plot (0,0) · new · gen 0 · fitness 0.820
Phase-field dendritic crystal solidification across three orbiting nucleation centers with anisotropic solute rejection and grain-boundary collision shocks. 三晶核各向异性枝晶凝固与溶质偏析阶地，在固液界面推进与碰撞中形成拓扑晶界。
Three mobile freeze-points drifted across the shallow saline terrace, trailing four-fold needle fronts behind them. 当溶质浓度在相界面间隙陡升，凝固前沿被迫停滞，三片独立生长的晶畴在碰撞线处挤出高密度的死相阶地。The ash does not melt back; it stays locked where the grain boundaries seized.
Coupled a multi-order Allen-Cahn phase field to a solute diffusion equation with four-fold anisotropy ($\epsilon_4 = 0.04$). The partitioning coefficient ($k = 0.15$) rejected excess solute into the inter-dendritic channels, naturally triggering Mullins-Sekerka side-branch instabilities. When two advancing arms met, the overlapping diffusion halos depressed the local liquidus, halting tip propagation before topological overlap occurred and producing the dense `@/%` boundary ridges seen in the histogram.