Evaluating wave forces on groups of three and nine cylinders using a 3D numerical wave tank

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

doi:10.1080/19942060.2015.1031318

Cited by 23 publications

(13 citation statements)

References 33 publications

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“…More recently, Kamath et al (2015aKamath et al ( , 2015b reported CFD results of wave interaction with multiple vertical cylinders. They performed simulations using a k-ω turbulence model and observed unphysical wave damping based on RANS turbulence modelling.…”

Section: Introductionmentioning

confidence: 99%

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

Devolder

Rauwoens

Troch

2017

Coastal Engineering

128

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The objective of the present work is to investigate wave run-up around a monopile subjected to regular waves inside a numerical wave flume using the Computational Fluid Dynamics (CFD) toolbox OpenFOAM®. Reynolds-Averaged Navier-Stokes (RANS) turbulence modelling is performed by applying the k-ω SST model. Boundary conditions for wave generation and absorption are adopted from the IHFOAM toolbox. Simulations of propagating water waves show sometimes excessive wave damping (i.e. a significant decrease in wave height over the length of the numerical wave flume) based on RANS turbulence modelling. This anomaly is prevented by implementing a buoyancy term in the turbulent kinetic energy equation. The additional term suppresses the turbulence level at the interface between water and air. The proposed buoyancy-modified k-ω SST turbulence model results in an overall stable wave propagation model without significant wave damping over the length of the flume. Firstly, the necessity of a buoyancy-modified k-ω SST turbulence model is demonstrated for the case of propagating water waves in an empty wave flume. Secondly, numerical results of wave run-up around a monopile under regular waves using the buoyancy-modified k-ω SST turbulence model are validated by using experimental data measured in a wave flume by De Vos et al. (2007). Furthermore, timedependent high spatial resolutions of the numerically obtained wave run-up around the monopile are presented. These results are in line with the experimental data and available analytical formulations.

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Section: Introductionmentioning

confidence: 99%

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

Devolder

Rauwoens

Troch

2017

Coastal Engineering

128

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“…The numerical wave tank is validated for wave generation and propagation for waves of high and low steepnesses [13] [26] [14] and for the computation of wave forces [27]. The following sections present the results for wave forces evaluated for a single cylinder and linear arrays of two, three, four and five cylinders of diameter D = 0.5 m in a water depth d = 0.5 with incident waves of wavelength L = 2.0 m for heights H = 0.006 m (linear wave theory) and H = 0.15 m (5th-order Stokes wave theory).…”

Section: Resultsmentioning

confidence: 99%

CFD Simulations to Determine Wave Forces on a Row of Cylinders

Kamath

Bihs

Chella

et al. 2015

Procedia Engineering

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The open source Computational Fluid Dynamics (CFD) model REEF3D is used to simulate interaction of low steepness linear waves and high steepness 5th-order Stokes waves with a single cylinder and linear arrays of two, three, four and five large cylinders. The wave forces on any cylinder in the array is seen to generally increase with the inclusion of additional downstream cylinders in both cases. The wave forces on the downstream cylinders also reduce along the length of the array and the most downstream cylinder experiences the least forces in the array. The formation of standing waves in between the cylinders is observed in the case of low steepness incident waves. The wave forces on the most downstream cylinder in the array is almost equal to the force on a single cylinder in the case of low steepness incident waves and less than the force on a single cylinder in the case of high steepness incident waves.

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“…The mooring model is implemented in the open-source CFD code REEF3D [8]. The model has been used and validated for a wide range of marine applications, such as breaking wave kinematics [9], breaking wave forces [10] and sloshing [11]. For floating bodies, an extension of the local directional immersed boundary method [12] using the field extension method [13] is implemented.…”

Section: Omae2018-77776mentioning

confidence: 99%

Modeling and Simulation of Moored-Floating Structures Using the Tension Element Method

Martín

Kamath

Bihs

2019

Journal of Offshore Mechanics and Arctic Engineering

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The derivation of a discrete mooring model for floating structures is presented in this paper. The method predicts the steady-state solution for the shape of an elastic cable and the tension forces under consideration of static loads. It is based on a discretization of the cable in mass points connected with straight but elastic bars. The successive approximation is applied to the resulting system of equations which leads to a significant reduction of the matrix size in comparison to the matrix of a Newton–Raphson method. The mooring model is implemented in the open-source computational fluid dynamics (CFD) model REEF3D. The solver has been used to study various problems in the field of wave hydrodynamics and fluid–structure interaction. It includes floating structures through a level set function and captures its motion using Newton and Euler equations in six degrees-of-freedom (6DOF). The fluid–structure interaction is solved explicitly using an immersed boundary method based on the ghost cell method. The applications show the accuracy of the solver and the effects of mooring on the motion of floating structures.

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Evaluating wave forces on groups of three and nine cylinders using a 3D numerical wave tank

Cited by 23 publications

References 33 publications

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

CFD Simulations to Determine Wave Forces on a Row of Cylinders

Modeling and Simulation of Moored-Floating Structures Using the Tension Element Method

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