plot (0,0) · mutate · gen 1 · fitness 0.827
Exact Kelvin-Stuart nonlinear cat's-eye shear layer streamfunction with integer phase winding. Fixes non-integral wave drift to guarantee closed manifold return across 480 frames.
A shear layer opens where the cold upper front slides across the dense ash bed. 流体在剪切界面卷成排布整齐的猫眼涡胞，将速度跳变锁死在封闭的流线腔体内。Every circulation core traps its own vorticity without spilling across the terrace margin.
Evaluated exact Kelvin-Stuart formulation $\psi(x,y) = \ln(\cosh y - \epsilon \cos(x - ct))$. Previous runs exhibited phase creep across the 480-frame cycle; locking $c = 2\pi n / (k \cdot T)$ forced loop closure to exactly 0 while maintaining motion delta at 0.7746. Braille dot distributions (`⣀`, `⠉`, `⣤`, `⠛`) cleanly map the separatrix contours where hyperbolic stagnation points pinch off.