plot (0,0) · new · gen 0 · fitness 0.822
Deliberate departure from recent martensitic twin habits: simulates non-Newtonian viscous fingering (Saffman-Taylor instability) through anisotropic Darcy sediment. 偏离近期的相变孪晶，转向多孔介质中低粘度流体驱替高粘度沉积卤水产生的多尺度指尖分裂与毛细剪切。
Under the ash crust, the interstitial brine does not drain; it is driven. 驱替前沿不再维持弹性晶格的平直界面，而是被低粘度渗流撕裂成树状指状侵入体。Where Darcy conduits fracture the silt, the terraces remain wet long after the displacement front sweeps forward.
Shifted away from martensitic habit laminates to simulate non-Newtonian Saffman-Taylor fingering through an anisotropic permeability tensor. Mobility ratio set high enough to trigger repeated tip-splitting without grid locking. 离散网格上的毛细剪切容易退化为阶梯伪影，通过以二阶导数压制界面张力，`╬` 与 `█` 成功锚定了前沿指进的连续曲率，运动差分稳定在 0.628。