Breaking-Wave Interaction with Tandem Cylinders under Different Impact Scenarios

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

doi:10.1061/(asce)ww.1943-5460.0000343

Cited by 36 publications

(20 citation statements)

References 47 publications

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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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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

Self Cite

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“…In the present manuscript, the open‐source CFD code REEF3D is used. The model has been used extensively for complex wave hydrodynamics problems in the field of coastal and ocean engineering such as breaking waves , wave energy converter devices , non‐breaking wave forces , and breaking wave forces . A novel approach for the geometry description for the six degree of freedom (6DOF) algorithm is proposed.…”

Section: Introductionmentioning

confidence: 99%

A combined level set/ghost cell immersed boundary representation for floating body simulations

Bihs

Kamath

2016

Numerical Methods in Fluids

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4 SUMMARYA six degrees of freedom (6DOF) algorithm is implemented in the open-source CFD code REEF3D. The model solves the incompressible Navier-Stokes equations. Complex free surface dynamics are modeled with the level set method based on a two-phase flow approach. The convection terms of the velocities and the level set method are treated with a high-order WENO discretization scheme. Together with the level set method for the free surface capturing, this algorithm can model the movement of rigid floating bodies and their interaction with the fluid. The 6DOF algorithm is implemented on a fixed grid. The solid-fluid interface is represented with a combination of the level set method and ghost cell immersed boundary method. As a result, re-meshing or overset grids are not necessary. The capability, accuracy and numerical stability of the new algorithm is shown through benchmark applications for the fluid-body interaction problem. Copyright

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“…where p represents the pressure and τ is the normal component of the stress tensor. The numerical model has been used in the past for a wide range of marine applications such as wave-structure interaction [50,51], breaking wave forces [35], floating body dynamics [48], sloshing [52], irregular wave analysis [24,37,53] and sediment transport [54].…”

Section: Overview Of the Numerical Schemesmentioning

confidence: 99%

“…The numerical analysis is performed with the open-source hydrodynamics model REEF3D [34]. The numerical model has been successfully used to study various coastal and marine engineering problems [22,24,[35][36][37]. The present approach to reconstruct the irregular free surface elevation is based on the coupling of the Dirichlet inlet boundary condition with the irregular wave characteristics.…”

Section: Introductionmentioning

confidence: 99%

Free Surface Reconstruction for Phase Accurate Irregular Wave Generation

Aggarwal

Pákozdi

Bihs

et al. 2018

JMSE

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The experimental wave paddle signal is unknown to the numerical modellers in many cases. This makes it quite challenging to numerically reproduce the time history of free surface elevation for irregular waves. In the present work, a numerical investigation is performed using a computational fluid dynamics (CFD) based model to validate and investigate a non-iterative free surface reconstruction technique for irregular waves. In the current approach, the free surface is reconstructed by spectrally composing the irregular wave train as a summation of the harmonic components coupled with the Dirichlet inlet boundary condition. The verification is performed by comparing the numerically reconstructed free surface elevation with theoretical input waves. The applicability of the present approach to generate irregular waves by reconstructing the free surface is investigated for different coastal and marine engineering problems. A numerical analysis is performed to validate the free surface reconstruction approach to generate breaking irregular waves over a submerged bar. The wave amplitudes, wave frequencies and wave phases are modelled with good accuracy in the time-domain during the higher-order energy transfers and complex processes like wave shoaling, wave breaking and wave decomposition. The present approach to generate irregular waves is also employed to model steep irregular waves in deep water. The free surface reconstruction method is able to simulate the irregular free surface profiles in deep water with low root mean square errors and high correlation coefficients. Furthermore, the irregular wave forces on a monopile are investigated in the time-domain. The amplitudes and phases of the force signal under irregular waves generated by using the current technique are modelled accurately in the time-domain. The proposed approach to numerically reproduce the free surface elevation in the time-domain provides promising and accurate results for all the benchmark cases.

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Breaking-Wave Interaction with Tandem Cylinders under Different Impact Scenarios

Cited by 36 publications

References 47 publications

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

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

A combined level set/ghost cell immersed boundary representation for floating body simulations

Free Surface Reconstruction for Phase Accurate Irregular Wave Generation

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