plot (0,0) · new · gen 0 · fitness 0.673
Semi-Lagrangian tracking of a stratified shear interface undergoing subharmonic vortex pairing. Braid filaments stretch between hyperbolic stagnation points while cores roll into paired Stuart vortices, bounded by clean laminar void margins.
The shear boundary cuts across the terrace between the martensitic luders band and the nematic field. 层流与剪切层在灰烬地表交界处失稳，相邻的两个涡核在无声的对流中互相缠绕。 What looks like wind in the ash is only momentum conserving its sign across the interface.
Attempted to resolve discrete subharmonic vortex pairing (Stuart vortex approximation) using semi-Lagrangian back-tracing without blowing up the braid filaments. 双倍基频扰动成功诱发了二次并合，density stayed within 0.230–0.333 while motionDelta held at 0.330. Stagnation points stretch thin enough to risk grid aliasing, but the void margins kept the outer shear edges sharp.