Irregular Wave Forces on a Large Vertical Circular Cylinder

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

doi:10.1016/j.egypro.2016.09.223

Cited by 28 publications

(11 citation statements)

References 18 publications

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“…The verification of the model is then conducted through comparing single‐point measured (ADV) and simulated velocity energy spectra. For more details on irregular wave generation in REEF3D, see, for example, Aggarwal, Chella, Kamath, and Bihs ().…”

Section: Methods Of the Proposed Frameworkmentioning

confidence: 99%

A practical framework to assess the hydrodynamic impact of ship waves on river banks

Fleit

Baranya

Krámer

et al. 2019

River Research & Apps

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The temporal alteration of the hydrodynamic regime in rivers due to navigation has significant effects on riverine ecosystems. Most of the key mechanisms and interactions between hydrodynamic and ecological variables have already been revealed; however, the quantitative evaluation of biotic and abiotic variables still stands a challenge. This paper aims to present a thorough, spatiotemporal framework, involving field and computational tools, for the assessment of wave hydrodynamics in the littoral zone of rivers, where its ecological relevance is the most significant. The temporal variation of significant wave heights is derived from high-frequency pressure measurements, offering a well-comparable statistical evaluation of individual wave events considering the duration of different wave intensities. Acoustic Doppler velocimetry (ADV) is used for the assessment of near-bank velocities, from which the secondary wave-related components have been filtered offering relevant validation data for numerical modelling. The small footprint of the ADVs is extended with up-to-date computational fluid dynamics modelling. Wave spectra derived from the pressure measurements are used as boundary conditions for phase-resolved irregular wave modelling with the level set method based numerical model REEF3D. The properly validated model offers the assessment of the most relevant hydrodynamic variables (e.g., velocity or turbulent kinetic energy) in a spatially extended manner, from which the hydrodynamic footprint of the wave events can be interpreted in a statistical fashion. The implementation of the proposed framework is illustrated through a case study at a Hungarian section of the Danube River.

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Section: Methods Of the Proposed Frameworkmentioning

confidence: 99%

A practical framework to assess the hydrodynamic impact of ship waves on river banks

Fleit

Baranya

Krámer

et al. 2019

River Research & Apps

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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%

“…Many researchers in the past have applied CFD (Computational Fluid Dynamics) based numerical models to study different types of non-breaking and breaking waves [18][19][20][21][22]. The CFD models have been validated for irregular waves generated using the random phases in the frequency-domain [23][24][25][26]. Few researchers have made attempts to reconstruct the experimental non-breaking and breaking irregular waves in the time-domain without experimental wavemaker inputs.…”

Section: Introductionmentioning

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%

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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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“…Article [6] investigated numerical simulation (CFD) of the interaction between waves and a vertical cylinder. The Reynolds equation of the averaged turbulent fluid flow is solved (Reynolds Averaged Navier-Stokes, RANS).…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%