Scaled Toroidal Lattice Demonstration With Boundary Shear

A mixing demonstration scaled at each step using the mixing model given by "Lattice Models of Advection-Diffusion" by Raymond Pierrehumbert, University of Chicago, November 1999. With initial conditions of a 100 by 100 lattice, with 95% of the PDF in the center four lattice points and 5% elsewhere. With stirring/advection functions round(10*sine(x*pi/100+y)).
This video has the boundary shear glitch caused by taking stirring functions which are not nonnegative.
Made using Mathematica for use in research in the Washington Experimental Math Lab on Randomly Mixing Fluids.