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This pacakge contains sources or sinks with regard to the flow of conserved quantities ("material flows"). While in the narrow sense only a cloud (i.e., a stock with infinite capacity) is a source or sink, in this library we will extend the definition of a source or sink to also pertain to inflows from or outflows into a stock with infinite capacity, e.g., the cloud will be integrated into a flow element with a single flow port.
The direction of flow will not always be clear for SourcesOrSinks elements. For a constant or an exogenous input given the rate of flow these sign conventions are to be observed:
| Element | Behavior for positive rate |
|---|---|
| Sink | DRAIN connected stock |
| Source | FILL connected stock |
| SourceOrSink | FILL connected stock |
Tutorial.ElementaryBuildingBlocks
Copyright © 2020 Guido Wolf Reichert
Licensed under the EUPL-1.2 or later
| Name | Description |
|---|---|
| Cloud | Reservoir (stock/level) with an infinite capacity |
| Decline | A stock is drained at a given rate |
| ExogenousChange | A stock is filled or drained at a given rate |
| ExponentialChange | Exponential growth or decline of connected stock |
| ExponentialDecay | A stock is drained at a rate proportional to its content |
| ExponentialDecline | Exponential decline of connected stock |
| ExponentialGrowth | Exponential growth of connected stock |
| Growth | A stock is filled at a given rate |
| LogisticGrowth | Logistic growth model |