多形状结构上的湍流各向异性和长度尺度变化

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-02-24 DOI:10.1115/1.4057007

Pankaj Kumar Raushan, S. K. Singh, K. Debnath

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引用次数: 0

摘要

在水槽装置中，对三种不同立方体形状的床上钝体的湍流特性进行了实验研究。研究了稳态和脉动流场，分析了钝体转角半径和形状对湍流结构的影响，特别是在尾流区。研究发现，尖角区对流动分离有显著影响，并改变了剪切层流动的特性。特别是，观察到几何结构的相对细微变化导致尾流中平均流量的显著变化。对于不同的立方体结构，使用湍流三角形分析了流动的各向异性性质。给出了淹没障碍物近尾流区和远尾流区湍流长度尺度的变化。

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Turbulent anisotropy and length scale variation over multiple shaped structure

The turbulent flow characteristics over bed-mounted three different cubical shape bluff bodies is examined experimentally in the water channel facility. The steady and fluctuating flow fields are investigated to analyse the effect of corner radius and shapes of the bluff body on turbulent flow structure, particularly in the wake region. It is found that the sharp corner region, significantly impacts the flow separation and alters the characteristics of the shear-layer flow. In particular, the relatively subtle change in geometry resulted in a remarkable variation of the mean flow in the wake is observed. The anisotropic nature of flow is analysed using the turbulence triangle for the different cubical structures. The variation of the turbulent length scales are presented in the near and far wake region of the submerged obstacles.

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来源期刊

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme 工程技术-工程：大洋

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Offshore Mechanics and Arctic Engineering is an international resource for original peer-reviewed research that advances the state of knowledge on all aspects of analysis, design, and technology development in ocean, offshore, arctic, and related fields. Its main goals are to provide a forum for timely and in-depth exchanges of scientific and technical information among researchers and engineers. It emphasizes fundamental research and development studies as well as review articles that offer either retrospective perspectives on well-established topics or exposures to innovative or novel developments. Case histories are not encouraged. The journal also documents significant developments in related fields and major accomplishments of renowned scientists by programming themed issues to record such events. Scope: Offshore Mechanics, Drilling Technology, Fixed and Floating Production Systems; Ocean Engineering, Hydrodynamics, and Ship Motions; Ocean Climate Statistics, Storms, Extremes, and Hurricanes; Structural Mechanics; Safety, Reliability, Risk Assessment, and Uncertainty Quantification; Riser Mechanics, Cable and Mooring Dynamics, Pipeline and Subsea Technology; Materials Engineering, Fatigue, Fracture, Welding Technology, Non-destructive Testing, Inspection Technologies, Corrosion Protection and Control; Fluid-structure Interaction, Computational Fluid Dynamics, Flow and Vortex-Induced Vibrations; Marine and Offshore Geotechnics, Soil Mechanics, Soil-pipeline Interaction; Ocean Renewable Energy; Ocean Space Utilization and Aquaculture Engineering; Petroleum Technology; Polar and Arctic Science and Technology, Ice Mechanics, Arctic Drilling and Exploration, Arctic Structures, Ice-structure and Ship Interaction, Permafrost Engineering, Arctic and Thermal Design.