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 : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Large eddy simulations and analyses for bridge scour development
Large eddy simulations and analyses for bridge scour development
Author : HAYDER MAJEED (1), NIGEL WRIGHT (2) & ANDREW SLEIGH (3)
ABSTRACT
Bridge scour has been identified the main cause of bridge failures. The loss of soil around bridge pier may leave the
bridge with inadequate support and consequent complete failure of the bridge may occur. In this study the complicated
three dimensional scour patterns around bridge piers will be described numerically based on computational fluid
dynamics (CFD) using large eddy simulation (LES) to simulate the flow field around the bridge pier and calculate the
shear stress which will be considered the key parameter to control on the sediment motion in scour process. Then a
moving mesh technique will be used to simulate accurately the change in the river bed at each time step. A user-defined
function in the CFD software will be used to compare the shear stress calculated from large eddy simulation with the
critical shear stress which initiates sediment transportation. Once the critical shear stress is exceeded, the movable
sediment near to the pier will immediately happen. The influence of pier shape and the angle of attack of the flow around
the bridge pier on the scour behavior are the main parameters considered in this study
File Size : 968,973 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 27/08/2015
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