Open Access

ARTICLE

A Numerical Study on the Mechanisms Producing Forces on Cylinders Interacting with Stratified Shear Environments

Yin Wang^1,*, Lingling Wang², Yong Ji¹, Zhicheng Xi¹, Wenwen Zhang¹

1 College of Water Conservancy and Ecological Engineering, Nanchang Institute of Technology, Nanchang, 330099, China
2 College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China

* Corresponding Author: Yin Wang. Email:

Fluid Dynamics & Materials Processing 2021, 17(2), 471-485. https://doi.org/10.32604/fdmp.2021.014652

Received 16 October 2020; Accepted 05 February 2021; Issue published 02 April 2021

Abstract

A three dimensional (3D) numerical wave flume is used to investigate carefully the ISWs (Internal solitary wave) forces acting on cylinders interacting with a stratified shear environment. Using the Large-Eddy Simulation (LES) approach and analyzing the distribution of shear stress and pressure along the surface of the cylinder, the differential pressure resistance and the viscous force are obtained. The method of multiple linear regression analysis is adopted and a comprehensive influence coefficient is determined accordingly to account for the dimensionless forces acting on the cylinder. Results show that the differential pressure resistance on a square cylinder is 1.5 times higher than that on a circular cylinder in the upper layer, while the differential pressure resistance on a square cylinder is 3.5 times larger than that on a circular cylinder in the lower layer. The viscous force is 1–2 orders of magnitude smaller than the differential pressure resistance, which means that the viscous force could be ignored. The comprehensive influence coefficient shows positive correlation with the relative wave height and negative correlation with upper and lower water depth ratio.

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Keywords

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