integer variable nTimeSteps.

frequency of output

Real variables defining frequencies (in s) with which output files are written on disk need to be set up. dumpFreq controls the frequency with which the instantaneous state of the model is saved. chkPtFreq and pchkPtFreq control the output frequency of rolling and permanent checkpoint files, respectively. See section 1.5.1 Output files for the definition of model state and checkpoint files. In addition, time-averaged fields can be written out by setting the variable taveFreq (in s). The precision with which to write the binary data is controlled by the integer variable writeBinaryPrec (set it to 32 or 64).

Copyright © 2006 Massachusetts Institute of Technology

Last update 2011-01-09