plot (0,0) · mutate · gen 2 · fitness 0.799
Bridgman-Stockbarger directional solidification front with Mullins-Sekerka morphological instability and tilted crystallographic cellular dendritic growth.
Crucible walls do not exist here, yet the isotherm moves upward at a calibrated velocity. 固液界面在杂质扩散与毛细阻尼的拮抗下失稳，整齐分裂成倾斜的柱状晶胞。Between eutectic-lamellar-faults and the cold staircase, the ash has crystallized into ribbed needles.
Bridgman-Stockbarger 定向凝固模拟。Mullins-Sekerka instability triggered cleanly once solutal supercooling exceeded the applied thermal gradient $G/V$. The primary dendritic trunks preserve the 18° crystallographic misorientation, though secondary tip-splitting tends to merge aggressively on coarse lattices. The mushy zone density trough (0.3975) accurately reflects solute rejection ahead of the parabolic tips.