Three-dimensional numerical simulation of local scour around circular bridge pier using Flow-3D software

Local scour is a common threat to structures such as bridge piers, abutments, and dikes that are constructed on natural rivers. To reduce the risk of foundation failure, the understanding of local scour phenomenon around hydraulic structures is important. The well-predicted scour depth can be used as a reference for structural foundation design and river management. Numerical simulation is relatively efficient at studying these issues. Currently, two-dimensional (2D) mobile-bed models are widely used for river engineering. However, a common 2D model is inadequate for solving the three-dimensional (3D) flow field and local scour phenomenon because of the depth-averaged hypothesis. This causes the predicted scour depth to often be underestimated. In this study, a repose angle formula and bed geometry adjustment mechanism are integrated into a 2D mobile-bed model to improve the numerical simulation of local scour holes around structures. Comparison of the calculated and measured bed variation data reveals that a numerical model involving the improvement technique can predict the geometry of a local scour hole around spur dikes with reasonable accuracy and reliability.

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3D Numerical Simulation of Sea-cross Bridge Pier Wave Current Force Considering Local Scour Effect

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/676/1/012142 ◽

2021 ◽

Vol 676 (1) ◽

pp. 012142

Author(s):

Chen Taoxiao ◽

Hu Jinchun ◽

Chen Gang ◽

Dong Weiliang ◽

Yue Shubo

Keyword(s):

Numerical Simulation ◽

Local Scour ◽

Bridge Pier ◽

3D Numerical Simulation ◽

Cross Bridge

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Numerical Simulation of Material Plastic Deformation Using the Drawing Forming Process of Contoured Internal Surface Tubes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.841.54 ◽

2020 ◽

Vol 841 ◽

pp. 54-58

Author(s):

Martin Necpal ◽

Erika Hodúlová ◽

Maroš Martinkovič

Keyword(s):

Numerical Simulation ◽

Three Dimensional ◽

Internal Surface ◽

Modern Technology ◽

Process Conditions ◽

Forming Process ◽

Rigid Plastic ◽

Seamless Steel Tubes ◽

3D Software ◽

Corner Filling

Production of multi-rifled seamless steel tubes employing cold draw process using multi-rifled mandrel is quite a modern technology. The important characteristic of the tube drawing process, unlike the tube with internal rifling, is the corner filling which influences the dimension accuracy of the internal shape of the tube. In this study, the influence of drawing tool dimensions and mandrel shape on to final rifling filling was investigated. Draw process has been simulated by using the three-dimensional rigid-plastic finite element method (FEM) by using DEFORM 3D software. The results of numerical simulation show that the shape of drawing tools and process conditions have a significant influence on the forming process and final shape and properties of the workpiece.

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Numerical Simulation of Temporal Evolution of Local Scour in Bridge Pier with Nonuniform Sediment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.3610 ◽

2011 ◽

Vol 250-253 ◽

pp. 3610-3614 ◽

Cited By ~ 1

Author(s):

Mohammad J. Aarabi ◽

Mohammad R. Chamani ◽

Amir A. Dehghani ◽

Keyvan Asghari

Keyword(s):

Numerical Simulation ◽

Time Variation ◽

Temporal Evolution ◽

Local Scour ◽

Bridge Pier ◽

Bridge Piers ◽

Nonuniform Sediment ◽

Natural Rivers

Due to economical and serviceability reasons, local scour must be considered in the design of bridge piers. Although beds of natural rivers consist of nonuniform sediments, but most researches in this subject were carried out with uniform sediments. In nonuniform sediments case, the effect of sheltering of the finer particles by the coarser ones may alter the scour process. In this paper, the time-variation of local scour with nonuniform sediments around a cylinder pier is simulated using SSIIM software. This study shows that the SSIIM is capable of predicting the temporal evolution of local scour in bridge piers with nonuniform sediments.

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Reduction of local scour around a bridge pier by using different shapes of pier slots and collars

Water Science & Technology Water Supply ◽

10.2166/ws.2020.022 ◽

2020 ◽

Vol 20 (3) ◽

pp. 1006-1015 ◽

Cited By ~ 2

Author(s):

A. Bestawy ◽

T. Eltahawy ◽

A. Alsaluli ◽

A. Almaliki ◽

M. Alqurashi

Keyword(s):

Three Dimensional ◽

Laser Scanner ◽

Local Scour ◽

Bridge Pier ◽

Bridge Piers ◽

Scour Depth ◽

Contour Maps ◽

Reduction Methods ◽

Analysis System ◽

Bridge Failure

Abstract Local scour around bridge piers is one of the main causes of bridge failure all over the world. Experimental and hydraulic models were carried out to investigate two types of scour reduction methods around a single cylindrical pier, namely the pier's slots and collars. The efficiency of various types of pier slots and circular collars around the pier's base in reducing scour were studied. A new shape of a conical collar was developed by the authors and examined along with other shapes. The results revealed that collars, in general, have more influence in reducing scour depth than slots made in the front and rear of bridge piers. The sigma-slot acts better than other tested slots, with a reduction in the scour depths of 59.3% and 52.8% at the upstream and downstream of the pier, respectively. On the other hand, the conical collar appeared to be the most effective collar shape in reducing the scour around the bridge pier, with a 61.1% reduction in the scour depth downstream of the pier. A three-dimensional laser scanner was used to capture the bed topography at the end of each experiment and contour maps of the deformed bed were produced. A one-dimensional Hydrologic Engineering Center-River Analysis System model was developed with a single bridge pier to predict the scour depth around the pier in an attempt to introduce new values for the pier nose shape factor, , which describes the tested piers.

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CFD Simulation of Local Scouring Around Bridge Pier

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.a1002.109119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 1870-1880

Keyword(s):

Cfd Simulation ◽

Flow Behavior ◽

Experimental Studies ◽

Three Dimensional ◽

Local Scour ◽

Bridge Pier ◽

Bridge Piers ◽

Multiphase Model ◽

Model Studies ◽

Dimensional Simulation

The threat of local scour around bridge piers has been in research for many years. According to the various studies, local scour around the bridge pier is the prime cause for most of the bridge failures. The main objective of the present study was to investigate the flow behavior and the scour phenomenon around the bridge piers of various shapes namely Circular, Elliptical, Square and Streamlined. Local scouring depends on various factors like depth of flow, upstream flow conditions, pier shape and dimensions. Here, we have taken only pier shape as the primary factor and kept other factors constant. The numerical simulations were even carried out using CFDFluent, Eulerian multiphase model, k–epsilon turbulence model, to elaborate the physics behind the scour formation. CFD simulation tool can be used for wide understanding of the flow behavior around the bridge piers even without physical model studies because it saves time and money as compared to experimental studies. Three dimensional simulation of flow behavior around four pier shapes indicates that the streamlined pier is the most efficient pier to use as it allows the flow to pass smoothly around it creating less obstruction to the flow and hence creating less chances of local scouring near the pier toe.

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