scholarly journals Experimental study on plunging breaking waves in deep water

2015 ◽  
Vol 120 (3) ◽  
pp. 2007-2049 ◽  
Author(s):  
Ho-Joon Lim ◽  
Kuang-An Chang ◽  
Zhi-Cheng Huang ◽  
Byoungjoon Na
Keyword(s):  
Experimental Study ◽  
Deep Water ◽  
Breaking Waves

scholarly journals Development and Validation of Quasi-Eulerian Mean Three-Dimensional Equations of Motion Using the Generalized Lagrangian Mean Method

2021 ◽  
Vol 9 (1) ◽  
pp. 76
Author(s):  
Duoc Nguyen ◽  
Niels Jacobsen ◽  
Dano Roelvink
Keyword(s):  
Surface Waves ◽  
Deep Water ◽  
Surf Zone ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Breaking Waves ◽  
Successful Implementation ◽  
Random Waves ◽  
Mean Motion ◽  
Generalized Lagrangian

This study aims at developing a new set of equations of mean motion in the presence of surface waves, which is practically applicable from deep water to the coastal zone, estuaries, and outflow areas. The generalized Lagrangian mean (GLM) method is employed to derive a set of quasi-Eulerian mean three-dimensional equations of motion, where effects of the waves are included through source terms. The obtained equations are expressed to the second-order of wave amplitude. Whereas the classical Eulerian-mean equations of motion are only applicable below the wave trough, the new equations are valid until the mean water surface even in the presence of finite-amplitude surface waves. A two-dimensional numerical model (2DV model) is developed to validate the new set of equations of motion. The 2DV model passes the test of steady monochromatic waves propagating over a slope without dissipation (adiabatic condition). This is a primary test for equations of mean motion with a known analytical solution. In addition to this, experimental data for the interaction between random waves and a mean current in both non-breaking and breaking waves are employed to validate the 2DV model. As shown by this successful implementation and validation, the implementation of these equations in any 3D model code is straightforward and may be expected to provide consistent results from deep water to the surf zone, under both weak and strong ambient currents.

Focused Plunging Breaking Waves Impact on Cylinder Group in Deep Water

2021 ◽  
Author(s):  
Ting Cui ◽  
Arun Kamath ◽  
Weizhi Wang ◽  
Lihao Yuan ◽  
Duanfeng Han ◽  
...  
Keyword(s):  
Free Surface ◽  
Deep Water ◽  
Breaking Waves ◽  
Surface Elevation ◽  
Relative Distance ◽  
Structural Safety ◽  
Wave Forces ◽  
Free Surface Elevation ◽  
Single Cylinder ◽  
Numerical Wave

Abstract The correct estimation of wave loading on a cylinder in a cylinder group under different impact scenarios is essential to determine the structural safety of coastal and offshore structures. This scenario differs from the interaction of waves with a single cylinder but not a lot of studies focus on cylinder groups under different arrangements. In this study, the interaction between plunging breaking waves and cylinder groups in deep water is investigated using the two-phase flow model in REEF3D, an open-source computational fluid dynamics program. The Reynolds-averaged Navier-Stokes equation with the two equation k–Ω turbulence model is adopted to resolve the numerical wave tank, with free surface calculated using the level set method. In this study, focused waves in deep water were modeled with a fixed wave steepness method. Wave breaking occurs when the steepness of the wave crest front satisfies the breaking criteria. The model is validated by comparing the numerical wave forces and free surface elevation with measurements from experiments. The computational results show fairly good agreement with experimental data for both free surface elevation and wave forces. Four cases are simulated to investigate the interaction of breaking waves with a cylinder group with different relative distance, number of cylinders and arrangement. Results show that breaking wave forces on the upstream cylinder are smaller than on a single cylinder with a relative distance of one cylinder diameter. The wave forces on cylinders in the pile group are effected by the relative distance between cylinders. The staggered arrangement has a significant influence on the wave forces on the first and second cylinder. The interaction inside a cylinder group mostly happens between the neighbouring cylinders. These interactions are also effected by the relative distance and the numbers of the neighbouring cylinders.

scholarly journals Experimental study of growth kinetics of CO2 hydrates and multiphase flow properties of slurries in high pressure flow systems

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32873-32888 ◽  
Author(s):  
Xiao-fang Lv ◽  
Jiang-wei Zuo ◽  
Yang Liu ◽  
Shi-Dong Zhou ◽  
Da-yong Lu ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Growth Kinetics ◽  
Deep Water ◽  
Oil And Gas ◽  
Flow Properties ◽  
Field Development ◽  
Water Transportation ◽  
Oil And Gas Pipelines ◽  
Kinetics Of

The formation and accumulation of hydrates in high pressure oil and gas pipelines bring great risks to field development and deep-water transportation.

Experimental Study on the Influence of other Factors on Compression Resistance Performance of Emulsion Explosives in Deep Water

2014 ◽  
Vol 535 ◽  
pp. 729-733
Author(s):  
Lei Liu ◽  
Qiang Liu ◽  
Li Cheng
Keyword(s):  
Experimental Study ◽  
Water Content ◽  
Deep Water ◽  
Experimental Results ◽  
Paraffin Wax ◽  
Emulsion Explosive ◽  
Emulsion Explosives ◽  
Small Influence ◽  
Resistance Performance ◽  
Compression Resistance

Since oil phase materials, oxidizer, and water are important components of emulsion explosive, their influences on compression resistance performance of emulsion explosives in deep water was studied by using reusable experiment device to simulate the deep charging environment. The experimental results show that with the equivalent content of the oil phase material, the sequence of three oil phase types of emulsion explosives from good to bad in terms of compression resistance performance and explosion performance in deep water are composite wax, composite wax and machine oil, paraffin wax, vaseline and machine oil. With the equivalent content of oxidant, the type of oxidant species has quite small influence on compression resistance performance and explosion property. Within a certain range, water content has small influence on compression resistance performance, and explosion performance increases with the increasement of water content, while it significantly decreases with water content increasing to a certain amount.

Experimental study on the migration regularity of sand outside a large, deep-water, open caisson during sinking

2019 ◽  
Vol 193 ◽  
pp. 106601
Author(s):  
Bing-Nan Jiang ◽  
Meng-Ting Wang ◽  
Tao Chen ◽  
Lu-Lu Zhang ◽  
Jian-Lin Ma
Keyword(s):  
Experimental Study ◽  
Deep Water

scholarly journals Breaking waves in deep water: measurements and modeling of energy dissipation

2019 ◽  
Vol 69 (10) ◽  
pp. 1165-1179
Author(s):  
Fadia Ticona Rollano ◽  
Adam Brown ◽  
Ashley Ellenson ◽  
H. Tuba Özkan-Haller ◽  
Jim Thomson ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Deep Water ◽  
Breaking Waves

Experimental Study on the Response Behaviour of SeaStar Mini Tension Leg Platform Against Random Water Waves

2007 ◽  
Author(s):  
Hamid Alemi Ardakani ◽  
Mohammad Javad Ketabdari
Keyword(s):  
Experimental Study ◽  
Deep Water ◽  
Experimental Work ◽  
Water Waves ◽  
Degrees Of Freedom ◽  
Ocean Waves ◽  
Scaled Model ◽  
Wave Flume ◽  
Response Behaviour ◽  
New Generation

Among the compliant platforms, TLP is a vertically moored structure with excess buoyancy, used for deep water oil exploration. In this structure tethers can be tensioned to such an extent that heave, roll and pitch motions of the platform induced by ocean waves are virtually eliminated. SeaStar is new generation of mini tension leg platforms which is similar to a spar and has favorable response features of a TLP. This paper illustrates the results of experimental work performed on a 1/100 scaled model of SeaStar TLP in a wave flume. The study refers to the induced tension in different tendons of the model and the motion response behaviour of the model on different degrees of freedom under several directional impinging random water waves. The results are presented in the frequency domain and the response amplitude operator for each motion of the platform has been calculated.

Kinematic and dynamic evolution of deep water breaking waves

1996 ◽  
Vol 101 (C7) ◽  
pp. 16515-16531 ◽  
Author(s):  
Owen M. Griffin ◽  
Rodney D. Peltzer ◽  
Henry T. Wang ◽  
William W. Schultz
Keyword(s):  
Deep Water ◽  
Breaking Waves ◽  
Dynamic Evolution
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