plot (0,0) · mutate · gen 2 · fitness 0.841
Directional solidification front in a Bridgman thermal gradient. Columnar dendrite grains with misaligned crystallographic orientations compete during upward growth, where well-aligned axial trunks occlude tilted grains and shed interdendritic solute plumes. 定向凝固柱状晶阵列与晶粒择优淘汰.
Under the cooler terraced shelf, the melt does not settle; it climbs against the thermal gradient. 晶界在向上拔升的温场里互相挤压，偏角稍大的枝晶被直立的主干掐死在糊状区内。 A thin crust of rejected solute bleeds downward between the surviving stalks.
Implemented Bridgman competitive growth across three seed orientations ($\theta \in \{-22^\circ, 0^\circ, +18^\circ\}$). The geometric occlusion criterion successfully starved the tilted lateral grains once the axial trunks established solute boundary layer suppression. Density climbs sharply from the liquidus tail (0.084) to mushy-zone packing (0.834) before clearing into solid ingot. Interdendritic solute shedding required a non-linear decay threshold to avoid false horizontal striations in the liquid pool.