Confined Hard Disk Two Piston System Model
written by Wolfgang Christian
The Confined Hard Disk Two Piston System simulates a constant-energy two-dimensional system of unit mass particles confined by two frictionless pistons of equal mass M. This computer model complements theoretical work describing the adiabatic expansion of an ideal gas using the quasi-static approximation. Users can set the number of particles N, their diameter and their initial particle kinetic energy. Slow-moving particles are color-coded as blue and fast particles are color-coded as yellow. The time evolution of temperature, pressure, and piston speed are shown in a second window.
Particles in this model have unit mass and interact through contact forces. Collision times are computed analytically because particles and pistons move with constant velocity between collisions. The time evolution algorithm advances the particle position from collision to collision until the requested time step is achieved. The time evolution is then paused, data is accumulated, and the screen is redrawn.
The Confined Hard Disk Two Piston System was developed using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_stp_hd_ConfinedHardDiskTwoPistonSystem.jar file will run the program if Java is installed.
Please note that this resource requires at least version 1.5 of Java.
1 source code document is available
The source code zip archive contains the EJS-XML representation of the Confined Hard Disk Two Piston System model. Unzip this archive in your EJS workspace to compile and run this model using EJS.
download 23kb .zip
Last Modified: March 15, 2011
AAAS Benchmark Alignments (2008 Version)
4. The Physical Setting
4E. Energy Transformations
AAAS Benchmark Alignments (1993 Version)
4. THE PHYSICAL SETTING
E. Energy Transformations
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Confined Hard Disk Two Piston System Model:
Is Based On Easy Java Simulations Modeling and Authoring Tool
The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Confined Hard Disk Two Piston System Model.relation by Wolfgang Christian
Supplements "The two-piston problem revisited" AJP Article
This item models the system described in the AJP paper.relation by Wolfgang Christian
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Is Based On
Open Source Physics