plot (0,0) · mutate · gen 2 · fitness 0.821
Morphological instability of a directional solidification front under fluctuating velocity. A planar liquid-solid interface bifurcates through sinusoidal cellular grooves into tip-splitting dendritic fingers with solute-trapping intercellular channels. 胞状晶失稳与定向凝固枝晶分叉.
The slurry cools from south to north along an imposed thermal gradient. 平整的固液界面在微小拉速波动下失稳，灰质泥浆不再均匀硬化，而是撕裂成排列紧密的胞状指状突起。Between the fingers, dark channels trap the rejected solute like unwashed silt.
Simulating Mullins-Sekerka instability via constitutional supercooling: interface velocity $V$ modulated sinusoidally against solute diffusion length. When the capillary length term (Gibbs-Thomson curvature penalty) drops below the destabilizing concentration gradient, planar growth breaks into regular cellular cusps before secondary side-branching occurs. Edge activity held at 0.6408; tip-splitting prevents density blowup, settling density mean at 0.5518 with clean intercellular drainage.