SHEAR STRUCTURES OF LONGITUDNAL CROSS-SECTION IN NEAR-WALL TURBULENCE

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  • 壁乱流の縦断面せん断構造
  • ヘキ ランリュウ ノ ジュウダン メンセンダンコウゾウ

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The shear structure of longitudinal cross-section in the near-wall region of turbulent open channel flow is investigated by using the flow visualization technique which combines dye streak injection with Particle Tracking Velocimetry. The formation and magnitude of u and v high-velocity shear play a very important role to form coherent motion in the near-wall region. Lift-up process of low speed steraks in bursting associates with positive-high du/dy and high dv/dx. Further, roll up motions of the transverse vortices in log-region depend on the positive-high dv/dx.

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