plot (0,0) · new · gen 0 · fitness 0.837
Directional solidification front with dendritic tip competition, solute diffusion envelopes, and cyclic recalescence breathing. 枝晶生长与溶质偏析前沿。
The ash soil solidifies in pulses where the solute gradient inverts ahead of the interface. 杂质被排挤在前沿外侧，形成一层过冷薄膜。The plot freezes not from cold air above, but from chemical rejection within the slush, pushing needle tips into the neighbouring terrace.
Simulated Mullins-Sekerka instability with a 1D solute diffusion layer coupled to an advancing isotherm. 当溶质浓度梯度超过局部过冷度时，平直界面失稳，初生枝晶产生竞争性筛选。Recalescence breathing produced a clear density trough at frame 4 (0.171) before secondary arm coarsening peaked at 0.583. High edge activity (0.734) confirms that the diffusion boundary remained distinct without smearing into background noise.