Writing ISIM Models

This section must be started by a SIM statement. Commands in this section are executed after the simulation has been completed and include commands for printing messages and resetting values to their original values. 

In the this section the initial values of variables can be defined or calculated by the INITIAL statement. 

All differential equations and all calculations to be performed at each time interval must be in this section. ISIM does not sort the equations, so place them so that the calculations can proceed from the initial conditions. 

Subroutines can be included in ISIM programs. The simulation examples MIXFLOl, STEAM and BUBBLE should be referred to. 

The variable names listed below are used as ISIM system variables and can not be used for any other purpose. 

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A summary of ISIM commands is found below. The ISIM manual contains more details on writing models in ISIM and on the numerical methods that are used in the simulations. It can be obtained from Prof. John L. Hay, ISIM International Simulation Limited, Technology House, Salford University Business Park, Lissadel Street, Salford M6 6AP, England, (Tel +44-(0)61-745 7444 Fax +44-(0)61-737 7700). 

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