On the accuracy of internal wave generation method in a non-hydrostatic wave model to generate and absorb dispersive and directional waves

Vasarmidis, Panagiotis; Stratigaki, Vicky; Suzuki, Tomohiro; Zijlema, Marcel; Troch, Peter

doi:10.1016/j.oceaneng.2020.108303

Cited by 6 publications

(5 citation statements)

References 48 publications

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“…In Figure 5, the present results are also compared with the results in Vasarmidis et al [27], who replicated the same experiment using the non-hydrostatic wave model SWASH, and the numerical results in Raoult et al [30], who drew a comparison only in Transect T4. The numerical results of both models seem to predict the experimental measurements quite satisfactorily; however, the present study's results seem to be even more accurate especially in transects T2 and T3.…”

Section: Waves Propagation Over An Elliptical Shoalmentioning

confidence: 69%

“…To validate the present numerical model, two benchmark cases of regular waves were selected to demonstrate the ability of the model to simulate complex 3D wave transformations due to the simultaneous effects of wave refraction and diffraction. This experiment has also been reproduced by 2D depth-integrated, non-hydrostatic models for the simulation of coastal waves over varying bathymetries [25][26][27]. It should be noted that the performance of the above mentioned models was good, but they underestimated the wave height behind the shoal.…”

Section: Waves Propagation Over An Elliptical Shoalmentioning

confidence: 73%

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A Hybrid Parallel Numerical Model for Wave-Induced Free-Surface Flow

Leftheriotis

Chalmoukis

Oyarzun

et al. 2021

Fluids

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An advanced numerical model is presented for the simulation of wave-induced free-surface flow, utilizing an efficient hybrid parallel implementation. The model is based on the solution of the Navier–Stokes equations using large-eddy simulation of large-scale coastal free-surface flows. The three-dimensional immersed boundary method was used for the enforcement of the no-slip boundary condition on the bed surface. The water-air interface was tracked using the level-set method. The numerical model was effectively validated against laboratory measurements involving wave propagation over a flatbed with an elliptical shoal, whose presence induces combined wave refraction and diffraction phenomena. The parallel implementation of the model enabled the efficient simulation of depth-resolved, wave-induced, three-dimensional, free-surface flow; the model parallel efficiency and strong scaling are quantitatively demonstrated.

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Section: Waves Propagation Over An Elliptical Shoalmentioning

confidence: 69%

Section: Waves Propagation Over An Elliptical Shoalmentioning

confidence: 73%

A Hybrid Parallel Numerical Model for Wave-Induced Free-Surface Flow

Leftheriotis

Chalmoukis

Oyarzun

et al. 2021

Fluids

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“…A sponge layer with a width of 100 m is used at the end of the domain to dissipate the wave energy. Internal wave generation [21,29] is not used, since the reflection from the structure is very limited for very oblique and parallel wave cases. For the oblique wave cases, the reflection cannot be ignored, but the re-reflection from the offshore wave generation boundary has no influence on the overtopping geometrically.…”

Section: Swash Model Settingsmentioning

confidence: 99%

Non-Hydrostatic Modelling of Coastal Flooding in Port Environments

Suzuki

Altomare

Willems

et al. 2023

JMSE

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Understanding key flooding processes such as wave overtopping and overflow (i.e., water flows over a structure when the crest level of the structure is lower than the water level in front) is crucial for coastal management and coastal safety assessment. In port and harbour environments, waves are not only perpendicular to the coastal structure but also very oblique, with wavefronts almost perpendicular to the main infrastructures in the harbour docks. Propagation and wave–structure interaction of such perpendicular and (very) oblique waves need to be appropriately modelled to estimate wave overtopping properly. Overflow can also be critical for estimating flooding behind any coastal defence. In this study, such oblique and parallel waves (i.e., main wave direction is parallel to the structures) are modelled in a non-hydrostatic wave model and validated with physical model tests in the literature. On top, overflow is also modelled and validated using an existing empirical formula. The model gives convincing behaviours on the wave overtopping and overflow.

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“…The dimensions of the numerical domain were chosen to minimise the influence of side-wall reflections. For the long-crested diffraction and response simulations, the model domain spanned 700 m × 416 m. Waves were generated at the western boundary using a source function (Vasarmidis et al, 2019(Vasarmidis et al, , 2020. To minimise the influence of re-reflections, sponge layers were positioned along all boundaries of the domain (see Fig.…”

Section: Moored Floating Cylinder In Open Watermentioning

confidence: 99%

Non-hydrostatic modelling of the wave-induced response of moored floating structures

Rijnsdorp,

Wolgamot,

Zijlema

2022

Preprint

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Predictions of the wave-induced response of floating structures that are moored in a harbour or coastal waters require an accurate description of the (nonlinear) evolution of waves over variable bottom topography, the interactions of the waves with the structure, and the dynamics of the mooring system. In this paper, we present a new advanced numerical model to simulate the wave-induced response of a floating structure that is moored in an arbitrary nearshore region. The model is based on the non-hydrostatic approach, and implemented in the open-source model SWASH, which provides an efficient numerical framework to simulate the nonlinear wave evolution over variable bottom topographies. The model is extended with a solution to the rigid body equations (governing the motions of the floating structure) that is tightly coupled to the hydrodynamic equations (governing the water motion). The model was validated for two test cases that consider different floating structures of increasing geometrical complexity: a cylindrical geometry that is representative of a wave-energy-converter, and a vessel with a more complex shaped hull. A range of wave conditions were considered, varying from monochromatic to short-crested sea states. Model predictions of the excitation forces, added mass, radiation damping, and the wave-induced response agreed well with benchmark solutions to the potential flow equations. Besides the response to the primary wave (sea-swell) components, the model was also able to capture the second-order difference-frequency forcing and response of the moored vessel. Importantly, the model captured the wave-induced response with a relatively coarse vertical resolution, allowing for applications at the scale of a realistic harbour or coastal region. The proposed model thereby provides a new tool to seamlessly simulate the nonlinear evolution of waves over complex bottom topography and the wave-induced response of a floating structure that is moored in coastal waters.

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On the accuracy of internal wave generation method in a non-hydrostatic wave model to generate and absorb dispersive and directional waves

Cited by 6 publications

References 48 publications

A Hybrid Parallel Numerical Model for Wave-Induced Free-Surface Flow

A Hybrid Parallel Numerical Model for Wave-Induced Free-Surface Flow

Non-Hydrostatic Modelling of Coastal Flooding in Port Environments

Non-hydrostatic modelling of the wave-induced response of moored floating structures

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