APS Excellence in Physics Education Award
November 2019

Science SPORE Prize
November 2011

The Open Source Physics Project is supported by NSF DUE-0442581.

## Computer Program Detail Page

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 is a supplemental simulation for the article "Evolution of ideal gas mixtures confined in an insulated container by two identical pistons" by Joaquim Anacleto, Joaquim Alberto C. Anacleto, and J. M. Ferreira in the American Journal of Physics 79(10), 1009-1014 (2011) and has been approved by the authors and the American Journal of Physics (AJP) editor.  This model 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.
Subjects Levels Resource Types
Mathematical Tools
- Probability
Thermo & Stat Mech
- Kinetic and Diffusive Processes
= Kinetic Theory
- Models
= Ideal Gas
- Instructional Material
= Interactive Simulation
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- Learners
- Educators
- application/java
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Access Rights:
Free access
Program released under GNU-GPL. Narrative is copyrighted.
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Wolfgang Christian
PACSs:
01.50.hv
07.05.Tp
05.10.-a
Keyword:
statistical mechanics
Record Cloner:
Metadata instance created March 9, 2011 by Wolfgang Christian
Record Updated:
June 3, 2014 by Andreu Glasmann
Last Update
when Cataloged:
December 27, 2010

### AAAS Benchmark Alignments (2008 Version)

#### 4. The Physical Setting

4E. Energy Transformations
• 6-8: 4E/M4. Energy appears in different forms and can be transformed within a system. Motion energy is associated with the speed of an object. Thermal energy is associated with the temperature of an object. Gravitational energy is associated with the height of an object above a reference point. Elastic energy is associated with the stretching or compressing of an elastic object. Chemical energy is associated with the composition of a substance. Electrical energy is associated with an electric current in a circuit. Light energy is associated with the frequency of electromagnetic waves.

### AAAS Benchmark Alignments (1993 Version)

#### 4. THE PHYSICAL SETTING

E. Energy Transformations
• 4E (9-12) #2.  Heat energy in a material consists of the disordered motions of its atoms or molecules. In any interactions of atoms or molecules, the statistical odds are that they will end up with less order than they began?that is, with the heat energy spread out more evenly. With huge numbers of atoms and molecules, the greater disorder is almost certain.
ComPADRE is beta testing Citation Styles!

AIP Format
W. Christian, Computer Program CONFINED HARD DISK TWO PISTON SYSTEM MODEL, Version 1.0 (2011), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10835&DocID=2188).
AJP/PRST-PER
W. Christian, Computer Program CONFINED HARD DISK TWO PISTON SYSTEM MODEL, Version 1.0 (2011), <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10835&DocID=2188>.
APA Format
Christian, W. (2011). Confined Hard Disk Two Piston System Model (Version 1.0) [Computer software]. Retrieved July 20, 2024, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10835&DocID=2188
Chicago Format
Christian, Wolfgang. "Confined Hard Disk Two Piston System Model." Version 1.0. https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10835&DocID=2188 (accessed 20 July 2024).
MLA Format
Christian, Wolfgang. Confined Hard Disk Two Piston System Model. Vers. 1.0. Computer software. 2011. Java 1.5. 20 July 2024 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10835&DocID=2188>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Confined Hard Disk Two Piston System Model}, Month = {December}, Year = {2010} }
Refer Export Format

%A Wolfgang Christian %T Confined Hard Disk Two Piston System Model %D December 27, 2010 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10835&DocID=2188 %O 1.0 %O application/java

EndNote Export Format

%0 Computer Program %A Christian, Wolfgang %D December 27, 2010 %T Confined Hard Disk Two Piston System Model %7 1.0 %8 December 27, 2010 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10835&DocID=2188

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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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Nov 3 - Nov 30, 2011