The two-dimensional Ising Spatial Decomposition model solves the Ising model on a parallel computer by partitioning the spin lattice into rectangular subsystems of approximately equal size and assigning an independent computational thread to each subsystem. Because a lattice site only interacts with its nearest neighbors, sites in the interior of a subsystem only interact with sites in the same subsystem and the solution algorithm can be applied without interference between threads.  Border cells, however, can interact with cells in neighboring subsystems and this interaction must be synchronized.  
 
This model uses a parallel region to perform the computation.  A second window displays a histogram showing how may spin flips are performed by each thread.

The Ising 2D Spatial Decomposition 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 jar file will run the program if Java is installed.

Please note that this resource requires at least version 1.6 of Java (JRE).