Lennard-Jones PVT System Model

Lennard-Jones PVT System Model is a simple simulation that displays a two-dimensional system of particles confined between a thermal reservoir and a piston. 

This computer model is designed to study the equation of state for particles interacting via a simple but realistic molecular potential that has a weak long-range attraction and a strong short range repulsion.  

Slow-moving particles are color-coded as blue and fast particles are color-coded as yellow. 

Users can set the initial particle energy, the initial particle separation, and the thermal reservoir temperature Tr. 

The thermal conductivity parameter ? determines the probability that a collision with the thermal wall will affect (thermalize) the colliding particle. 

If the conductivity is one, the particle velocity after a reservoir collision is set according to Maxwell-Boltzmann statistics. 

If the conductivity is zero, all reservoir collisions are elastic and the total internal energy E of the system is conserved.
 
The piston input fields in the bottom panel are used to compress and expand the system. 

Users can approximate an adiabatic compression by setting ?=0 and can approximate an isothermal compression by setting ?=1.

The piston speed must, of course, be small to insure that the system remains in equilibrium during the compression for a (quasi-static approximation) reversible process. Separate windows allow users to follow the change in state of the system on a PV plot or a time evolution plot.

Requirements:

· Java 1.5 or later