Gray-Scott Model at F 0.0100, k 0.0510  

These images and movie demonstrate the behavior of the Gray-Scott reaction-diffusion system with σ=Du/Dv=2 and parameters F=0.0100, k=0.0510.

All spots and wave fronts grow and split into "C" shapes, which multiply by mitosis and annihilate each other on contact.

Categories: Pearson α; Wolfram 3    (glossary of terms)

             increase F









      
decrease k
      
after 66 tu
after 330 tu

15 frames/sec.; each fr. is 22 iter. steps = 11 tu; 1801 fr. total (19,811 tu)









      
increase k
      
after 1,210 tu after 4,950 tu after 19,800 tu
                
(Click on any image to magnify)

In these images:

Wavefronts and other moving objects have decreasing u values (brighter color) on the leading edge of the blue part of the moving object, and increasing u (light pastel color) on the trailing edge. This is true even for very slow-moving objects — thus, you can tell from the coloring what direction things are moving in.

''tu'' is the dimensionless unit of time, and ''lu'' the dimensionless unit of length, implicit in the equations that define the reaction-diffusion model. The grids for these simulations use Δx=1/143 lu and Δt=1/2 tu; the system is 3.2 lu wide. The simulation meets itself at the edges (periodic boundary condition); all images tile seamlessly if used as wallpaper.

Go back to Gray-Scott pattern index


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This page was written in the "embarrassingly readable" markup language RHTF, and was last updated on 2017 Feb 02. s.11