scholarly journals EXPERIMENTAL INVESTIGATION OP SHOCK PRESSURES AGAINST BREAKWATERS

1968 ◽  
Vol 1 (11) ◽  
pp. 62 ◽  
Author(s):  
Gustaf Richert
Keyword(s):  
Experimental Investigation ◽  
Wave Front ◽  
Water Depth ◽  
Test Procedure ◽  
Breaking Waves ◽  
Pressure Variation ◽  
Shock Pressure ◽  
Compression And Expansion ◽  
Air Cushion ◽  
Special Respect

This paper describes an experimental investigation of shock pressures against breakwaters caused by "breaking waves. The study only considers shocks of a compressive type, which occur if the wave front is formed in such a way that an air cushion is entrapped between the wave and the wall. In this case the compression and expansion of the air cushion plays an important role m the pressure variation. Only waves preceded by non-breaking waves were used. For different combinations of bottom geometry and water depth the occurrence of shock pressures of different magnitudes was studied varying the wave height and the wave period. For some interesting combinations of bottom geometry and wave dimensions a series of tests were made to investigate the distribution over the wall of shock pressure and of shock impulse. The results, presented m diagrams and tables, have been commented on and analysed with special respect to the chosen test procedure.

An Investigation of Cavitation and Suction Vortices Behavior in Pump Sump

2011 ◽  
Author(s):  
Won-Tae Kang ◽  
Ki Han Yu ◽  
Seung Yeob Lee ◽  
Byeong Rog Shin
Keyword(s):  
Experimental Investigation ◽  
Numerical Analysis ◽  
Test Procedure ◽  
Three Dimensional ◽  
Water Levels ◽  
National Standard ◽  
Piping System ◽  
Test Model ◽  
Grid Systems ◽  
Volume Method

A numerical and an experimental investigation on a suction vortices including cavitation, free vortices and subsurface vortices behavior in the model sump system with multi-intakes is performed at several flow rates and water levels. A test model sump and piping system were designed based on Froude similitude for the prototype of the recommended structure layout by HI-9.8 American National Standard for Pump Intake Design of the Hydraulic Institute. An experiment is performed according to the sump model test procedure of Hyosung Goodsprings, Inc. A numerical analysis of three dimensional multiphase flows through the model sump is performed by using the finite volume method of the CFX code with multi-block structured grid systems. A k-ω Shear Stress Transport turbulence model and the Rayleigh-Plesset cavitation model are used for solving turbulence cavitating flow. Several types of free surface and submerged vortex which occurs with each different water level are identified through the experimental investigation. From the numerical analysis, the vortices are reproduced and their formation, growing, shedding and detailed vortex structures are investigated. To reduce abnormal vortices, an anti-vortex device is considered and its effect is investigated and discussed.

An experimental investigation of the spectral composition of radiation behind the shock-wave front in a CO2-N2-Ar mixture

2006 ◽  
Vol 44 (2) ◽  
pp. 302-305
Author(s):  
E. M. Anokhin ◽  
T. Yu. Ivanova ◽  
N. N. Kudryavtsev ◽  
S. V. Pancheshnyi ◽  
A. Yu. Starikovskii ◽  
...  
Keyword(s):  
Shock Wave ◽  
Experimental Investigation ◽  
Wave Front ◽  
Shock Wave Front ◽  
Spectral Composition

scholarly journals FULL-SCALE WAVE ATTACK OF UNIFORMLY SLOPING SEA DYKES

1988 ◽  
Vol 1 (21) ◽  
pp. 161 ◽  
Author(s):  
Alfred Fuhrboter ◽  
Uwe Sparboom
Keyword(s):  
Concrete Block ◽  
Breaking Waves ◽  
Shock Pressure ◽  
Full Scale ◽  
Federal Republic Of Germany ◽  
Large Wave ◽  
Wave Channel ◽  
Initial Block ◽  
New Research ◽  
Geotextile Filter

Shock pressure phenomena due to breaking waves acting on sloping faces of sea dykes are focussed in this paper. The probability approach is pointed out and maximum shock pressure estimations are given for smooth and impermeable dyke slopes 1:4 and 1:6. An extension of the results to steeper and flatter slopes is proposed. Results of full-scale stability tests on concrete block slope revetments are also reported in this paper. For various structural solutions with granular and geotextile filter layers stability numbers are recommended. Initial block lifting is explained physically by pressure measurements. The full-scale experiments were carried out in the new research facility LARGE WAVE CHANNEL of the universities in Hannover and Braunschweig (Federal Republic of Germany).

scholarly journals RANDOM BREAKING WAVES HORIZONTAL SEABED

1986 ◽  
Vol 1 (20) ◽  
pp. 68 ◽  
Author(s):  
Hans Peter Riedel ◽  
Anthony Paul Byrne
Keyword(s):  
Wave Height ◽  
Water Depth ◽  
Breaking Waves ◽  
Random Wave ◽  
Random Waves ◽  
Flume Experiments ◽  
Depth Ratio ◽  
Wave Trains ◽  
Monochromatic Waves

According to wave theories the depth limited wave height over a horizontal seabed has a wave height to water depth ratio (H/d) of about 0.8. Flume experiments with monochromatic waves over a horizontal seabed have failed to produce H/d ratios greater than 0.55. However designers still tend to use H/d 0.8 for their design waves. Experiments have been carried out using random wave trains in the flume over a horizontal seabed. These experiments have shown that the limiting H/d ratio of 0.55 applies equally well to random waves.

scholarly journals An Experimental Investigation of the Trim Effect on the Behaviour of a Containership in Shallow Water

2019 ◽  
Author(s):  
Khaled Elsherbiny ◽  
Tahsin Tezdogan ◽  
Mohamed Kotb ◽  
Atilla Incecik ◽  
Sandy Day
Keyword(s):  
Experimental Investigation ◽  
Water Depth ◽  
Experimental Work ◽  
Water Resistance ◽  
Suez Canal ◽  
Shallow Waters ◽  
Container Ship ◽  
Ship Model ◽  
New Suez Canal ◽  
The University

Abstract A new division of the Suez Canal in Egypt, termed the New Suez Canal, was opened for international navigation in August 2015. It is therefore important to ensure the safety of ships navigating this new section of the canal. Measures to avoid grounding and/or drifting to the canal banks are necessary. Additionally, accurate prediction data for ship squat and under keel clearance is crucial. This paper presents the results of experimental work carried out at the Kelvin Hydrodynamic Laboratory at the University of Strathclyde, Glasgow, to study the effect of trim on containership sailing characteristics in shallow waters using Kriso Container Ship (KCS) model. A series of model tests were conducted to measure the resistance, sinkage variations with speed, water depth and loading conditions under different trimming angles at 1:75 scale. The objective of this work is to examine the range of ship trim for safe and efficient sailing in restricted water in both depth and width. The study also aimed to provide data to be used in validating numerical computations to be carried on the same type of vessel to detect the best trim angle for ships during sailing in restricted waters to reduce resistance and therefore fuel consumption. For depth Froude numbers higher than 0.4, the results show that the ship model sinkage is less for aft trim than for level trim or forward trim. Concurrently, it can be observed that there is less water resistance for aft trim than for forward trim, albeit level trim shows the least resistance. The test was conducted for one value of model draft which was 0.144 m. Side bank effect were also examined.

Shock Pressure of Breaking Waves (I)

1966 ◽  
Vol 9 (1) ◽  
pp. 83-96 ◽  
Author(s):  
Hisashi Mitsuyasu
Keyword(s):  
Breaking Waves ◽  
Shock Pressure
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