scholarly journals Hydrodynamic Pressure on Two dimensional Body with Reflective Condition at Sea Bottom during Earthquakes

1996 ◽  
Vol 12 ◽  
pp. 61-66
Author(s):  
Satoshi MORITA ◽  
Takayuki NAKAMURA
Keyword(s):  
Hydrodynamic Pressure ◽  
Two Dimensional ◽  
Sea Bottom

Effects of horizontally two-dimensional bodies on the mass transport near the sea bottom

1977 ◽  
Vol 83 (3) ◽  
pp. 415-431 ◽  
Author(s):  
Jacques Lamoure ◽  
Chiang C. Mei
Keyword(s):  
Boundary Layer ◽  
Mass Transport ◽  
Experimental Evidence ◽  
Coriolis Force ◽  
Gravity Waves ◽  
Harmonic Waves ◽  
Two Dimensional ◽  
Convex Corner ◽  
Horizontal Dimension ◽  
Sea Bottom

Mass transport close to the sea bottom is investigated for simple harmonic waves around a body with a small horizontal dimension. For gravity waves it is shown that the mass transport very near the bottom points towards a convex corner, but near the top of the boundary layer its direction reverses. Possible implications for silting near a pile and a harbour entrance are discussed and some experimental evidence given. For tides, the Coriolis force introduces a spiralling variation within the boundary layer, and possible inferences for coastline modification are drawn.

scholarly journals The Response of a Poroelastic Ice Plate to an External Pressure

2021 ◽  
pp. 87-97
Author(s):  
Kristina N. Zavyalova ◽  
Konstantin A. Shishmarev ◽  
Alexander A. Korobkin
Keyword(s):  
Linear Theory ◽  
Elastic Plate ◽  
External Load ◽  
Oscillation Frequency ◽  
Hydrodynamic Pressure ◽  
Ice Cover ◽  
External Pressure ◽  
Two Dimensional ◽  
Liquid Penetration ◽  
Dimensional Problem

The response of a poroelastic ice cover to an external load is considered. The ice cover is modeled by a thin poroelastic floating plate within the linear theory of hydroelasticity. The porosity parameter is defined as the coefficient of proportionality of the velocity of liquid penetration into the plate and hydrodynamic pressure. The fluid under the plate is inviscid and incompressible. The flow caused by the ice deflection is potential. The external load is modeled by a localized smooth pressure. The two-dimensional problem of waves caused by a periodic external pressure on a floating porous-elastic plate is considered. The profiles of the generated waves are calculated for a given oscillation frequency of the amplitude of the external pressure. It was found that taking porosity into account leads to damping of oscillations in a distance from the external load

Two Dimensional Wavelet Coefficient Statistics for Sea Bottom Classification

2008 ◽  
Vol 123 (5) ◽  
pp. 3748-3748
Author(s):  
Ioannis Koukos ◽  
Theodoros Mavroidis ◽  
Georgios Vardoulias
Keyword(s):  
Wavelet Coefficient ◽  
Two Dimensional ◽  
Sea Bottom ◽  
Bottom Classification

Regular Wave Experiments for Twin Circular Submerged Floating Tunnel Tethered to Sea Bottom

2017 ◽  
Author(s):  
Sang-Ho Oh ◽  
Woo Sun Park
Keyword(s):  
Hydrodynamic Performance ◽  
Hydrodynamic Characteristics ◽  
Two Dimensional ◽  
Wave Loading ◽  
Regular Waves ◽  
Wave Flume ◽  
Sea Bottom ◽  
Physical Experiments ◽  
Tensile Forces ◽  
Submerged Floating Tunnel

Assessment of hydrodynamic performance of submerged floating tunnel (SFT) under wave loading is one of important factor in the design of the structure. In this study, physical experiments were conducted in a two-dimensional wave flume to investigate hydrodynamic characteristics of a twin circular SFT model under the action of regular waves having different heights and periods. Five different configurations of the twin SFT model was tested in the experiment. The experimental results showed that the three-degree motions of the twin SFT and the associated tensile forces on the tension legs greatly vary with the configurations of the model. It was found that the CD0 configurations are most adequate for satisfactorily restricting the horizontal and vertical motions of the SFT model.

scholarly journals Fundamental Study on Elastic Vibration of Sea Bottom under Hydrodynamic Pressure due to Sea Shock

2001 ◽  
Vol 2001 (189) ◽  
pp. 87-92 ◽  
Author(s):  
Masatoshi Bessho ◽  
Hisaaki Maeda ◽  
Koichi Masuda ◽  
Hiroaki Takamura
Keyword(s):  
Hydrodynamic Pressure ◽  
Elastic Vibration ◽  
Fundamental Study ◽  
Sea Bottom

scholarly journals Hydrodynamic pressures on sloping dams during earthquakes. Part 2. Exact theory

1978 ◽  
Vol 87 (2) ◽  
pp. 343-348 ◽  
Author(s):  
Allen T. Chwang
Keyword(s):  
Potential Flow ◽  
Reasonable Agreement ◽  
Hydrodynamic Pressure ◽  
Flow Theory ◽  
Upstream Face ◽  
Momentum Balance ◽  
Two Dimensional ◽  
Exact Theory ◽  
Constant Slope ◽  
Integral Solutions

The equations for the earthquake forces on a rigid dam with an inclined upstream face of constant slope are solved exactly by two-dimensional potential-flow theory. The distribution of the hydrodynamic pressure along the upstream face and the total horizontal, vertical and normal loads on the dam are computed from the integral solutions. The results obtained from the exact theory are compared with those derived from the momentum-balance method and there is reasonable agreement.

Hydrodynamic Load Support of a Slip Wedge

Tribology ◽  
2006 ◽  
Author(s):  
C. W. Wu ◽  
G. J. Ma
Keyword(s):  
Hydrodynamic Pressure ◽  
Wall Slip ◽  
Surface Friction ◽  
Two Dimensional ◽  
Hydrodynamic Load ◽  
Friction Drag ◽  
Slider Bearing ◽  
Small Surface ◽  
Slip Control ◽  
Control Equation

This paper studies the hydrodynamic load support generated by a slip wedge of a slider bearing. The surface slip property is optimized to obtain a maximum hydrodynamic load support. A multi-linearity method was used to approach the slip control equation of two-dimensional (2-D) wall slip. It is found that the hydrodynamic pressure generated in the slip wedge is greater than that of the traditional geometrical convergent-wedge. Even though the geometrical gap is a parallel or divergent sliding gap, the slip wedge still gives rise to a very big hydrodynamic pressure. The optimized slip wedge gives rise to a maximum hydrodynamic load support as large as 2.5 times of what the Classical Reynolds theory predicts for the geometrical convergent-wedge. Wall slip usually gives a small surface friction drag.

Undulating Plate Type Propeller: The Two-Dimensional Ideal Case

1969 ◽  
Vol 13 (03) ◽  
pp. 171-177
Author(s):  
A. G. Szeless
Keyword(s):  
Free Stream ◽  
Numerical Technique ◽  
Hydrodynamic Pressure ◽  
Power Input ◽  
Stream Velocity ◽  
Two Dimensional ◽  
Propulsive Efficiency ◽  
Incompressible Ideal Fluid ◽  
Reduced Frequency ◽  
Plate Type

The motion of a two-dimensional flexible undulating plate in an incompressible ideal fluid flow is investigated. Employing an iterative numerical technique the motion of the plate and the hydrodynamic pressure distribution are found together with the resulting thrust or drag. The power input is calculated from the work of the exciting force per cycle, and the propulsive efficiency is defined in terms of thrust, free-stream velocity, and power input. For a given plate configuration in the frequency ranges studied, the propulsive efficiency is dependent on the reduced frequency only and reaches 50 percent. Plans for the continuation of this investigation are indicated.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

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