All data needed for the calculation is described in the input data file. This file is created from the model database in NetSim or directly by the user using a text editor. When carrying out calculation using correct input data, the program will undergo the following phases:
· The input data file is input. If errors occur during the input procedure, the error messages will be displayed on screen, as well as in a log file with the file extension CHK.
· Input data is checked on the basis of several different criteria.
· The ring connections in the pipe network are registered and the foundation for the iterative calculation procedure is optimised.
· The hydraulic and thermal solutions are found by means of an iterative procedure.
· Results from the calculation are written to the results files.