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P. T. Geiger

Bio: P. T. Geiger is an academic researcher. The author has contributed to research in topics: Breakwater & Potential flow. The author has an hindex of 2, co-authored 2 publications receiving 60 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the behavior of a flexible, floating breakwater consisting of a moored, compliant, beam-like structure anchored to the seabed and possessing a small buoyancy chamber at the tip was investigated.
Abstract: This study investigated the behavior of a flexible, floating breakwater consisting of a moored, compliant, beam-like structure anchored to the seabed and possessing a small buoyancy chamber at the tip. The fluid domain is treated utilizing the boundary integral equation method, modifications have been made to the basic formulation to account for the zero thickness of the idealized structure. The dynamic behavior of the breakwater is described through an appropriate Green's function and the coupled fluid-structure system is then solved numerically. Example results have been presented which illlustrate the effects of the various waves and structural parameters on the efficiency of the breakwater as a barrier to wave action. It was found that for typical wave conditions relatively stiff structures are required in order to obtain high wave reflection coefficients.

50 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the dynamics of a submerged compliant breakwater consisting of a flexible, beam-like structure anchored to the seabed and kept under tension by a small buoyancy chamber at the tip.
Abstract: A numerical technique is utilised to investigate the dynamics of a submerged compliant breakwater consisting of a flexible, beamlike structure anchored to the seabed and kept under tension by a small buoyancy chamber at the tip. The fluid motion is idealised as linearised, two-dimensional potential flow and the equation of motion of the breakwater is taken to be that of a one-dimensional beam of uniform flexural rigidity and mass per unit length subjected to a constant axial force. The boundary integral equation method is applied to the field domain, modifications are made to the basic formulation to account for the zero thickness of the idealised structure and the singularity in the fluid velocity which occurs at the breakwater tip. The dynamic behaviour of the breakwater is described through an appropriate Green function. Numerical results are presented which illustrate the global influence of the tip singularity on the solution and the effects of the various wave and structural parameters on the efficiency of the breakwater as a barrier to wave action. Small-scale physical model tests were also carried out to validate the foregoing theory. In general, the agreement between experimental and numerical results was reasonable, but with considerable scatter.

12 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the hydrodynamic interaction of regular and irregular waves with floating breakwaters (FBs) in shallow and intermediate waters is examined experimentally in a large-scale facility.
Abstract: In the present study the hydrodynamic interaction of regular and irregular waves with floating breakwaters (FBs) in shallow and intermediate waters is examined experimentally in a large-scale facility. The experiments were conducted in the CIEM flume of the Catalonia University of Technology, Barcelona. The influence of incident wave characteristics and certain geometric characteristics, such as the width and the draught of the structure, on its efficiency is examined. Four different FBs configurations are examined: (a) single fixed FB, (b) heave motion FB, (c) single fixed FB with attached front plate (impermeable and permeable) and (d) double fixed FB. Results related to transmission, reflection, and energy dissipation of the incident (regular and irregular) waves on the structure are presented. For the single fixed FB, the efficiency of the structure is proportional to the width/wavelength and draught/water depth ratios. The single fixed FB operates in a highly reflective manner. On the other hand, the...

103 citations

01 Jan 2005
TL;DR: In this paper, the authors examined the hydrodynamic interaction of regular and irregular waves with floating breakwaters in shallow and intermediate waters in a large-scale facility, and the results related to transmission, reflection and energy dissipation of the incident (regular and irregular) waves on the structure were presented.
Abstract: In the present study the hydrodynamic interaction of regular and irregular waves with floating breakwaters (FBs) in shallow and intermediate waters is examined experimentally in a large-scale facility. The experiments were conducted in the CIEM flume of the Catalonia University of Technology, Barcelona. The influence of incident wave characteristics and certain geometric characteristics, such as the width and the draught of the structure, on its efficiency is examined. Four different FBs configurations are examined: (a) single fixed FB, (b) heave motion FB, (c) single fixed FB with attached front plate (impermeable and permeable) and (d) double fixed FB. Results related to transmission, reflection, and energy dissipation of the incident (regular and irregular) waves on the structure are presented. For the single fixed FB, the efficiency of the structure is proportional to the width/wavelength and draught/water depth ratios. The single fixed FB operates in a highly reflective manner. On the other hand, the heave motion FB operates in a dissipative manner with much lower reflection. The attached plate in the front part of the FB significantly enhances the efficiency of the structure. No significant differences are observed between the impermeable and the permeable plate cases. Generally, the most efficient configuration has been the double fixed FB. However, with regard to cost-effectiveness, the configuration of the FB with the attached plate should be considered the most efficient for design purposes. RESUME Dans la presente etude l’interaction hydrodynamique des vagues regulieres et irregulieres avec des brise-lames flottants (FBs) en eaux peu profondes

91 citations

Journal ArticleDOI
TL;DR: In this article, the reflection and transmission of small-amplitude waves by a flexible, porous, and thin beam-like breakwater held fixed in the seabed is studied.
Abstract: This is a theoretical study of the reflection and transmission of small‐amplitude waves by a flexible, porous, and thin beam‐like breakwater held fixed in the seabed. The fluid motion is idealized as a linearized, two‐dimensional potential flow and the breakwater is idealized as a one‐dimensional beam of uniform flexural rigidity and uniform mass per unit length. The velocity potentials of the wave motion are coupled with the equation of motion of the breakwater. Analytical solutions in closed forms are obtained for the reflected and transmitted velocity potentials together with the displacement of the breakwater. The free‐surface elevation, hydrodynamic force acting on the breakwater, and the overturning moment are determined. The dynamic response of the breakwater in terms of bending moment and shear force are also evaluated. It is found in general that hydrodynamic force increases as structural rigidity increases. The magnitude of the force is reduced dramatically for a stiffer porous breakwater. It is...

76 citations

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the scattering of oblique surface gravity waves due to the presence of multiple bottom-standing flexible porous barriers in finite water depth based on the linearized theory of water waves.

57 citations

Journal ArticleDOI
TL;DR: In this paper, the interaction of water waves with a tensioned, unstretchable, vertical flexible membrane extended to the seabed is solved in the context of two-dimensional linear wave theory.
Abstract: The interaction of water waves with a tensioned, unstretchable, vertical flexible membrane extended to the seabed is solved in the context of two-dimensional linear wave theory. First, analytic solutions are obtained based on the eigenfunction expansion of the velocity potential in two fluid domains and a continuous tensioned-string dynamic model. In contrast to the rigid-body hydrodynamics, the velocity potentials and membrane equation of motions are obtained simultaneously, since the membrane boundary condition is not known in advance. Second, a boundary element program based on a discrete membrane dynamic model and simple source distribution method is developed. Two different numerical methods, the iteration and whole matrix methods, are developed and both agree well with analytic solutions. Using those computer programs, the performance of a flexible-membrane wave barrier with varying initial tension, length, and mass density is investigated. It is found that almost complete reflection of incident wav...

54 citations