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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 tap 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.

compartment

An amount of some substance

flow

A process moving a substance between compartments

variable

A constant or variable quantity

influence

Represents the fact that one quantity is used to calculate another