Open Access

ARTICLE

Numerical Analysis of the Influence of the Impinging Distance on the Scouring Efficiency of Submerged Jets

Hao Chen^1,2, Xianbin Teng^2,*, Zhibin Zhang², Faxin Zhu¹, Jie Wang¹, Zhaohao Zhang²

1 School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan, 316022, China
2 School of Marine Engineering, Guangzhou Maritime University, Guangzhou, 510725, China

* Corresponding Author: Xianbin Teng. Email:

(This article belongs to the Special Issue: High Pressure Jet Theory and its Applications)

Fluid Dynamics & Materials Processing 2024, 20(2), 429-445. https://doi.org/10.32604/fdmp.2023.030585

Received 13 April 2023; Accepted 15 August 2023; Issue published 14 December 2023

Abstract

Water jet technology is widely used in submerged buried pipes as a non-traditional trenching process, often involving a complex sediment response. An important adjustable and influential engineering variable in this technology is represented by the impinging distance. In this study, the FLOW-3D software was used to simulate the jet scouring of sand beds in a submerged environment. In particular, four sets of experimental conditions were considered to discern the relationship between the maximum scour depth and mass and the impinging distance. As shown by the results, a critical impinging distance exists by which the static scour depth can be maximized; the scour mass ratio between dynamic and static conditions decreases as the impinging distance increases. Moreover, the profile contours are similar when the erosion parameter is in the range 0.35 <  < 2. Empirical equations applicable for predicting the jet trenching contour under both dynamic and static scour modes are also provided in this study.

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