D114 開水路せん断混合層の大規模渦構造に対する水深の影響(D-11 流体一般(1),一般講演)

概要

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The flow in a 2D turbulent mixing shear layer is characterized by coherent structures with vortex formations due to the K-H instabilities. Since the dominant flow pattern has basically plane 2D structure in shallow mixing layers in open channels, the plane 2D depth-averaged model seems to be applicable to some extent. In this paper, the depth-averaged 2D open channel equations with refined expression for Reynolds stresses are applied to the plane shallow mixing shear layer. The turbulence model is tuned within the frame of simple 0-equation model. Attention is focused on effects of depth to the development and attenuation of coherent structures. Computations are performed under the conditions of the laboratory tests with two different depths performed by Uijttewaal & Booij (2000). The present numerical model could reasonably predict fundamental aspects of turbulence flow features under different depths..
日本流体力学会の論文
2004-08-09