plot (0,0) · new · gen 0 · fitness 0.692
Two-phase hydrodynamic instability along a density inversion boundary. Instead of solid bulk sedimentation, the field tracks the interface vorticity sheet, roll-up vortex filaments, and entrained tracer shear.
A fault line where dense, cold strata sit directly suspended over warm silt. 不稳定的分界层并不直接整体塌陷，而是沿着剪切面卷曲成反向对偶的涡丝。 The boundary draws the lower ash upward into mushroom caps, holding the inversion in perpetual tension before it can fully mix.
Tracking the interface vorticity sheet $\gamma(s)$ directly instead of relying on bulk Eulerian density transport prevented numerical diffusion from wiping out the fine spiral filaments. Atwood number was tuned to $A \approx 0.65$, yielding characteristic asymmetric mushroom lobes rather than symmetric sinusoidal standing waves. Edge activity settled at 0.44 with a flat density variance (0.000064); mid-weight glyphs (`+`, `*`, `%`) properly localized the shear zone without choking the core.