Shape Optimisation of Model Scale Geotextile Sand Containers (GSC) Regarding Sinking Behaviour: First Results of Physical Model Tests

2016 ◽  
Author(s):  
Désirée Plenker ◽  
Evelyn Heins ◽  
Jürgen Grabe
Keyword(s):  
Wind Energy ◽  
Physical Model ◽  
Model Tests ◽  
Offshore Wind ◽  
Structure Stability ◽  
Shape Optimisation ◽  
Offshore Wind Energy ◽  
Local Flow ◽  
Physical Model Tests ◽  
Scour Protection

Energy transition towards sustainable power generation affects the offshore wind energy sector greatly. Due to extensive research work and technological developments, the number of foundation types for offshore wind energy plants has increased significantly. Independent of foundation type, each structure influences the ecological and hydrodynamic regime surrounding the structure. As a consequence, local flow turbulences may cause scours at the seabed and can lead to a reduction of structure stability. Geotextile sand containers (GSC) are an approved method for scour protection. During installation of scour protection systems, the sinking behaviour of GSC is affected by translational and rotational movement, which impedes an accurate positioning of GSC. Physical model tests have been conducted to analyse the influence of container shape and material properties of GSC. This paper presents the results of these model tests.

Numerical Modelling of Wave Run-Up on a Wind Turbine Foundation

2008 ◽  
Author(s):  
Anders Wedel Nielsen ◽  
Simon Brandi Mortensen ◽  
Vagner Jacobsen ◽  
Erik Damgaard Christensen
Keyword(s):  
Physical Model ◽  
Three Dimensional ◽  
Model Tests ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Physical Model Tests ◽  
Run Up ◽  
3D Effect ◽  
3D Waves ◽  
Horizontal Bottom

This paper presents the results of a CFD model of the wave run-up on a monopile. The monopile is widely used as the foundation unit for offshore wind turbines. The aim for the calculations is to make a detailed investigation of the effect of three-dimensional (3D) waves on the run-up and to determine the maximum wave run-up. The CFD results are compared with the results of physical model tests conducted under the same conditions. The model tests were conducted under idealized conditions: The tests were carried out on a horizontal bottom using phase and directional focused waves to obtain a 3D effect and at the same time being able to control the breaking. The key objective of this part of the numerical analysis is to develop a model capable of reproducing the results of the physical model tests.

scholarly journals Preliminary Design for Wave Run-Up in Offshore Wind Farms: Comparison between Theoretical Models and Physical Model Tests

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 492
Author(s):  
Jorge Luengo Frades ◽  
Vicente Negro ◽  
Javier García Barba ◽  
Mario Martín-Antón ◽  
José López-Gutiérrez ◽  
...  
Keyword(s):  
Physical Model ◽  
Theoretical Models ◽  
Model Tests ◽  
Offshore Wind ◽  
Intermediate Water ◽  
Preliminary Design ◽  
Nonlinear Phenomenon ◽  
Physical Model Tests ◽  
Highly Nonlinear ◽  
Run Up

Estimation of wave run-up has been of increasing concern for offshore wind structures and a critical aspect for designers. The highly nonlinear phenomenon makes the study difficult. That is the reason for the very few design rules and experimental data available to estimate it. Actual wave run-up is greater than commonly predicted. The goal of this research is to benchmark the theoretical formulations with the results of the physical model tests performed by Deltares in the field of crest elevation, run-up, forces and pressures. The laboratory reproduced in a wave tank (75 m length; 8.7 m width; 1 m depth; and a 1:60 scale, with Froude similarity) an offshore power converter platform located at intermediate water depths (25–43.80 m) in the Southern North Sea, designed by the Norwegian company Aibel. The purpose of this research is to offer a preliminary design guide for wave run–up using theoretical expressions both for cylinders and gravity based structures (GBS), leaning on the cited laboratory tests to validate the results obtained by such theoretical models.

A National Offshore Wind Strategy. Creating an Offshore Wind Energy Industry in the United States

2011 ◽  
Author(s):  
Jacques Beaudry-Losique ◽  
Ted Boling ◽  
Jocelyn Brown-Saracino ◽  
Patrick Gilman ◽  
Michael Hahn ◽  
...  
Keyword(s):  
United States ◽  
Wind Energy ◽  
The United States ◽  
Offshore Wind ◽  
Energy Industry ◽  
Offshore Wind Energy
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