Scour at Submerged Cylindrical Obstacles under Steady Flow
| Autor: | Subhasish Dey, Abhishek Ghosh Roy, Rajkumar V. Raikar |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Hydraulics
Mechanical Engineering Flow (psychology) Mechanics Vorticity Quantitative Biology::Other Open-channel flow law.invention Cylinder (engine) Physics::Fluid Dynamics law Free surface Horseshoe vortex Geotechnical engineering Sediment transport Physics::Atmospheric and Oceanic Physics Geology Water Science and Technology Civil and Structural Engineering |
| Zdroj: | Journal of Hydraulic Engineering. 134:105-109 |
| ISSN: | 1943-7900 0733-9429 |
| DOI: | 10.1061/(asce)0733-9429(2008)134:1(105) |
| Popis: | Results of an experimental study on clear-water scour at submerged cylindrical obstacles (circular cylinders) in uniform bed sediments under steady flow are presented. The scour depths at submerged circular cylinders are compared with the scour depths at corresponding unsubmerged cylinders (extended above the free surface of flow) of the same diameters under similar flow and bed sediment conditions. The scour depth decreases with an increase in submergence ratio. A submergence factor is introduced to determine the scour depth at a submerged cylinder from the information of the scour depth at an unsubmerged cylinder of the same diameter. In addition, the flow fields along the upstream vertical plane of symmetry of unsubmerged and submerged cylinders are presented through vector plots, which reveal that the dimension and strength of the horseshoe vortex decreases with an increase in submergence ratio. The horseshoe vortex circulations, which decrease with an increase in submergence ratio, are computed from the vorticity contours by using the Stokes theorem. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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