A new 3D parallel SPH scheme for free surface flows

http://oa.upm.es/25973/1/INVE_MEM_2013_160560.pdf

Experimental investigation of dynamic pressure loads during dam break

Wave energy potential in Galicia (NW Spain)

An experimental study of a floating breakwater with asymmetric pneumatic chambers for wave energy extraction

Optimisation of turbine-induced damping for an OWC wave energy converter using a RANS–VOF numerical model

An oscillating water column device enables the conversion of wave energy into electrical energy via wave interaction with a semi-submerged chamber coupled with a turbine for power take off. This present work concentrates on the wave interaction with the semi-submerged chamber, whereby a shore based oscillating water column (OWC) is studied experimentally to examine energy efficiencies for power take-off. The wave environment considered comprises plane progressive waves of steepnesses ranging from kA=0.01 to 0.22 and water depth ratios varying from kh=0.30 to 3.72, where k, A, and h denote the wave number, wave amplitude, and water depth, respectively. The key feature of this experimental campaign is a focus on the influence of front wall geometry on the OWC’s performance. More specifically, this focus includes: front wall draught, thickness, and aperture shape of the submerged front wall. We make use of a two-dimensional inviscid theory for an OWC for comparative purposes and to explain trends noted in the experimental measurements. The work undertaken here has revealed a broad banded efficiency centered about the natural frequency of the OWC. The magnitude and shape of the efficiency curves are influenced by the geometry of the front wall. Typical peak magnitude resonant efficiencies are in the order of 70%.

An Investigation Into the Hydrodynamic Efficiency of an Oscillating Water Column

The impact flow on a vertical wall resulting from a dam break problem is simulated using a Navier-Stokes (NS) solver. The NS solver uses an Eulerian finite volume method (FVM) along with a volume of fluid (VOF) scheme for phase interface capturing. The purpose of this study is to assess the accuracy of the solver for problems in the category of wave impacts. Previous experiments and other numerical solution techniques are compared with the solver’s results. Different aspects of the flow such as free-surface elevation before and after the initial impact have been studied in depth. The pressure peak due to water impact on the vertical wall has also been analyzed. Water viscosity and air compressibility effects have been assessed. The significance of the time step and grid resolution are also discussed. Results show favorable agreement with experiments before water impact on the wall. However, both impact pressure and freesurface elevations after the impact depart from the experiments significantly. Hence the code is assessed to be good only for qualitative studies.

/pdf/simulation-of-the-dam-break-problem-and-impact-flows-using-a-3vke8evfau.pdf

Michael Morris-Thomas

Papers

An Investigation Into the Hydrodynamic Efficiency of an Oscillating Water Column

Simulation of the dam break problem and impact flows using a Navier-Stokes solver

The run-up on a cylinder in progressive surface gravity waves: harmonic components

Experiments on the stability and drag of a flexible sheet under in-plane tension in uniform flow

Wave-induced motions of an air cushion structure in shallow water