The Open Civil Engineering Journal




ISSN: 1874-1495 ― Volume 13, 2019
RESEARCH ARTICLE

Simulations of Local Scour Around a Cylindrical Bridge Pier And a Semicircular Abutment Using Unsteady k-ε Model Combined with σ-Grid



Shi Liu1, *, Yi Yang1, Xiaobo Wu2
1 Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou, Guangdong, China
2 Wuhan DaCheng Construction Consulting Co., Ltd., Wuhan, Hubei, China.

Abstract

Introduction:

Bridge scour is one of the major causes of bridge failure. Prediction of the maximum depth and shape of local scour plays an important role in bridge design and maintenance. In this paper, k-ε turbulent model combined with wall function was employed and complex flow fields are exhibited. The bed load transport model summarized by Qian and Wan [1] was applied to evaluate the development of local scour. Besides, σ-grid module was developed and embedded into the commercial solver FLUENT to fit the change of channel-bed.

Method:

In this module, the change of the elevation of the channel bed is calculated through using user defined functions(UDF), and the motion of the grid system is realized based on a program developed through C++ language, which extends the applications of FLUENT. The evolution of local scour hole for two cases, i.e., local scour around a cylindrical pier and a semicircular abutment, was simulated.

Results and Conclusion:

The depth and the shape of local scour as well as the flow fields were predicted. Numerical result conforms well to the experimental measurement. Especially, it provides fairly reasonable prediction on the key issue of the maximum scour depth. The satisfactory agreement validates the numerical method developed in the present study. In addition to the validation purpose, the different performance of this method for predicting local scour around the cylindrical pier and the semicircular abutment was discussed.

Keywords: local scour, k-ε model, bridge pier, abutment, σ-grid, sediment transportation, FLUENT.


Article Information


Identifiers and Pagination:

Year: 2017
Volume: 11
First Page: 598
Last Page: 614
Publisher Id: TOCIEJ-11-598
DOI: 10.2174/1874149501711010598

Article History:

Received Date: 02/02/2017
Revision Received Date: 13/03/2017
Acceptance Date: 19/05/2017
Electronic publication date: 28/07/2017
Collection year: 2017

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© 2017 Liu et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address to correspondence to this author at Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou, Guangdong, China; Tel: (+86)18627931026; E-mail: 280071216@qq.com


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