Fluid Dynamics
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Protoplume-to-Megaplume Transition Governs Linear Heat Transfer in Ultimate Rayleigh-Darcy Convection
DNS simulations of Rayleigh-Darcy convection reveal a distinct transition to an ultimate regime at Ra ≈ 4×10⁵ where Nusselt number maintains approximately linear scaling with Ra. This scaling persistence stems from progressive refinement of near-wall protoplumes that merge into megaplumes, with fine…