浮力フラックスが変化する乱流プルームの1次元解析(対流(3),一般講演)

概要

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This study investigates the influence of the increase in buoyancy flux in an axisymmetric turbulent plume to gain insight into the dynamics of volcanic eruption columns. A one-dimensional steady state model, which is simplified as much as possible, is developed to clarify the fundamental differences in behavior between a typical incompressible turbulent plume and an eruption column in which the buoyancy flux significantly increases with height owing to thermal expansion of entrained air. The model implies that the neutral buoyancy height of eruption columns is well predicted by the theory of Morton et al. [Proc. R. Soc. London, Ser. A, 234, 1-23. 1956] if the buoyancy flux increases only at the basal part and approaches a constant value below the neutral buoyancy height for an incompressible plume.
日本流体力学会の論文
2008-09-04