Numerical analysis of the interaction of irregular waves with two dimensional permeable coastal structures

Jacobsen, Niels Gjøl; Gent, Marcel R.A. van; Wolters, Guido

doi:10.1016/j.coastaleng.2015.05.004

Cited by 66 publications

(35 citation statements)

References 46 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

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“…Flow features in the third dimension do not seem to play a relevant role in porous regions. According to Jacobsen et al [31], 3D numerical models could show minor improvements in the accuracy, with a much higher computational cost. However, a 2D numerical model aggravates a phenomenon described by Jacobsen et al [24], where air pockets trapped between the water flow and solid contours may show unphysical behavior because of its incapability of mixing both fluid phases, which may lead to overestimation of pressures exerted by the air on solid structures.…”

Section: Numerical Modelmentioning

confidence: 99%

Influence of Parapets on Wave Overtopping on Mound Breakwaters with Crown Walls

et al. 2019

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Background literature on the influence of parapets on the overtopping of mound breakwaters is limited. In this study, numerical tests were conducted using computational fluid dynamics (CFD) to analyze the influence of nine crown wall geometries (seven with parapets). The CFD model was implemented in OpenFOAM ® and successfully validated with laboratory tests. A new estimator of the dimensionless mean wave-overtopping discharges (logQ) on structures with parapets is proposed. The new estimator depends on the estimation of logQ of the same structure without a parapet. The effects on wave overtopping of the parapet angle (ε p ), parapet width (w p ), and parapet height (h p ) were analyzed. Low values of ε p and w p /h p ≈ 1 produced the highest parapet effectiveness to reduce the mean wave-overtopping discharges.

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“…Previous works show that this term has minor effects in most of the cases, e.g. in del Jesus (2011) and Jacobsen et al (2015). Actually the inertia force on a fishing net panel should be a small part of the total force, since the ratio between magnitude of inertia force and drag force for a twine of unit length in periodic unsteady flow was expressed as (see Eq.…”

Section: Inertia Force For Flow Through Fishing Netsmentioning

confidence: 99%

“…Application of a turbulence model may introduce dual turbulence dissipation. This is considered to be a valid approximation in many engineering applications and it was also applied in Jensen et al (2014) and Jacobsen et al (2015). However one should notice that by doing so, the flow in the wake was not described in a correct way by the numerical model, where the turbulence generated behind the fishing nets was not resolved.…”

Section: Turbulence Effects For Flow Through Fishing Netsmentioning

confidence: 99%

Investigations on the porous resistance coefficients for fishing net structures

Chen

Christensen

2016

Journal of Fluids and Structures

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The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair.

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Numerical analysis of the interaction of irregular waves with two dimensional permeable coastal structures

Cited by 66 publications

References 46 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

Influence of Parapets on Wave Overtopping on Mound Breakwaters with Crown Walls

Investigations on the porous resistance coefficients for fishing net structures

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