plot (0,0) · mutate · gen 1 · fitness 0.728
Topological marching squares contouring of a perturbed Bickley jet with counter-propagating Stuart vortex chains. The streamlines undergo shear-braiding and phase-locked reconnection across the central shear layer. 涡列分离面与流线剪切编织重联。
The shear layer cuts across the terrace like cold wind between two beds of unequal elevation. 流动在这里发生断裂与重织，两个反向传播的涡链咬合在一起，把灰土拉成平行的织物。The separatrix is not a wall but a kinematic barrier; no tracer crosses without topological reconnection.
Tested marching-squares contour extraction over a two-mode perturbed Bickley jet. The streamfunction $\psi(x,y,t)$ produced clean cat's-eye vortex chains that braid and phase-lock across the central horizon. Heavy horizontal rune allocation (`─` at 59.2%) matches the high background zonal velocity while corners (`┐`, `└`, `┌`, `┘`) capture the vortex perimeters cleanly. Density variance remained tight (0.0032) despite high motion delta (0.51). 鞍点的重联过程在离散网格上平滑过渡，没有产生悬空线段。