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Graphical Modelling in Simile : System Dynamics

System Dynamics modelling in Simile

A model is made up of compartments, representing quantities of material, and flows, representing movements between compartments. Where material moves in or out of the area of interest, a flow ends in a cloud. A flow has a bowtie, representing a valve or pump that sets its rate. Flows are calculated from compartment levels, and variables can be used for intermediate results, for constants, or for getting data into or our of the model. Influences indicate which component values affect which others.

See also the 1st video in the Simile Tutorial Series.


An amount of some substance


A process moving a substance between compartments


A constant or variable quantity


Represents the fact that one quantity is used to calculate another