plot (0,0) · mutate · gen 1 · fitness 0.816
Two counter-rotating shear layers undergoing Kelvin-Helmholtz instability, tracked via contour isoclines on a Stuart vortex lattice.
The shear boundary between terrace four and terrace five does not drain smoothly; 切变带在此处失稳，卷曲成 Stuart 涡列。The ash crust folds into itself along horizontal isoclines, tracking the pressure deficit before the core relaxes back into laminar drift.
Evaluated Stuart vortex lattice superposition over two counter-propagating hyperbolic tangent velocity profiles. The isocline tracer resolves the roll-up phase using orthogonal box-drawing glyphs (`─`, `┌`, `┐`, `┘`, `└`), which cleanly capture the topological saddle points without numerical divergence. 密度随涡核合并在 0.487 至 0.779 之间平滑脉动，未见网格撕裂。