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Mathematical Problems in Engineering
Volume 2016, Article ID 9086246, 15 pages
Research Article

A Numerical Study of the Forces on Two Tandem Cylinders Exerted by Internal Solitary Waves

1State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
2College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
3College of Water Conservancy and Ecological Engineering, Nanchang Institute of Technology, Nanchang 330099, China
4College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China

Received 20 January 2016; Revised 9 May 2016; Accepted 22 May 2016

Academic Editor: Maurizio Brocchini

Copyright © 2016 Yin Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A three-dimensional numerical wave flume is employed to investigate the forces exerted by internal solitary waves (ISWs) on a pair of circular cylinders in tandem arrangement, using large-eddy simulation (LES) model. The effect of the centre-to-centre distance (L) ranging from 1.5 to 5 diameters (D) is studied for various ISWs amplitudes () in the two-layer fluid system. Vertical-averaged vorticity distribution and vertical-averaged pressure gradient distribution in each layer are presented to investigate the different hydrodynamic interference between cylinders and the ISWs forces on each cylinder at various L. Furthermore, the force behaviors of the two cylinders are also compared with that of an isolated cylinder in the same environment. The interaction between the two piles occurs in both layers, and it is found that, for , strong mutual interference appears between two cylinders; for , the two cylinders continue to influence each other in a weak-interference state; for , the interaction gradually decreases into a noninteracting state. This paper tries to provide some references to structural arrangement of double-cylinder structure and grouped-cylinder structure in stratified flow environment.