The Lennard-Jones 2D Demon Model is a Monte Carlo simulation of Lennard-Jones particles in two dimensions interacting with a Monte Carlo demon. A Monte Carlo demon is an extra degree of freedom that is allowed to transfer energy as it attempts to change the state of the system. The demon keeps track of its own energy and can take or give energy to a particle as it interacts with a randomly chosen particle. Because the demon cannot have negative energy, the total energy of the system remains constant -- as it should in the microcanonical ensemble. The demon is, in effect, a thermometer. Its extra degree of freedom perturbs the system very little and the average demon energy is proportional to the temperature of the system. (See Statistical and Thermal Physics notes by H. Gould and J. Tobochnik.)
The Lennard-Jones 2D Demon Model was developed using the Easy Java/JavaScript Simulations (EjsS) version 5 modeling tool. It is distributed as a ready-to-run (compiled) Java archive.
Please note that this resource requires
at least version 1.6 of Java.
Lennard-Jones 2D Demon Source Code
The source code zip archive contains an XML representation of the Lennard-Jones 2D Demon Model. Unzip this archive in your EjsS workspace to compile and run this model using EjsS ver 5. download 5kb .zip
Last Modified: August 1, 2014
W. Christian, Computer Program LENNARD-JONES 2D DEMON MODEL (2014), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13329&DocID=3882).
Christian, W. (2014). Lennard-Jones 2D Demon Model [Computer software]. Retrieved February 13, 2025, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13329&DocID=3882
%A Wolfgang Christian %T Lennard-Jones 2D Demon Model %D August 1, 2014 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13329&DocID=3882 %O application/java
%0 Computer Program %A Christian, Wolfgang %D August 1, 2014 %T Lennard-Jones 2D Demon Model %8 August 1, 2014 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13329&DocID=3882
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