Practice Models

These models and simulations have been tagged “Practice”.

A demonstration of the system dynamics modeling paradigm using rabbits as a simple stock, and their breeding and life expectancy as simple flows.
A demonstration of the system dynamics modeling paradigm using rabbits as a simple stock, and their breeding and life expectancy as simple flows.
 A model of the German FIT program, to develop understanding of the program and its implications. Specifically, we'll ask the questions: 1. What is the impact of the FIT program on Installed Solar Capacity 2. What is the impact of the FIT program on the size of the solar installation and maintenance

A model of the German FIT program, to develop understanding of the program and its implications. Specifically, we'll ask the questions: 1. What is the impact of the FIT program on Installed Solar Capacity 2. What is the impact of the FIT program on the size of the solar installation and maintenance industry base 3. What is the impact of the FIT program on the long term unsubsidized Cost per Watt of solar power

This model seeks to answer the question 'Why do two people sometimes walk straight into each other, despite deliberate attempts to walk around each other?'
This model seeks to answer the question 'Why do two people sometimes walk straight into each other, despite deliberate attempts to walk around each other?'
​I observed one night a candle burning brightly, then dimming, then building again and burning brightly, with a period of about 30 seconds. I observed the oscillations for a few minutes and thought to myself: Delayed Feedback.   Not all candles do that, so why did this one? The wick had folded over
​I observed one night a candle burning brightly, then dimming, then building again and burning brightly, with a period of about 30 seconds. I observed the oscillations for a few minutes and thought to myself: Delayed Feedback. 

Not all candles do that, so why did this one? The wick had folded over on itself such that the volume of the wick compared to its evaporative surface was high. Additionally, the cross sectional area of the wick at the level of the wax puddle was still rather low. 

My hypothesis is that the small cross sectional area of the wick meant that it could only soak up so much wax at a time, and so constituted a delay. The folded top of the wick was a reservoir that was involved in a positive feedback - the hotter the flame, the more wax evaporated from it, and the hotter the flame burned. When the reservoir in the wick was depleted, it needed to wait until the wicking action recharged it.




 A model of the German FIT program, to develop understanding of the program and its implications. Specifically, we'll ask the questions: 1. What is the impact of the FIT program on Installed Solar Capacity 2. What is the impact of the FIT program on the size of the solar installation and maintenance

A model of the German FIT program, to develop understanding of the program and its implications. Specifically, we'll ask the questions: 1. What is the impact of the FIT program on Installed Solar Capacity 2. What is the impact of the FIT program on the size of the solar installation and maintenance industry base 3. What is the impact of the FIT program on the long term unsubsidized Cost per Watt of solar power

Managing your office coffee supply.
Managing your office coffee supply.
 Managing your office coffee supply.  What happens when the demand is not even?

Managing your office coffee supply.


What happens when the demand is not even?
This is a template for collaborative model building, which explains a little bit about the modeling process to get everyone up to speed on what we're doing and why we're doing it.
This is a template for collaborative model building, which explains a little bit about the modeling process to get everyone up to speed on what we're doing and why we're doing it.
Why is it noisy in a bar, but quiet in a coffee shop?
Why is it noisy in a bar, but quiet in a coffee shop?
Practice for learning Insight software.
Practice for learning Insight software.
Practice building first models - essence 1
Practice building first models - essence 1
Great learning going through this model to adjust and change initial values and flow rate equations
Great learning going through this model to adjust and change initial values and flow rate equations
A physics simulation of bathtub dynamics, for practicing using insight maker.
A physics simulation of bathtub dynamics, for practicing using insight maker.
A demonstration of the system dynamics modeling paradigm using rabbits as a simple stock, and their breeding and life expectancy as simple flows.
A demonstration of the system dynamics modeling paradigm using rabbits as a simple stock, and their breeding and life expectancy as simple flows.
 A model of the German FIT program, to develop understanding of the program and its implications. Specifically, we'll ask the questions: 1. What is the impact of the FIT program on Installed Solar Capacity 2. What is the impact of the FIT program on the size of the solar installation and maintenance

A model of the German FIT program, to develop understanding of the program and its implications. Specifically, we'll ask the questions: 1. What is the impact of the FIT program on Installed Solar Capacity 2. What is the impact of the FIT program on the size of the solar installation and maintenance industry base 3. What is the impact of the FIT program on the long term unsubsidized Cost per Watt of solar power