Breaking wave interaction with a vertical cylinder and the effect of breaker location

Kamath, Arun; Chella, Mayilvahanan Alagan; Bihs, Hans; Arntsen, Øivind Asgeir

doi:10.1016/j.oceaneng.2016.10.025

Cited by 99 publications

(57 citation statements)

References 30 publications

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“…Figure 5 shows the comparison of the present predicted free surface elevations η at the WG2 location and published data for the vertical cylinder. The present result is in good agreement with the experimental data and the numerical results from Choi et al [10] and Kamath et al [11] except for the slight discrepancy at around t/T = 31.1. This could be explained as given below.…”

Section: Validation Of the Numerical Modelsupporting

confidence: 93%

“…The computed breaking wave forces were in good agreement with the experimental data filtered by an FFT low-pass filter and EMD. Kamath et al [11] and Chella et al [12] studied the influence of wave breaking locations on the interactions between breaking waves and a vertical cylinder using the k − ω turbulence model. They pointed out that the largest total horizontal wave force was generated when the overturning wave tongue was just below the wave crest level and hit the cylinder.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles

Liu

Ong

et al. 2020

Applied Sciences

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The purpose of this paper is to numerically simulate the breaking wave past a standing cylinder with different transverse inclined angles. The numerical simulations are carried out by solving the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations with the k − ω SST turbulence model. The air-water interface is captured using the Volume of Fluid (VOF) method. The convergence studies on the grid and time-step are performed by examining the total horizontal breaking wave forces on the vertical cylinder. The present numerical results have been validated with the published experimental data. A good agreement is obtained between the present numerical results and the experimental data in terms of the surface elevation and the horizontal breaking wave force. Moreover, the total horizontal breaking wave force is decomposed into low-order and high-order wave forces through Fast Fourier Transform (FFT). It is observed that the free surface elevations in front of the cylinder and the normalized high-order wave force have a minimum value when the transverse inclined angle of the cylinder is 45 • . The secondary load causing the higher-harmonic ringing motion of structures is not observed when the cylinder is placed with the transverse inclined angles of 30 • and 45 • .

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Section: Validation Of the Numerical Modelsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles

Liu

Ong

et al. 2020

Applied Sciences

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“…Some of the CFD-based NWTs in the current literature are those presented by Yang and Stern [1], Jacobsen et al [2] in OpenFOAM, Higuera et al [3] in OpenFOAM and REEF3D presented by Bihs et al [4]. These NWTs have been used to simulate different phenomena such as spilling breaking waves [5,6], plunging breaking waves [7], breaking wave forces [8][9][10], wave loads [11][12][13], wave interaction with permeable coastal structures [14,15] and wave interaction with floating bodies [16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Different Methods for Wave Generation and Absorption in a CFD-Based Numerical Wave Tank

Miquel

Kamath

Chella

et al. 2018

JMSE

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In this paper, the performance of different wave generation and absorption methods in computational fluid dynamics (CFD)-based numerical wave tanks (NWTs) is analyzed. The open-source CFD code REEF3D is used, which solves the Reynolds-averaged Navier-Stokes (RANS) equations to simulate two-phase flow problems. The water surface is computed with the level set method (LSM), and turbulence is modeled with the k-ω model. The NWT includes different methods to generate and absorb waves: the relaxation method, the Dirichlet-type method and active wave absorption. A sensitivity analysis has been conducted in order to quantify and compare the differences in terms of absorption quality between these methods. A reflection analysis based on an arbitrary number of wave gauges has been adopted to conduct the study. Tests include reflection analysis of linear, second-and fifth-order Stokes waves, solitary waves, cnoidal waves and irregular waves generated in an NWT. Wave breaking over a sloping bed and wave forces on a vertical cylinder are calculated, and the influence of the reflections on the wave breaking location and the wave forces on the cylinder is investigated. In addition, a comparison with another open-source CFD code, OpenFOAM, has been carried out based on published results. Some differences in the calculated quantities depending on the wave generation and absorption method have been observed. The active wave absorption method is seen to be more efficient for long waves, whereas the relaxation method performs better for shorter waves. The relaxation method-based numerical beach generally results in lower reflected waves in the wave tank for most of the cases simulated in this study. The comparably better performance of the relaxation method comes at the cost of larger computational requirements due to the relaxation zones that have to be included in the domain. The reflections in the NWT in REEF3D are generally lower than the published results for reflections using the active wave absorption method in the NWT based on OpenFOAM.

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“…Geng et al (2014) and Geng and Boufadel (2015) studied the impact of on-shore wave breaking on groundwater flow using RANS with RNG k À ε model. Chella et al (2016) and Kamath et al (2016) investigated wave breaking over impermeable slopes and the interaction of wave breakers with a vertical cylinder, respectively. They both used the Wilcox k À ω model (Wilcox, 2008).…”

Section: Introductionmentioning

confidence: 99%

Oil Droplets Transport Under a Deep‐Water Plunging Breaker: Impact of Droplet Inertia

et al. 2018

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Oil droplets transport in a deep‐water plunging breaker of height 0.18 m was simulated by coupling computational fluid dynamics with Lagrangian particle tracking. The Reynolds‐averaged Navier‐Stokes equations were solved in a two‐dimensional vertical slice within the computational fluid dynamics code Fluent to reproduce the movement of breaking waves in the absence of wind stress and large‐scale turbulence. The generated plunging breaker generated two additional (residual) breakers, consistent with experimental observations from the literature. The hydrodynamics of the breaker was subsequently used as input to the Lagrangian particle tracking code, NEMO3D, where the equation of motion was solved for each droplet by incorporating the major local forces including those due to the mass of the droplet. The droplet sizes were selected to vary from 100 to 600 μm. It was found that the droplet plume split into three clouds, one below and upstream of the first breaker, one below the second breaker, and one downstream of the third breaker. The largest penetration depth was within the second cloud. The largest entrainment (fraction of surface mass in the water column) occurred for the 100‐μm droplets, while the smallest entrainment occurred for the 600 μm. However, the 300 μm exhibited smaller entrainment than smaller droplets, which is due to the vortical nature of the breaker, which advected the 300 μm horizontally and then upward. This has implications on the biodegradation and dissolution of droplets of various sizes, and on the application of countermeasures such as dispersant.

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Breaking wave interaction with a vertical cylinder and the effect of breaker location

Cited by 99 publications

References 30 publications

Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles

Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles

Analysis of Different Methods for Wave Generation and Absorption in a CFD-Based Numerical Wave Tank

Oil Droplets Transport Under a Deep‐Water Plunging Breaker: Impact of Droplet Inertia

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