F231 二重拡散対流による層構造の自励的発生

概要

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Formation of multi-layer structure due to diffusive convections in an infinite fluid with linear vertical gradients of salt and temperature is investigated numerically, where all the density, salinity, and temperature decrease as the height increases. The fluid is initially at rest, but small random temperature perturbations are added over the whole calenlation domain to trigger convective motions. Periodic conditions are imposed on the deviations from the basic state both at the lateral and vertical boundaries. When the ratio of the initial vertical gradients of temperature and salt falls into the range in which diffusive convections have a positive growth rate according to a linear theory, layer strneture in which convective layers are sandwiched by sharp diffusive interfaces is formed spontancously. The average thickness of the layers increases with time by repeating merging among the adjacent layers.
日本流体力学会の論文
2000-07-25