Abstract
The main purpose of this paper is to analyze the influence of different turbulence flow models on scouring pit of bridge-pier. Flow-3D software is applied in line with the purpose. The key motivation for this study is to contribute to the Flow-3D software by means of some modification and adjustment in the sediment scour model and shallow water model. An assessment of turbulence model adopted with the parameters of the Melville experiment to estimate the maximum scour-depth was performed. In the simulation results, the alternate eddy formation and shedding were repeated while the Karman vortex street formed behind the pier for the large eddy simulation LES turbulence model is more realistic in the flow phenomenon. The results of the scour development of large eddy simulation (LES) turbulence model were found to be more satisfied than the Renormalized group (RNG) turbulence model and close to the prior experiment results. The simulated scour results were significantly different with the observed data collected from previous literature in the reason of some unsuitability of meshing method in Flow-3D software.
Highlights
Pier, an important part of multi-span bridge, is very important for the safe operation of bridges
The alternate eddy formation and shedding were repeated while the Karman vortex street formed behind the pier for the large eddy simulation LES turbulence model is more realistic in the flow phenomenon
It can be observed that the red colors in both beside of cylindrical of both cases (RNG and LES turbulence model) have the highest velocity, while the blue color at the downstream behind the pier has the lowest velocity
Summary
An important part of multi-span bridge, is very important for the safe operation of bridges. It is generally caused by the interference of structures with river flows and characterized by the formation of a scour hole around the piers of bridges. It is necessary to make an accurate prediction of local scour of bridge piers. The collapse of a pier is caused by erosion of a gravel layer of the river channel and local scour at bridge pier that conducts a large scour of the river bed [6]. The study about the mechanical process of the bridge-scoured under flood condition and the development of an accurate safety evaluation method was proposed [7] [8]
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