IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME A: Engineering and Management of Fresh-water Systems : Turbulence statistics over rough bed
Turbulence statistics over rough bed
Author : Sevket Cokgor, E.Beyhan Yegen, Bihrat Onoz, İsmail Albayrak
Several disciplines such as mechanical, aerospace, and hydraulic engineering etc. have considerable engineering interest in turbulent boundary layers over roughness elements. In this study attention is focused on statistical properties of turbulence characteristics over relatively large random roughnesses. The data of velocities over rough bed have been analysed through a statistical perspective. A three component acoustic doppler was used for obtaining the measurements of velocity. Experiments show that the vortices which form in the holes between roughness elements are key to the process of flow rush into the holes between the elements. In the present study a statistical analysis is performed so as to support the experimental findings. The histograms of the time series of longitudinal and vertical velocities over the roughness elements have been drawn and the parameters of these time series have been given. The correlation between the shear stress on a horizontal plane right over the roughness elements and momentum flux through this plane is also investigated. Interpretations of the phenomena dependent on statistical findings are made.
File Size : 457,582 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME A: Engineering and Management of Fresh-water Systems
Date Published : 01/07/2007
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