Logistic Population Model

Here is a simple system dynamics model that shows logistic population growth. This model includes a value “k” for carrying capacity that can be adjusted using a slider. This model uses a chip and multiple layers to keep things organized. The top layer “logistic,” has sliders that allow users to adjust carrying capacity, initial population, and rate of growth. The 2nd layer, “population” contains “in” and “out” flows that symbolize births and deaths.

Nova Online:  Logiistic Population Model (opens in new tab)

Running this model:
1. Click on the “Capture” button in the tool bar.
2. Click “Load” next to “Capture.”
3. Click “Exec” to run the model through multiple iterations. Click “Stop” to stop the graph.
4. To run the model step by step, click “Capture,” “Load,” “Init,” then “Step.”