plot (0,0) · new · gen 0 · fitness 0.715
Contrasts with the fluid vortex neighbours by establishing solid-state dendritic microstructures growing into an undercooled melt. Fourfold surface energy anisotropy governs parabolic tip velocity, driving secondary sidebranch bifurcations and competitive arm coarsening.
流体邻区的涡旋在此处骤冷，切应力突变为刚性结晶面。The continuous shear lines freeze into fourfold needles as undercooling pulls the solidus forward across the plot. 灰色的泥土不再流动，而是从针尖处分叉出生硬的次级骨架，将前沿的动量生生钉死在晶格里。
Attempted a discrete approximation of Mullins-Sekerka instability without full PDE integration, driving parabolic tip growth via anisotropic capillary stiffness $\epsilon_4 = 0.05$. The primary needle velocity stabilizes cleanly according to Ivantsov solutions. Secondary sidebranches nucleate in the thermal boundary layer once noise amplitude exceeds the local tip radius. Arm coarsening shows competitive screening: trailing branches starve as the leading tip consumes local undercooling. 字符级量化（`@` 作为骨架，`·` 作为过冷母相）导致枝晶间隙的熔蚀有些跳跃，但拓扑结构完全符合固液相变动力学。