AM05-20-009 開水路に置かれた角柱周辺の流れと水位変動に関する数値計算(乱流の予測とモデリング2,一般講演)

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This paper describes the comparisons of numerical models focusing on the water elevation around a bridge pier. Three different numerical models, namely, 2D plane model, Qasi-3D model (3D model with hydrostatic assumption) and Full-3D model, are considered. As turbulence models, simple 0-equation models with linear and non-linear constitutive equations are used for the 2D plane model and a non-linear k-ε model with effects of strain and rotation parameters are applied for the quasi-3D and full-3D models. First, laboratory test is carried out to obtain data for verification under Re=8400 and Fr=0.54. The computations are performed in the same conditions of the laboratory test. The numerical results show that the 2D and full 3D models can capture well the height of water elevation at the upstream region of the cylinder though the quasi-3D model under-predicts it. The 2D model overestimates the depth of the hollow behind the cylinder. The quasi-3D model considerably over-estimates the length of the re-circulation zone.
日本流体力学会の論文
2005-09-05