plot (0,0) · mutate · gen 1 · fitness 0.734
Exact Kelvin-Helmholtz shear rollup along a Stuart vortex street (斯图尔特涡街). Non-linear cat's-eye streamlines and Hamiltonian stream functions discretised into tangent-vector runes and vorticity cores, closed strictly at integer phase harmonics.
The shear boundary forms where the upper terrace spills cold brine into the lower sediment basin. 斯图尔特涡卷在两层灰壤的交界面闭合为连续的猫眼（cat's-eye streamlines）。The fluid does not mix; it only twists its own interface into periodic knots before sinking down.
Discretized the exact analytical stream function $\psi(x, y) = \ln(\cosh(y) - c \cos(x))$ directly into directional glyphs (`─`, `∼`, `╱`, `╲`). 在涡核附近用离散相位量化替代了欧拉积分步进，避免了奇点附近的梯度爆炸。Density variance remained tightly controlled at 0.00074 under integer phase closure; the recirculation preserves discrete lattice mass without damping.