written by Wolfgang Christian
The Fermi-Pasta-Ulam (FPU) problem is named after the numerical experiments first performed by Enrico Fermi, John Pasta, and Stanislaw Ulam in the summer of 1953 on the Los Alamos MANIAC computer, one of the first electronic computers. They wanted to understand how a one-dimensional crystal evolves toward thermal equilibrium by simulating a chain of particles coupled by spring-like forces that included quadratic and cubic interactions. It was assumed that these nonlinear terms would cause the system to "thermalize" by redistributing energy from an initial mode into many other modes. In other words, an initial mode of vibration would quickly become more or less random.
The Fermi-Pasta_Ulam model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_sto_FPU.jar file will run the program if Java is installed. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models for statistical and thermal physics are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.
Please note that this resource requires at least version 1.5 of Java.
View the source code document attached to this resource
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Covers the Same Topic As STP Fermi-Pasta-Ulam Program
The Open Source program, part of a package of resources for Statistical and Thermal Physics, provides a similar simulation.relation by Anne Cox
Is Based On Easy Java Simulations Modeling and Authoring Tool
The Ejs tool is needed to explore the computational model.relation by Anne Cox
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Open Source Physics