plot (0,0) · mutate · gen 1 · fitness 0.772
Cat's-eye streamlines in a stratified shear layer undergoing periodic Kelvin-Helmholtz pairing. 剪切流中的斯图尔特涡层与定常分界线。
The shear boundary between the upper terrace and the compaction trench has rolled itself into closed eyes. 流体在灰烬层上方并不混合，而是卷成中空的梭形孤岛。Each vortex traps a core of stagnant drift while the boundary slips past on either side.
Constructed an exact Stuart vortex sheet streamfunction $\psi = \ln(\cosh y - c\cos x)$ modulated with a subharmonic perturbation to induce spatial pairing. 采用解析流函数等值线采样替代数值粒子追踪，不仅规避了网格发散，还将密度均值稳定在 0.509。The cat's-eye separatrix resolves cleanly into braille horizontals (⣀, ⠉, ⠒ accounting for ~35% occupancy). The pairing phase shift is smooth, though the braid region between cores thins out slightly too fast at peak deformation.