The motion of a freely floating cylinder in the presence of a wall and the approximation of resonances

McIver, P.; Porter, Robert

doi:10.1017/jfm.2016.201

Cited by 15 publications

(8 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, a completely reflecting boundary of infinite extent was assumed, which although leads to positive in terms of power absorption effects [14], it does not represent adequately the real physical problem. Finally, two-dimensional approximations have been developed in [15] for describing the resonant behavior of a single, free-floating, semi-immersed cylinder in the presence of a vertical rigid wall.…”

Section: Introductionmentioning

confidence: 99%

Performance of an Array of Oblate Spheroidal Heaving Wave Energy Converters in Front of a Wall

Loukogeorgaki

Boufidi

Chatjigeorgiou

2020

Water

View full text Add to dashboard Cite

In this paper, we investigate the performance of a linear array of five semi-immersed, oblate spheroidal heaving Wave Energy Converters (WECs) in front of a bottom-mounted, finite-length, vertical wall under perpendicular to the wall regular waves. The diffraction and radiation problems are solved in the frequency domain by utilizing the conventional boundary integral equation method. Initially, to demonstrate the enhanced absorption ability of this array, we compare results with the ones corresponding to arrays of cylindrical and hemisphere-shaped WECs. Next, we investigate the effect of the array’s distance from the wall and of the length of the wall on the physical quantities describing the array’s performance. The results illustrate that the array’s placement at successively larger distances from the wall, up to three times the WECs’ radius, induces hydrodynamic interactions that improve the array’s hydrodynamic behavior, and thus its power absorption ability. An increase in the length of the wall does not lead to any significant power absorption improvement. Compared to the isolated array, the presence of the wall affects positively the array’s power absorption ability at specific frequency ranges, depending mainly on the array’s distance from the wall. Finally, characteristic diffracted wave field patterns are presented to interpret physically the occurrence of the local minima of the heave exciting forces.

show abstract

Section: Introductionmentioning

confidence: 99%

Performance of an Array of Oblate Spheroidal Heaving Wave Energy Converters in Front of a Wall

Loukogeorgaki

Boufidi

Chatjigeorgiou

2020

Water

View full text Add to dashboard Cite

show abstract

“…Despite the effect of wave reflections, they can be beneficial for wave energy converters, by increasing their motions, and as a result, their power absorption, which may result in stability and structural issues in the floating structures that are placed nearshore. Indicative theoretical and experimental studies concerning the effect of a vertical wall on the hydrodynamic characteristics of an array of five floating cylindrical bodies are studied in References [33,34], whereas, in Reference [35], the resonances of a freely floating half immersed cylinder in front of a vertical rigid breakwater have been investigated. Additionally, in References [36][37][38][39][40][41], the corresponding wave diffraction problem, as well as the motionand pressure-radiation problems of a single truncated cylinder and of an oscillating water column wave energy converter (WEC), placed in front of a vertical wall, was examined.…”

Section: Body-breakwater Simulation Methodsmentioning

confidence: 99%

Mean Drift Forces on Vertical Cylindrical Bodies Placed in Front of a Breakwater

Konispoliatis

Mavrakos

2020

Fluids

View full text Add to dashboard Cite

This paper presents a numerical and experimental investigation of the second-order steady horizontal and vertical drift forces acting on cylindrical bodies in regular waves. The examined bodies are either kept restrained in front of a vertical breakwater or are considered free- floating when alone in the wave field. Two principally different approaches for mean drift forces determination are described: the momentum conservation principle and the direct integration of all pressure contributions upon the instantaneous wetted surface of the bodies, whereas, for the solution of the associated diffraction and motion radiation problems, analytical and panel methodologies are applied. The hydrodynamic interaction phenomenon between the bodies and the adjacent breakwater are taken into account by using the method of images. Theoretical and numerical results, concerning the horizontal and the vertical drift forces, are presented and compared with each other. Furthermore, additional comparisons are made with experimental data obtained during an experimental campaign at French research institute for exploitation of the sea (IFREMER), in France.

show abstract

“…Thus, both r and p 3 are functions of the real frequency parameter κ = Ka and, for the present purposes, each may be extended analytically into a suitable complex neighbourhood of the real axis (see [14, section 4]). Results will be obtained using the standard wide-spacing approximation ( = 0); the term in 2 is included above to shed light on the magnitude of the first neglected term and will not be be included explicitly from now on (for the case of a half-immersed circular cylinder next to a wall, the effects of this term are discussed in detail in [22]). The overall aim is to obtain approximations to the locations of resonances using high-frequency approximations to the hydrodynamic coefficients that are valid for Ka 1.…”

Section: Locations Of the Complex Resonancesmentioning

confidence: 99%

The added mass for two-dimensional floating structures

McIver

2016

Wave Motion

Self Cite

View full text Add to dashboard Cite

The motion of a freely floating cylinder in the presence of a wall and the approximation of resonances

Cited by 15 publications

References 33 publications

Performance of an Array of Oblate Spheroidal Heaving Wave Energy Converters in Front of a Wall

Performance of an Array of Oblate Spheroidal Heaving Wave Energy Converters in Front of a Wall

Mean Drift Forces on Vertical Cylindrical Bodies Placed in Front of a Breakwater

The added mass for two-dimensional floating structures

Contact Info

Product

Resources

About