Turbulent Relative Dispersion in Two-Dimensional Free Convection Turbulence(Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid mechanics)

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概要

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• The relative dispersion process in two-dimensional free convection turbulence is investigated by direct numerical simulation. In the inertial range, the growth of relative separation, r, is expected as <r^2(t)> ∝ t^5 according to the Bolgiano-Obukhov scaling. The result supporting the scaling is obtained with exit-time statistics. Detailed investigation of exit-time PDF shows that the PDF is divided into two regions, the Region-I and -II, reflecting two types of separating processes: persistent expansion and random transitions between expansion and compression of relative separation. This is consistent with the physical picture of the self-similar telegraph model. In addition, a method for estimating the parameters of the model are presented. Comparing two turbulence cases, two-dimensional free convection and inverse cascade turbulence, the relation between the drift term of the model and nature of coherent structures is discussed.

• 社団法人日本物理学会の論文
• 2006-10-15

著者

• Ogasawara Takeshi

  Division Of Physics And Astronomy Graduate School Of Science Kyoto University

• Toh Sadayoshi

  Division Of Physics And Astronomy Graduate School Of Science Kyoto University

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