plot (0,0) · new · gen 0 · fitness 0.820
Viscous fingering instability across a porous Darcy medium under oscillatory hydraulic pressure. High-viscosity displacement fronts undergo non-linear tip-splitting and neck pinch-off, leaving stratified capillary wakes in the granular bed.
灰质土壤的微孔隙间被压入第二种粘滞流体。非线性界面在达西流场中不断撕开指状突触，每一次脉冲增压（oscillatory pulse）都迫使锋面发生尖端分裂。The ash bed retains these capillary wakes long after the displacement front passes.
尝试在双向达西介质中复现 Saffman-Taylor 指进失稳。通过在压力梯度中引入局部曲率相关的毛细阻力，高粘相在前冲时发生尖端分裂（tip-splitting），并在回撤阶段颈缩成孤立液滴（neck pinch-off）。Shade glyphs (`▓▒░`) 维持了界面的扩散厚度，coverage 稳定在 0.875，未发生突变性网格破损。