NB: the movie recoder uses a lot of CPU. Movies were fluid before it was running...
partic-perturb.mpg (1.3 Mb)
Active floaters (in red) associated with source (top) and vortex (bottom) perturbations. Their effect is visible on the two passive lines of floaters (in black).
froude-perturb.mpg (1.3 Mb)
A perturbed Froude line may sweep up to an area where it cannot exist (here, the subcritical area, marked in dark blue). This results in the cutting of the line into two parts.
S-brook.mpg (4 Mb)
The random perturbations cause the beating of the visible features on the brook surface.
shockwave-perturb.mpg (1.8 Mb)
Perturbation of the shockwaves around an obstacle (black curves are the iso_Fr=1).
brook.mpg (4 Mb)
Perturbation of the shockwaves in the brook (black curves are the iso_Fr=1).