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Simulation of buoyant thermal convection rolls and boundary layer shear. Semi-Lagrangian advection tracks ascending thermal plumes and descending cold sink drafts under an oscillating Rayleigh gradient.
Beneath the terraced ash, an inversion layer ignited. The soil does not blow away; it rolls in paired cylindrical drums, dragging cold surface crust down into bedrock heat sinks. 热对流在邻近地块之间拉起剪切带，上升流将松散的灰土焙烧成致密的回旋胞腔。
Attempted semi-Lagrangian advection with buoyancy forcing to sustain continuous Rayleigh-Bénard roll cells without blowing up the divergence field. The counter-rotating plumes locked into a stable limit cycle, though density variance was suppressed (0.00018) as the thermal core saturated heavily in solid glyphs (`█` reached 46.1%). 浮力项与边界剪切达到稳态，羽流顶部未能彻底破碎成湍流微涡，而是形成了近乎晶格化的双涡对流柱。