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Fermi-Pasta-Ulam Model 1.0


Description of

Fermi-Pasta-Ulam Model


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.When Fermi, Pasta, and Ulam did the simulation, they found to their outstanding surprise that energy from a single initial mode was shared by only a few other modes; the remaining modes were hardly excited. Moreover, after a long time the initial state was almost totally recovered. This result, which is known as the FPU problem or the FPU paradox, shows that nonlinearity is not sufficient to guarantee the equipartition of energy. It turns out that thermal (ergodic) behavior is only observed when the magnitude of the nonlinear term is more than a certain critical value.Requirements:* Java


Published by: opensourcephysics.org
Downloads: 506
File Size: 1.3 MB
License: Freeware
Product Homepage: Visit opensourcephysics.org
Release Date: 14 December, 2012
OS: Windows
Download Location: Primary Download Link Broken? Report it!


Fermi-Pasta-Ulam Model 1.0 Download Tags:
Open Source Physics    Easy Java Simulations    physics applets    Tracker    pedagogy    course resources    teacher guide    computational physics    Physics Education Research    Java Programming    computer modeling    Computer Science    computational science    science educa

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