Vortex shedding and evolution induced by a solitary wave propagating over a submerged cylindrical structure

Zarruk, Gustavo A.; Cowen, Edwin A.; Wu, Tso-Ren; Liu, Philip L.‐F.

doi:10.1016/j.jfluidstructs.2014.11.001

Cited by 21 publications

(3 citation statements)

References 24 publications

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“…The purpose of most research is often two important issues: studies on wave reflection, transmission, and dissipation (RTD) coefficients Technical Editor: Erick Franklin. [1][2][3][4][5], and the generation and evolution of vortices in the vicinity of a submerged obstacle under solitary waves [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of flow structures of a solitary wave over two rectangular tandem obstacles

pour

Nili-Ahmadabadi

Zaghian

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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In this research, interactions between a solitary wave and two submerged rectangular obstacles with different distances were studied experimentally. The particle image velocimetry (PIV) technique was used to measure the velocity field on the weather and lee sides of the two obstacles. Two submerged rectangular obstacles with 12-cm height and 8-cm length were installed in an open water channel with 7-m length. The velocity fields were obtained with 5 fields of view (FOVs) and then synchronized together. The vortices that formed on the weather and lee sides of the rear and front obstacles were compared to each other. It was found that the vortex on the weather side of the rear obstacle was flatter and smaller than that on the weather side of the front obstacle. Moreover, the weather-side vortex of the front obstacle grew more. After the wave passes over the two obstacles, the vortices on the weather and lee sides of the front obstacle are merged together and form a larger vortex. A higher vorticity at the center of the weather side vortex of the front obstacle was observed. By increasing the distance between the obstacles, the vortex between the obstacles expands more, and the interaction of the flow with the obstacles is more intensive so that more and larger vortices are formed. These vortices depreciate the wave energy. The measurement of the wave height before and after the obstacles showed that the larger the distance between the obstacles, the higher wave energy loss will be. Keywords Solitary wave • Clockwise vortex • Two obstacles • PIV technique Abbreviationsh Water depth H Wave amplitude b Width of channels ρ Water density g Gravity η Free surface elevation t Time t * Dimensionless time c Wave speed E Total energy of the wave A Vortex area ω Vorticity Г Circulation * Mahdi Nili-Ahmadabadi

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Section: Introductionmentioning

confidence: 99%

Experimental study of flow structures of a solitary wave over two rectangular tandem obstacles

pour

Nili-Ahmadabadi

Zaghian

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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“…They revealed various features including the separation vortices, large free surface deformations, and flow fields. In recent years, Zarruk [16] utilized a numerical model combining the Volume of Fluid and Large Eddy Simulation (VOF-LES) to study the vortex shedding and evolution in the process of a solitary wave passing across a submerged cylindrical structure.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Solitary Wave Interaction with a Submerged Semicircular Cylinder

Wang

Zhang

2019

Mathematical Problems in Engineering

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The propagation on submerged structures of solitary wave, as a typical nonlinear wave, has guiding significance for the design and operation of coastal engineering. This paper presents a numerical model based on Navier-Stokes equations to study the interaction of the solitary wave with a submerged semicircular cylinder. A multiphase method is utilized to deal with water and air phase. The model uses the CIP (Constrained Interpolation Profile) method to solve the convection term of the Navier-Stokes equations and the THINC (Tangent of Hyperbola for Interface Capturing) scheme to capture the free surface. Three representative cases different in relative solitary wave height and structure size are simulated and analyzed by this model. By comparing the surface elevations at wave gauges with the experimental data and the documented numerical results, the present model is verified. Then, the wave pressure field around the submerged semicircular cylinder is presented and analyzed. At last, the velocity and vorticity fields are demonstrated to elucidate the characteristics of wave breaking, flow separation, and vortex generation and evolution during the wave-structure interaction. This work presents the fact that this numerical model combining the CIP and THINC methods has the ability to give a comprehensive comprehension of the flow around the structure during the nonlinear interaction of the solitary wave with a submerged structure.

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“…1 Kaplon 2 studied the different types of cables based on catenary equation and derived the analytical expressions of cable tension distribution and geometry. Zarruk et al 3 used a set of parameters to approximate the external excitation of the anchor cable, taking into account external forces. The above catenary method ignores some external forces such as the fluid force acting on the mooring cable and is an approximate solution to the practical problem after simplification.…”

Section: Introductionmentioning

confidence: 99%

Stochastic dynamic response analysis of submerged multi-body structure considering the uncertainty of connection gap

Zhou

Fang

et al. 2019

Noise & Vibration Worldwide

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The aim of this study is to determine the stochastic dynamic characteristics of the system due to the uncertainty of the gap contact between the mooring cable and the structural body of the submerged multi-body structure. The sag effect caused by the light, flexible, and low damping characteristics of the mooring cable and its dynamic elongation under the action of the flow field and the impact of the gap connection is considered. The sag effect is corrected using the equivalent elastic modulus method; the stochastic generalized non-deterministic dynamic model of the system considering the dynamic elongation and clearance contact of the mooring cable is established; and the Newmark-β method and the interval algorithm are used to solve the problem. The calculation results show that the mean and peak values of the kinematic parameters of the structure are larger than the ideal articulated state; the dynamic tension is changed randomly; and the deflection angle of the gap-contact state is greater than that of the articulated state, which may lead to the instability of the system. Therefore, when studying the concrete structure in water, we should consider the contact state of the joint and analyze its stochastic dynamic characteristics.

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Vortex shedding and evolution induced by a solitary wave propagating over a submerged cylindrical structure

Cited by 21 publications

References 24 publications

Experimental study of flow structures of a solitary wave over two rectangular tandem obstacles

Experimental study of flow structures of a solitary wave over two rectangular tandem obstacles

Numerical Study of Solitary Wave Interaction with a Submerged Semicircular Cylinder

Stochastic dynamic response analysis of submerged multi-body structure considering the uncertainty of connection gap

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