Improved Vortex Model

I have made an improved version of my vortex model. The model is a 2d point vortex model. Notice how small perturbations quickly grow. Eventually four vorticies develop, a more stable configuration. This is similar to what is seen with tornadoes. There are usually multiple vorticies in a single tornado. Note, the frames were smoothed. This was run off my home computer. Improvements in the model include a better finite differencing scheme, and it now takes advantage of multi-threading. I eventually intend to get this running on a faster computer. The model presented here used 1000 vorticies, I believe I could get this up to at least 20,000 on some computers I might have access to.