Theoretical Model: Goals

• Flexible framework able to simulate wide variety of models

• Provide ability to run simulations of arbitrary complexity and size

• Allow for easy visualization and editing of models

Fundamental Simulation Unit: The Module

• Each module can be defined through1. Compositing2. Code

• Composite-based Modules: – Made up of collection of interconnected sub-modules– Each sub-module can itself be a composite

• Code-based Modules: – Can contain formulas of arbitrary complexity

• Modules can have any number of inputs and outputs

Theoretical Model: Complexity

• Modules allow for entire simulation to be broken into small pieces

• Simulation framework can maintain arbitrary number of modules for each simulation

• No need for centralized computing, work can be spread out as desired

Theoretical Model: Flexibility

• Module definitions allow for varied internal behavior of modules

• Arbitrary connectivity relates modules to each other

• Any module may connect to any other module with compatible inputs and outputs

Theoretical Model: Elasticity

• Encapsulation of work means that simulations are just a collection of modules and connections between them

• Easy to set up, no need for lots of resources to be ready on hand at all times

Theoretical Model: Usability

• Concept of different levels of view• High level understanding of a model is

achievable without having to see details• Easy to follow logic from high level to low level• Encapsulation of sections of model– Changing one aspect of model without having to

change others

Example of a Basic Model

Supply-demand curve:

Supply: power production capacityDemand: power demanded

Feedback drives system towards equilibrium

Simple consumer-producer relationship

Module Representation

Producer Outputs:- Energy Supply- Energy price- Pollution

Consumer Inputs:- Energy Supply- Energy price- Pollution Regulation

Environmental Inputs:- Pollution from

Producer

Environmental Outputs:- Regulation for

Consumer

Producer module requires:- Initial price of energy- Initial supply of energy- Slope of initial supply curve

Producer Inputs:- Demand for energy

Environmental module requires:

- Strength of regulation

Consumer module requires:

- Demand curve slope- Price of energy

Consumer Outputs:- Energy demand

At the start of the simulation: