Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

doi:10.1007/s11709-023-0943-4

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (4) : 546-565 https://doi.org/10.1007/s11709-023-0943-4

RESEARCH ARTICLE

Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

Jiujiang WU^1,²(

), Lingjuan WANG³, Qiangong CHENG⁴

¹. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, China
². Department of Civil and Environmental Engineering, Western University, London, ON N6A 5B9, Canada
³. Office of International Students Education, Southwest University of Science and Technology, Mianyang 621010, China
⁴. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China

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Abstract

Scouring is one of the primary triggers of failure for bridges across rivers or seas. However, research concerning the scour mechanism of multi-wall foundations (MWFs) remains scarce, hindering the further application of MWFs. In this study, for the first time, the scouring effect caused by unidirectional flow around MWFs was examined numerically using FLOW-3D involving a large-eddy simulation. Initially, the applicability of the scouring model and input parameters was validated using a case study based on published measured data. Subsequently, the scouring effects of four MWFs with different wall arrangements and inflow angles, including the flow field analysis and scour pit and depth, were investigated thoroughly. It was found that the maximum scour depth of MWFs with an inflow angle of 0° was smaller than that of those with an inflow angle of 45°, regardless of the wall arrangement. Meanwhile, changing the inflow angle significantly affects the scour characteristics of MWFs arranged in parallel. In practical engineering, MWFs arranged in parallel are preferred considering the need for scouring resistance. However, a comparative analysis should be performed to consider comprehensively whether to adopt the form of a round wall arrangement when the inflow angle is not 0° or the inflow direction is changeable.

Keywords multi-wall foundation current-induced scour bridge foundation large-eddy simulation numerical analysis

Corresponding Author(s): Jiujiang WU

About author:

^* These authors contributed equally to this work.

Just Accepted Date: 22 February 2023 Online First Date: 19 May 2023 Issue Date: 25 June 2023

Cite this article:

Jiujiang WU,Lingjuan WANG,Qiangong CHENG. Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation[J]. Front. Struct. Civ. Eng., 2023, 17(4): 546-565.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0943-4
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I4/546

Fig.1 Demonstration of MWF: (a) general view; (b) parallel wall arrangement; (c) round wall arrangement.

Tab.1 Parameter setup of the numerical validation model

Fig.2 Computing domain and mesh.

Fig.3 Local scour pit development: (a) 0 min; (b) 5 min; (c) 20 min, and (d) 60 min.

Fig.4 Local scour depth development at the upstream edge of the pile.

Fig.5 Local scour depth development at the downstream edge of the pile.

Fig.6 Numerical model of MWF subjected to current-induced scour.

Fig.7 MWF models adopted in the numerical analysis (unit: m).

Fig.8 Cross-sectional view of the single-column streamline: (a) MWF-pr0; (b) MWF-pr45; (c) MWF-rr0; (d) MWF-rr45.

Fig.9 Flow velocity field: (a) MWF-pr0; (b) MWF-pr45; (c) MWF-rr0; (d) MWF-rr45.

Fig.10 Scour development for MWF-pr0: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.11 Plan view of the scour pit for MWF-pr0 at different times: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.12 Scour development for MWF-pr45: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.13 Plan view of the scour pit for MWF-pr45 at different times: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.14 Scour development for MWF-rr0: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.15 Plan view of the scour pit for MWF-rr0 at different times: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.16 Scour development for MWF-rr45: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.17 Plan view of the scour pit for MWF-rr45 at different times: (a) 120 s; (b) 300 s; (c) 600 s; (d) 1200 s; (e) 2400 s; (f) 3600 s.

Fig.18 Scour depth layout of MWF-pr0: (a) current direction and (b) direction perpendicular to the current.

Fig.19 Scour depth layout of MWF-pr45: (a) current direction and (b) direction perpendicular to the current.

Fig.20 Scour depth layout of MWF-rr0: (a) current direction and (b) direction perpendicular to the current.

Fig.21 Scour depth layout of MWF-rr45: (a) current direction and (b) direction perpendicular to the current.

Fig.22 Comparison of the maximum scour depths.

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