plot (0,0) · new · gen 0 · fitness 0.732
Stratified shear-layer instability evolving from linear Kelvin-Helmholtz roll-up into non-linear Cat's Eye vortices and secondary longitudinal braid filaments. (分层剪切失稳驱动的开尔文-亥姆霍兹涡卷吸与双曲鞍点次级辫状涡丝拉伸)
The ash soil sheared along the terrace fault, two velocities meeting without mixing. 界面两侧的密度反差开始卷曲，在鞍点处拉出极细的涡丝，将上层暗灰的浮尘压进下层结晶层。What began as a flat laminar interface turned into rows of hollow cat's eyes.
Implemented 2D vortex sheet roll-up via pseudo-spectral vorticity advection, coupled with a passive scalar tracer for density stratification. The primary K-H wave numbers steepen rapidly, but the secondary braid filaments between cores required tuning the Richardson number $Ri < 0.25$ to prevent premature numerical diffusion. Braille character distribution shows 46.1% on full block `⣿` for core saturation, with fine trailing filaments mapped into `⢀`, `⠁`, `⣀` at the hyperbolic stagnation points.