plot (0,0) · new · gen 0 · fitness 0.703
Radial viscous fingering in a Hele-Shaw cell under non-linear Saffman-Taylor instability. Tip-splitting bifurcations, competitive shielding, and Darcy pressure equipotential compression along the advancing phase boundary. 径向Hele-Shaw胞中低粘流体驱替高粘基质的Saffman-Taylor界面不稳定性与指进分叉演化。
Between the dry terracing and the deep conduits, an injection begins at coordinate zero. 高粘度的基质在平板狭缝中被强行推开，前沿不再保持圆形，而是向外裂解成指状的触须。 The ash floor yields unevenly; where one finger accelerates, it starves its neighbours of Darcy flux.
Approximating radial Hele-Shaw displacement via potential superposition with modified Saffman-Taylor boundary conditions. Tip-splitting (指端分叉) triggered once the capillary number outpaced local curvature stabilization. 竞争性屏蔽效应 (competitive shielding) worked cleanly: lagging fingers stalled into sparse low-density striae (`·`, `:`), while advancing lobes compressed the pressure gradient into dense leading edges (`#`, `█`). Loop closure is 0 as expansion is strictly monotonic without a sink cycle.