Surface Evolution and Wave Loads on a Horizontal Plate in Different Tsunami-like Waves

2020 ◽  
Vol 14 (05) ◽  
pp. 2040001
Author(s):  
Qian Wang ◽  
Yong-Liu Fang ◽  
Hua Liu
Keyword(s):  
Solitary Wave ◽  
Wave Force ◽  
Hydrodynamic Characteristics ◽  
Vertical Force ◽  
Wave Loads ◽  
Horizontal Plate ◽  
Local Pressure ◽  
Surface Evolution ◽  
Undular Bore ◽  
Physical Experiments

Physical experiments are conducted to study the interaction between the tsunami-like waves and the horizontal plate. The surface evolution and wave-induced loads are measured to explore the hydrodynamic characteristics when different waves are employed to simulate the tsunami. The solitary wave, surge wave, and undular bore are generated in laboratory as the simplification of the offshore tsunami wave. The bottom-fixed plate places near the free surface. It is found that the elevated plate attenuates the solitary waves locally, while the submerged plate leads to the wave focus phenomenon. The plate has less influence on the surface variation of the surge wave propagating. Results of loads show the different loading process of each tsunami-like wave. The inertial wave force and the local pressure from the rising surface dominate the inline force and vertical force, respectively. The value of loads induced by the surge wave is less than that of the solitary wave. The undular bore is generated by the superimposition of the solitary wave on the surge wave. The part of the solitary wave plays a local role in the wave force, while the surge part dominates the surface evolution.

Wave Action on Double-Cylinder Structure With Perforated Outer Wall

2003 ◽  
Author(s):  
Yucheng Li ◽  
Lu Sun ◽  
Bin Teng
Keyword(s):  
Numerical Experiments ◽  
Fluid Velocity ◽  
Wave Interaction ◽  
Outer Wall ◽  
Wave Force ◽  
Wave Loads ◽  
Linear Solution ◽  
Perforated Wall ◽  
Physical Experiments ◽  
Run Up

Based on an eigenfunction expansion of velocity potential and a linear model between the pressure difference between two sides of a perforated wall and the fluid velocity inside it, a semi-analytic linear solution has been acquired for wave interaction with a combined cylinder with an solid interior column surrounded by a coaxial exterior column with perforated wall at a section in azimuthal direction. Numerical experiments have been carried out to examine the influences on the wave force and wave run-up on the combined cylinders with perforated wall by the porous coefficient, the size of the perforated section, and the ratio between the radii of the interior and the exterior columns. This paper also presents the comparison between the numerical experiments results and the physical experiments results. It is acceptable of the comparison of these two results. The combined cylinder may reduce both the wave run-up and the wave loads on it through combination of certain parameters.

scholarly journals Three-Dimensional Simulations of Offshore Oil Platform in Square and Diamond Arrangements

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Saliha Nouri ◽  
Zouhair Hafsia ◽  
Salah Mahmoud Boulaaras ◽  
Ali Allahem ◽  
Salem Alkhalaf ◽  
...  
Keyword(s):  
Solitary Wave ◽  
Three Dimensional ◽  
Wave Force ◽  
Circular Cylinders ◽  
Shielding Effect ◽  
Wave Crest ◽  
Wave Flow ◽  
Internal Source ◽  
Flat Bottom ◽  
Surface Evolution

The interaction of the solitary wave with an oil platform composed of four vertical circular cylinders is investigated for two attack angle of the solitary wave β = 0 ° (square arrangement) and β = 45 ° (diamond arrangement). The solitary wave is generated using an internal source line as proposed by Hafsia et al. (2009). This generation method is extended to three-dimensional wave flow and is integrated into the PHOENICS code. The volume of fluid approach is used to capture the free surface evolution. The present model is validated in the case of a solitary wave propagating on a flat bottom for H / h = 0.25 where H is the wave height and h is the water depth. Compared to the analytical solution, the pseudowavelength and the wave crest are well reproduced. For a solitary wave interacting with square and diamond cylinders, the simulated results show that the maximum run-ups are well reproduced. For the diamond arrangements, the diffraction process seems to not affect the maximum run-ups, which approached the isolated cylinder. For the square arrangement, the shielding effect leads to a maximum wave force more pronounced for the upstream cylinder array.

scholarly journals An Experimental Investigation of Wave Forces on a Submerged Horizontal Plate over a Simple Slope

2020 ◽  
Vol 8 (7) ◽  
pp. 507
Author(s):  
Jie Dong ◽  
Leiping Xue ◽  
Kaiyu Cheng ◽  
Jian Shi ◽  
Chi Zhang
Keyword(s):  
Wave Length ◽  
Wave Forces ◽  
Linear Wave ◽  
Intermediate Water ◽  
Vertical Force ◽  
Wave Loads ◽  
Horizontal Plate ◽  
Flat Bottom ◽  
Simple Slope ◽  
Submerged Horizontal Plate

We experimentally investigated the forces induced by monochromatic and solitary waves on a submerged horizontal plate in a wave flume. The experimental results of two-dimensional wave forces on the plate over a 1:10 simple slope and a flat bottom are presented. The effects of the uneven bottom on wave loads are discussed by comparing the results with those in a constant water depth. The measured nonlinear wave forces exhibited considerable discrepancies with the theoretical results from the linear wave theory. The wave forces on the plate induced by monochromatic waves over the simple slope in intermediate water showed no appreciable difference with the flat-bottom results. The solitary wave forces in terms of the downward vertical force and overturning moment significantly decreased in the existence of the simple slope. Furthermore, the dependency of the wave length, wave height and the submergence depth on the wave loads is also discussed.

scholarly journals Numerical study on breaking solitary wave force on box-girder bridge

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Wanli Yang ◽  
Sijing Li ◽  
Junling Liu ◽  
Wenbo Wu ◽  
Hui Li ◽  
...  
Keyword(s):  
Solitary Wave ◽  
Static Pressure ◽  
Numerical Study ◽  
Wave Force ◽  
Generation Mechanism ◽  
Bridge Engineering ◽  
Vertical Force ◽  
Horizontal Force ◽  
Box Girder ◽  
Force Calculation

AbstractSolitary wave is often used to simulate tsunami propagating in deep water and breaking solitary wave is often used to simulate tsunami bore propagating in shallow water or on land. The breaking solitary wave force on box-girder, which has been widely used in bridge engineering in coastal areas of China, receives few attentions. This study aims to investigate characteristics and generation mechanism of breaking solitary wave force on box-girder numerically. A numerical wave flume with a 1:20 slope was built firstly, then the solitary wave generation ability, wave deformation and wave breaking on the slope, as well as wave force calculation precision, are validated. The water depth 0.6 m, the slope gradient 1:20 and the distance between slope top and box-girder 2.0 m remain unchanged, while the wave height and clearance changes in different cases. The time histories of horizontal force and vertical force on box-girder can be divided into three and four stages respectively according to their characteristics. The surface of box-girder is decomposed into a series of panels to facilitate exploring tsunami bore force generation mechanism. Results show horizontal force is dominated by static pressure on upstream vertical panels and vertical force is mainly contributed by static pressure on upstream horizontal panels and on panels in the chambers. Tsunami bore overtopping the box-girder deck impacts the top panel vigorously and results in the peak value of negative vertical force.

Wave Flume Tests to Check a Semi-Analytical Method for Calculating Solitary Wave Loads on Horizontal Cylinders

2017 ◽  
Author(s):  
Pasquale Filianoti ◽  
Luana Gurnari ◽  
Francesco Aristodemo ◽  
Giuseppe Tripepi
Keyword(s):  
Solitary Wave ◽  
Analytical Method ◽  
Wave Force ◽  
Horizontal Cylinder ◽  
Scale Model ◽  
Small Scale ◽  
Wave Loads ◽  
Wave Flume ◽  
Slowing Down ◽  
Submerged Cylinder

In this work, the solitary wave loads on a submerged horizontal circular cylinder are studied by comparing new analytical results with ad-hoc experimental data. The proposed analytical solution has been recently proposed by Gurnari and Filianoti (2017) and represents an extension of the formulation developed by Filianoti and Piscopo (2008) to assess the solitary wave loads acting on a submerged breakwater and tested in a wave flume on a small-scale model (Filianoti and Di Risio, 2012). Here we deal with a submerged horizontal cylinder following the concept that a solitary wave is subjected to a slowdown passing over a submerged cylinder. A laboratory investigation was addressed to calibrate the adopted semi-analytical method. The speed of the solitary wave celerity crossing the solid submerged cylinder was measured for several wave amplitudes. In the adopted wave flume at the University of Calabria equipped by a piston-type wavemaker, an horizontal cylinder with diameter D = 0.127 m was posed with its center at a depth of 0.2 m. Twelve transducers measured the instantaneous pressures along the external contour of the body. A battery of wave gauges measured the free surface elevation to evaluate the celerity crossing the equivalent water cylinder. Tests confirmed the existence of the slowing down of the celerity of the wave pressure. In other words, we found that the pressure wave is nearly double the time necessary to cross the cylinder with respect to the time necessary to cover the same distance in the undisturbed field, for solitary waves amplitudes ranging from about 0.08 and 0.19 times the water depth. The slowing down increases the horizontal wave force on the solid body with respect to the Froude-Krylov one. Moreover, it appears that in the adopted experimental range the wave force is essentially inertial if compared to the drag one, enabling us to rely upon a simplified analytical model to obtain an effective estimate of the horizontal force produced by a solitary wave on a cylinder.

Hydrodynamic coefficients of a floater near a partially reflecting seawall in the presence of an array of caisson blocks

2021 ◽  
pp. 1-23
Author(s):  
K G Vijay ◽  
Santanu Koley ◽  
Kshma Trivedi ◽  
Chandra Shekhar Nishad
Keyword(s):  
Wave Scattering ◽  
Structural Parameters ◽  
Wave Force ◽  
Vertical Force ◽  
Hydrodynamic Coefficients ◽  
Floating Structure ◽  
Surface Gravity Wave ◽  
Damping Coefficients ◽  
Half Wavelength ◽  
Scattering And Radiation

Abstract In the present study, surface gravity wave scattering and radiation by a freely floating rectangular buoy placed near a partially reflecting seawall and in the presence of an array of caisson blocks are analyzed. Various hydrodynamic parameters related to the wave scattering and radiation, such as the added mass and radiation damping coefficients, correspond to sway, heave and roll motions of the floating buoy, horizontal force, vertical force and moment acting on the floating structure, and horizontal wave force acting on the partially reflecting seawall are studied for a variety of wave and structural parameters. The study reveals that the resonating pattern in various hydrodynamic coefficients occurs for moderate values of the wavenumber. Further, when the distance between the floater and the sidewall is an integral time of half wavelength, the resonating behavior in the sway, heave and roll added masses, and associated damping coefficients appears, and the aforementioned hydrodynamic coefficients change rapidly around this zone. These resonance phenomena can be diminished significantly with appropriate positioning of the floater with respect to the sidewall and in the presence of partially reflecting seawall.

scholarly journals PREDICTION OF WAVE FORCE ACTING ON HORIZONTAL PLATE

2012 ◽  
Vol 1 (33) ◽  
pp. 52 ◽  
Author(s):  
Susumu Araki ◽  
Ichiro Deguchi
Keyword(s):  
Numerical Model ◽  
Wave Force ◽  
Experimental Results ◽  
Prediction Methods ◽  
Horizontal Plate

The applicability of the existing prediction methods of the wave force acting on a horizontal plate above the still water level is investigated by comparing the estimated wave force with the measured wave force. The applicability of a numerical model as well as the equations from experimental results is investigated. Some prediction methods overestimate the measured wave force, and some prediction methods underestimate the measured wave force.

scholarly journals Numerical Investigation on the Water Entry of Several Different Bow-Flared Sections

2020 ◽  
Vol 10 (22) ◽  
pp. 7952
Author(s):  
Qiang Wang ◽  
Boran Zhang ◽  
Pengyao Yu ◽  
Guangzhao Li ◽  
Zhijiang Yuan
Keyword(s):  
Stokes Equations ◽  
Water Entry ◽  
Navier Stokes ◽  
Hydrodynamic Characteristics ◽  
Time Step ◽  
Navier Stokes Equations ◽  
Surface Evolution ◽  
Mesh Method ◽  
The Difference ◽  
Dynamics Method

The bow-flared section may be simplified in the prediction of slamming loads and whipping responses of ships. However, the difference of hydrodynamic characteristics between the water entry of the simplified sections and that of the original section has not been well documented. In this study, the water entry of several different bow-flared sections was numerically investigated using the computational fluid dynamics method based on Reynolds-averaged Navier–Stokes equations. The motion of the grid around the section was realized using the overset mesh method. Reasonable grid size and time step were determined through convergence studies. The application of the numerical method in the water entry of bow-flared sections was validated by comparing the present predictions with previous numerical and experimental results. Through a comparative study on the water entry of one original section and three simplified sections, the influences of simplification of the bow-flared section on hydrodynamic characteristics, free surface evolution, pressure field, and impact force were investigated and are discussed here.

Inline and Vertical Wave Force Variation due to Burial of Submarine Pipeline in Random Wave Fields

2011 ◽  
Author(s):  
S. Neelamani ◽  
K. Al-Banaa
Keyword(s):  
Wave Force ◽  
The Other ◽  
Hydrodynamic Condition ◽  
Random Wave ◽  
Vertical Force ◽  
Submarine Pipeline ◽  
Other Hand ◽  
Sea Bed ◽  
Good For ◽  
Depth Of Burial

Marine pipelines encounter significant dynamic forces due to the action of waves. In order to reduce such forces, they are buried below the seabed. The wave force on the pipeline at any depth of burial for the given hydrodynamic condition depends on the properties of the sea bed soil. Physical model is used for assessing the hydrodynamic force on the pipeline for a wide range of random wave conditions, for different burial depths and in four types of soils. It is found that for all the four soil types, the horizontal force reduces with increase in depth of burial, whereas the vertical force generally increases up to certain depth of burial, mainly due to the significant change in the magnitude as well as the phase lag between the pore water pressures in the vertical direction. Among the soils, well graded soil is good for half burial of pipeline, since the least vertical force occurs for this soil. On the other hand, uniformly graded and low hydraulic conductivity soil attracts the maximum vertical force for half burial. On the other hand, such soil is good for full burial or further increase of burial, since it attracts less vertical force when compared to the other soils. The results of this study will help the submarine pipeline design engineers to select the minimum safe burial depth in a range of cohesion-less soil.

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