Wave-flume tests of a model-scaled OWC chamber-turbine system under irregular wave conditions

2020 ◽  
Vol 99 ◽  
pp. 102141
Author(s):  
Zhen Liu ◽  
Chuanli Xu ◽  
Hongda Shi ◽  
Na Qu
Keyword(s):  
Irregular Wave ◽  
Wave Flume ◽  
Flume Tests ◽  
Wave Conditions

EXPERIMENTAL STUDY OF IMMERSED PLATES USED AS BREAKWATERS

1988 ◽  
Vol 1 (21) ◽  
pp. 168
Author(s):  
Alain Drouin ◽  
Yvon Ouellet
Keyword(s):  
Experimental Study ◽  
Volume Of Fluid ◽  
Irregular Wave ◽  
Wave Flume ◽  
Water Wall ◽  
Harmonic Frequencies ◽  
Hydraulic Conditions ◽  
Wave Trains ◽  
Wave Conditions

Under certain wave conditions, an immersed plate which is free to move horizontally produces what has already been called the oscillating water wall phenomenon. When this happens, the plate and the volume of fluid located under the plate move back and forth and then behave as a wave reflector. This type of breakwater was studied in a wave flume with monochromatic and irregular wave trains. Tests have provided a better understanding of the influence of certain parameters that define a plate and the hydraulic conditions under which the plate is used. Results show some interesting efficiencies and also transfert of the energy to harmonic frequencies.

Experimental study for characteristics of slamming loads on bow of a ship-type FPSO under breaking and irregular wave conditions

2021 ◽  
Vol 224 ◽  
pp. 108738
Author(s):  
Yoon-Jin Ha ◽  
Kyong-Hwan Kim ◽  
Bo Woo Nam ◽  
Sa Young Hong ◽  
Hyunjoe Kim
Keyword(s):  
Experimental Study ◽  
Irregular Wave ◽  
Wave Conditions

Experimental Wave Flume Tests in ROV-Wave Interaction Effects on the Line Tension for a Work Class ROV in Splash Zone

2021 ◽  
Author(s):  
Michael Binsar Lubis ◽  
Mehrdad Kimiaei
Keyword(s):  
Time History ◽  
Wave Interaction ◽  
Line Tension ◽  
Irregular Waves ◽  
Splash Zone ◽  
Remotely Operated Vehicle ◽  
Wave Flume ◽  
Flume Tests ◽  
Tension Time ◽  
Work Class

Abstract Integrity and stability of Remotely Operated Vehicle (ROV) when passing through the splash zone is one of the main concerns in the design of an ROV-umbilical system. Due to the lightweight nature of ROV in water, the umbilical experiences repetitive rapid transitions between slack and taut as the ROV travels through the splash zone. These rapid transitions induce tension spikes in the umbilical, namely snap forces, that can endanger the launch and recovery of an ROV. Therefore, it is important to ensure that the tension spikes do not exceed the safe working load of the umbilical. In this study, launch and recovery of a deep-water work class ROV are experimentally investigated using a 1:10 scaled ROV model through a series of wave flume tests. Different regular and irregular waves are generated in the flume while the ROV model is hung over the flume in four different positions. The tension time-history in the line is measured and recorded using a load cell at the top-end of the line. A simplified numerical model for launch and recovery of the ROV is developed and the numerical results are compared with the experimental ones. It is shown that the presented simplified model can be accurately used for analysis of launch and recovery of the ROV.

scholarly journals MAGNITUDE OF THE B-FACTOR UNDER WAVE ACTION

1986 ◽  
Vol 1 (20) ◽  
pp. 67
Author(s):  
J. Van de Graaff ◽  
R.C. Steijn
Keyword(s):  
Velocity Distribution ◽  
Water Depth ◽  
Sediment Concentration ◽  
Wave Action ◽  
Practical Applications ◽  
Wave Flume ◽  
Sediment Size ◽  
Flume Tests ◽  
Waves And Currents ◽  
The Moment

The sediment transport due to waves and currents depends on the distribution of sediment concentration and on the distribution of the velocity over the water depth. Our knowledge of both phenomena for practical applications is still rather poor. Some results of wave flume tests concerning the distribution of sediment concentrations due to wave action will be discussed. It turns out that the sediment size of the bottom material has a rather unexpected effect hereupon. With respect to the velocity distribution only some qualitative remarks can be made at the moment.

The Optimization of Blade Pitch Settings of an Air Turbine Using Self-Pitch-Controlled Blades For Wave Power Conversion

2001 ◽  
Vol 123 (4) ◽  
pp. 382-386 ◽  
Author(s):  
T. H. Kim ◽  
T. Setoguchi ◽  
K. Kaneko ◽  
M. Takao
Keyword(s):  
Oscillating Water Column ◽  
Flow Conditions ◽  
Irregular Wave ◽  
Turbine Performance ◽  
Air Chamber ◽  
Air Turbine ◽  
Wave Power Conversion ◽  
Wave Conditions ◽  
Starting Characteristics ◽  
Blade Pitch Angle

This work investigated an air turbine with self-pitch-controlled blades operating in the airflow generated by an oscillating water column (OWC) under irregular wave conditions to determine turbine performance and identify the optimum blade pitch angle setting. Rotor models with fixed blades were tested under steady flow conditions. The running and starting characteristics of the turbine under irregular wave conditions were determined from a computer simulation that modeled both the turbine and the air chamber. The performance of the air turbine was evaluated and the optimum rotor blade limit was found to be about 10°.

Numerical Analysis of the Performance of Perforated Coastal Structures under Irregular Wave Conditions

2015 ◽  
Vol 315 ◽  
pp. 1159-1169
Author(s):  
Insik Chun ◽  
Hak Soo Lim ◽  
Jae Seol Shim ◽  
Kyung Soo Park
Keyword(s):  
Numerical Analysis ◽  
Coastal Structures ◽  
Irregular Wave ◽  
Wave Conditions

Hydrodynamic Performance of a Novel Free Surface Pitching Breakwater

2014 ◽  
Author(s):  
Vengatesan Venugopal ◽  
Stefan Zlatev
Keyword(s):  
Body Shape ◽  
Hydrodynamic Performance ◽  
Irregular Waves ◽  
Scale Model ◽  
Reflected Waves ◽  
Irregular Wave ◽  
Wave Flume ◽  
Floating Breakwater ◽  
Wave Heights ◽  
Transmission Ct

A new concept floating breakwater was developed and tested to evaluate its hydrodynamic performance in this paper. This innovative floating breakwater has a rocking body shape which could also be used as a wave power device. A scale model was tested in a wave flume under regular and irregular wave conditions for various combinations of wave frequencies and wave heights. The breakwater has been tested for three immersion depths of 0.05 m, 0.09 m and 0.13 m from still water level. The measured transmitted and reflected waves were used to evaluate the coefficients of transmission (CT), reflection (CR) and dissipation (CL). The results illustrated that the breakwater model performed at its best when submerged at 0.13m, as this immersion depth produced lower coefficients of transmission (CT), lower reflection coefficients (CR) and higher energy dissipation (CL) coefficients. The comparison between regular and irregular waves produced similar ranges of transmission, reflection and energy coefficients.

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