The Use of CFD in the Analysis of Wave Loadings Acting on Seawave Slot-Cone Generators

Buccino, Mariano; Dentale, Fabio; Salerno, Daniela; Contestabile, Pasquale; Calabrese, Mario

doi:10.3390/su8121255

Cited by 16 publications

(8 citation statements)

References 25 publications

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“…Several CFD models of different wave power concepts have been developed and verified in recent years [2,3]. In [4], wave load of breaking waves on an overtopping device was studied in a physical wave flume, and in [5], the results were reproduced with good agreement using a RANS-VOF model. In [6,7] a point-absorbing WEC with linear-elastic mooring, moving in six degrees of freedom, was modeled showing good agreement with wave tank experiments, and in reference [8], another point-absorber device was modeled both fixed and freely floating.…”

Section: Introductionmentioning

confidence: 99%

Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves

Sjökvist

Göteman

2017

Energies

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Abstract:The focus of this paper is the survivability of wave energy converters (WECs) in extreme waves and tsunamis, using realistic WEC parameters. The impact of a generator damping factor has been studied, and the peak forces plotted as a function of wave height. The paper shows that an increased damping decreases the force in the endstop hit, which is in agreement with earlier studies. However, when analyzing this in more detail, we can show that friction damping and velocity dependent generator damping affect the performance of the device differently, and that friction can have a latching effect on devices in tsunami waves, leading to higher peak forces. In addition, we study the impact of different line lengths, and find that longer line lengths reduce the endstop forces in extreme regular waves, but on the contrary increase the forces in tsunami waves due to the different fluid velocity fields.

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Section: Introductionmentioning

confidence: 99%

Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves

Sjökvist

Göteman

2017

Energies

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“…Traditionally, engineers design breakwaters to limit overtopping events, guaranteeing the tranquility of harbors. However, in some cases this phenomenon is instead favored and namely for wave energy converters which deploy the overtopping mechanism (Buccino et al, 2015a, 2015b, Contestabile et al, 2016 and in presence of wave attacks of particular severity. In the latter case, wave overtopping may reduce the magnitude of the wave action and, for vertical breakwaters, lower the probability of impulsive loadings (Goda 1995, Allsop et al, 1997, Calabrese and Buccino, 2000.…”

Section: Introductionmentioning

confidence: 99%

“…Buccino et al, 2016;Vicinanza et al, 2015, Dentale et al, 2014a, 8 sea-states were simulated, made up on 30 waves on average. The storms were driven by a very narrow banded spectrum, allowing to keep the wave period almost constant in each test.…”

Section: Introductionmentioning

confidence: 99%

A CFD Study on the Structural Response of a Sloping Top Caisson

Daliri

Dentale

Salerno

et al. 2017

Int. Conf. Coastal. Eng.

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The paper discusses preliminary results of a CFD study on the structural response of a Sloping Top Breakwater subject to wave overtopping. The analysis showed that the transmitted wave field act to increase both the landward and the seaward forces and that the conventional design methods may be not adequate to guarantee an appropriate degree of safety to the structure. The study also confirmed the previous finding by Walkden et al. (2001), which noticed the existence of strong impulsive loadings on the inner face of the wall, due to violent overtopping events.

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“…Vicinanza et al and Buccino et al have made an interesting comparison between the CFD and laboratory experiments. [27,28] Recently, the integration of heaving-buoy WECs and floating breakwaters has become a topic of great research interest (Figure 1). Analytical studies on the hydrodynamic performance of the integrated WEC-breakwater were conducted and it was found that the peak efficiency can be achieved at 80% with a proper power take-off (PTO) [29,30].…”

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confidence: 99%

Hydrodynamic Performance of Rectangular Heaving Buoys for an Integrated Floating Breakwater

Zhang

Qing-jun

Liu

2019

JMSE

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Recently, the integrated development of wave energy converters and breakwaters has become popular, moving from traditional passive wave absorption to active energy capture. In this study, rectangular heaving buoys are considered as floating breakwater modules to absorb wave energy. A numerical wave tank is established based on Reynolds Averaged Navier-Stokes equation and User-Define-Function in ANSYS-Fluent commercial software. The numerical results show that incident wave conditions and submerged depth have significant effects on the heaving performance and wave energy absorption of a rectangular buoy. Flow structures around the buoy are shown to exhibit flow separations and vortex shedding, which can provide more information on buoy optimization. Power take-off (PTO) reaction forces are assumed to be a linear function of the translation velocities of the buoy. Numerical results demonstrate that a suitable PTO module can improve the wave power absorption by up to 34.2% for certain buoy and wave conditions, which is valuable for further investigations. reliable data and valuable information for the designer. A buoy with heaving and pitching motion was tested and the dynamic properties were used for numerical model validation [7,8]. Experimental measurements of the interactions of a taut moored floating body were conducted under extreme wave conditions, with the aim of representing the wave energy converter in survivability mode [9].Falnes analyzed the heaving motion of WECs using potential flow theory with boundary element methods [10]. Heikkinen considered the effects of phase shift, cylinder radius, wave height, and period on the efficiency of a submerged pitch-type cylinder wave energy converter [11]. Several studies gave further insight into the influences of damping or PTO components on the hydrodynamic characteristics of point absorber wave energy converters, and proposed several effective control strategies [12][13][14][15][16][17]. Evans et al. and Davis et al. considered the limits of theory assumptions; for example, assuming the flow to be linear and irrotational and neglecting viscosity effects might be a reason for considerable discrepancies with a practical system [18,19].With the rapid development of the computer and computational fluid dynamics (CFD) techniques, to date, several software applications have been developed based on linear wave theory and radiation or diffraction models, such as ANSYS-Aqwa [20], WAMIT [21], and Hydrostar [22]. However, computational fluid dynamic (CFD) methods based on the Navier-Stokes (NS) equation model were found to be a promising approach for non-linear hydrodynamic characteristics between waves and floating bodies, viscous flow separations, and even possible wave overtopping and breaking [23]. The NS equation model often recruits the moving boundaries between solids and fluids and deforming meshes. It should be mentioned that the CFD techniques are growing popular as research tools for maritime structures, and a good deal of literature exists with respect to wave...

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The Use of CFD in the Analysis of Wave Loadings Acting on Seawave Slot-Cone Generators

Cited by 16 publications

References 25 publications

Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves

Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves

A CFD Study on the Structural Response of a Sloping Top Caisson

Hydrodynamic Performance of Rectangular Heaving Buoys for an Integrated Floating Breakwater

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