Turbulent Drag Reduction in a d-Type Rough Wall Boundary Layer with Longitudinal Thin Ribs Placed within Traverse Grooves : Higher-Order Moments and Conditional Sampling Analysis

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概要

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• Large-scale coherent motions were investigated experimentally in a d-type rough wall boundary layer modified with longitudinal thin ribs. Higher-order moments and conditional averaged statistics were obtained at R_θ=1 300 and 5 000, where the local skin friction coefficients of modified flow are the same as and about 17% larger than those of smooth wall flow. The magnitude of triple velocity correlations is reduced in most of the layer by drag reduction control using longitudinal thin ribs. The higher-order moments and conditional averaged signals obtained by the VITA analysis show that the turbulence production model with a pair of streamwise vortices interacting with outflow from the roughness grooves is reasonable.

• 一般社団法人日本機械学会の論文
• 1996-08-15

著者

• Osaka Hideo

  Faculty Of Engineering Yamaguchi University

• MOCHIZUKI Shinsuke

  Faculty of Engineering, Yamaguchi University

• IZAWA Akimine

  Mitsubishi Heavy Industries

• Mochizuki Shinsuke

  Faculty Of Engineering Yamaguchi University

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• Vortex Structures around a Flat Paddle Impeller in a Stirred Vessel
• Turbulent Drag Reduction in a d-Type Rough Wall Boundary Layer with Longitudinal Thin Ribs Placed within Traverse Grooves : Higher-Order Moments and Conditional Sampling Analysis
• Re-examination of the Reynolds-Number-Effect on the Mean Flow Quantities in a Smooth Wall Turbulent Boundary Layer
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• Effects of Splitter Plates on Turbulent Quantities on a Boundary Layer Developing on a Flat Plate near the Trailing Edge
• The spanwise non-uniformity of nominally two-dimensional turbulent boundary layer : 1st Report Characteristics of spanwise velocity distribution

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