Effects of the Initial Consolidation on the 3D Wave-Induced Seabed Response Around a Pile

2017 ◽  
Author(s):  
Jian Ding ◽  
Titi Sui ◽  
Chi Zhang ◽  
Yuan Li
Keyword(s):  
Numerical Model ◽  
Dynamic Response ◽  
Numerical Simulations ◽  
Normal Stress ◽  
Pile Foundation ◽  
Three Dimensional ◽  
Model Application ◽  
Effective Normal Stress ◽  
Wave Induced ◽  
Simulation Condition

Seabed consolidation state could be seen as the initial simulation condition for numerically simulating wave-induced seabed response. In this study, based on a three dimensional numerical model, effects of initial consolidation state on the 3D wave-induced unsaturated seabed response around mono-pile were investigated. By model application, the consolidation state of seabed around the pile foundation was described. Two common calculation approaches (seabed consolidation is considered or not) for wave-induced seabed response were compared by describing the distributions pattern of soil effective stresses and pore pressures around the pile. Significance of the consolidation state on seabed dynamic response against distances to pile was also carefully addressed. Numerical simulations indicated (1) the initial consolidation significantly increases the vertical effective normal stress in the vicinity of pile, (2) effects of the initial seabed consolidation on the wave-induced seabed response decrease with the increasing distance to the pile. This study suggests the initial consolidation should be considered in assessing the seabed stability for the design of the mono-pile foundation.

scholarly journals Effects of the Soil Property Distribution Gradient on the Wave-Induced Response of a Non-Homogeneous Seabed

2019 ◽  
Vol 7 (8) ◽  
pp. 281 ◽  
Author(s):  
Titi Sui ◽  
Yu Jin ◽  
Zhaojun Wang ◽  
Chi Zhang ◽  
Jian Shi
Keyword(s):  
Numerical Model ◽  
Dynamic Response ◽  
Soil Properties ◽  
Pore Pressure ◽  
Soil Property ◽  
Induced Response ◽  
Property Distribution ◽  
Effective Stresses ◽  
Soil Distribution ◽  
Wave Induced

The seabed is usually non-homogeneous in the real marine environment, and its response to the dynamic wave loading is of great concern to coastal engineers. Previous studies on the simulation of a non-homogeneous seabed response have mostly adopted a vertically layered seabed, in which homogeneous soil properties are assumed in the governing equations for one specified layer. This neglects the distribution gradient terms of soil property, thus leading to an inaccurate evaluation of the dynamic response of a non-homogeneous seabed. In this study, a numerical model for a wave-induced 3D non-homogeneous seabed response is developed, and the effects of the soil property distribution gradient on the wave-induced response of a non-homogeneous seabed are numerically investigated. The numerical model is validated, and the results of the present simulation agree well with those of previous studies. The validated model is applied to simulate an ideal two-dimensional (2D) vertical non-homogeneous seabed. The model is further applied to model the practical wave-induced dynamic response of a three-dimensional (3D) non-homogeneous seabed around a mono-pile. The difference in pore pressure and soil effective stresses due to the soil distribution gradient is investigated. The effects of the soil distribution gradient on liquefaction are also examined. Results of this numerical study indicate that (1) pore pressure decreases while soil effective stresses increase (the maximum difference of the effective stresses can reach 68.9 % p 0 ) with a non-homogeneous seabed if the distribution gradient terms of soil properties are neglected; (2) the effect of the soil property distribution gradient terms on the pore pressure becomes more significant at the upper seabed, while this effect on the soil effective stresses is enhanced at the lower seabed; (3) the effect of the soil distribution gradient on the seabed response is greatly affected by the wave reflection and diffraction around the pile foundation; and (4) the soil distribution gradient terms can be neglected in the evaluation of seabed liquefaction depth in engineering practice.

scholarly journals Assessing the Impact of the Tropopause on Mountain Waves and Orographic Precipitation Using Linear Theory and Numerical Simulations

2015 ◽  
Vol 72 (2) ◽  
pp. 803-820 ◽  
Author(s):  
Nicholas Siler ◽  
Dale Durran
Keyword(s):  
Numerical Simulations ◽  
Linear Theory ◽  
Three Dimensional ◽  
Orographic Precipitation ◽  
Two Dimensional ◽  
Tropopause Height ◽  
Atmospheric Conditions ◽  
Mountain Waves ◽  
Wave Induced ◽  
The Impact

Abstract The partial reflection of mountain waves at the tropopause has been studied extensively for its contribution to downslope windstorms, but its impact on orographic precipitation has not been addressed. Here linear theory and numerical simulations are used to investigate how the tropopause affects the vertical structure of mountain waves and, in turn, orographic precipitation. Relative to the no-tropopause case, wave-induced ascent above the windward slope of a two-dimensional ridge is found to be enhanced or diminished depending on the ratio of the tropopause height to the vertical wavelength of the mountain waves—defined here as the “nondimensional tropopause height” . In idealized simulations of flow over both two-dimensional and three-dimensional ridges, variations in are found to modulate the precipitation rate by roughly a factor of 2 under typical atmospheric conditions. The sensitivity of precipitation to is related primarily to the depth of windward ascent but also to the location and strength of leeside descent, with significant impacts on the distribution of precipitation across the range (i.e., the rain-shadow effect). Using a modified version of Smith and Barstad’s orographic precipitation model, variations in are found to produce significant rain-shadow variability in the Washington Cascades, perhaps explaining some of the variability in rain-shadow strength observed among Cascade storms.

scholarly journals SPH MODELING OF MEAN VELOCITY CIRCULATION IN A RIP CURRENT SYSTEM

2012 ◽  
Vol 1 (33) ◽  
pp. 37
Author(s):  
Rozita Jalali Farahani ◽  
Robert A. Dalrymple ◽  
Alexis Hérault ◽  
Giuseppe Bilotta
Keyword(s):  
Numerical Model ◽  
Dimensional Space ◽  
Current System ◽  
Three Dimensional ◽  
Rip Current ◽  
Mean Velocity ◽  
Circulation Cell ◽  
Particle Hydrodynamics ◽  
Horizontal Variations ◽  
Wave Induced

A Lagrangian numerical model called Smoothed Particle Hydrodynamics is used to analyze rip current system generated by a single bar and a rip channel. The pattern of the wave-induced circulation cell over the bar, the oppositely-rotating circulation cell on-shore and a strong seaward-directed current in the rip channel is modeled numerically. The mean horizontal variations of rip current system as well as three-dimensional circulations are studied. The results in three-dimensional space reveal the wave-current interaction and flow patterns in different parts of rip channel, bar, and the trough located near shore. For comparison to experimental data, Eulerian nodes are introduced to the numerical model and SPH interpolation over neighboring Lagrangian particles is implemented to find fluid parameters at those specific nodes. This methodology leads to a better understanding of depth-integrated flows and a more accurate comparison of numerical results with experimental results. Model predictions are compared to laboratory measurements of Drønen et al. (2002) and show good agreement, including mean velocity profiles, mean surface elevation and three-dimensional velocity components.

scholarly journals Dynamic response of the mooring system in the floating photovoltaic power station

2021 ◽  
Vol 2087 (1) ◽  
pp. 012028
Author(s):  
Fei Yu ◽  
Yi Su ◽  
Yuliang Liu ◽  
Haibo Liu ◽  
Fei Duan
Keyword(s):  
Numerical Model ◽  
Dynamic Response ◽  
Potential Theory ◽  
Carbon Emission ◽  
Three Dimensional ◽  
Mooring System ◽  
Power Station ◽  
Mooring Lines ◽  
Environmental Loads ◽  
Photovoltaic Power

Abstract The floating photovoltaic power (FPV) station becomes popular to decrease carbon emission. However, limited research has been done on the dynamic response of the mooring lines of the FPV array. Based on a typical 2.14MW FPV array, this study investigates the displacement of the array and the mooring tension of the mooring lines. The numerical model of the FPV array is built through three-dimensional potential theory with 124 mooring lines. Firstly, the effect of the environment on the response is investigated under wave-only, current-only and wind-only conditions. Then, the tension and motion in the combined environmental loads are analyzed. It is found that the wind load has the greatest influence on the motion and mooring tension on the FPV power station, the effect of wave and current on the response is very limited.

Three-Dimensional Modeling of Wave-Induced Seabed Response Around a Semi-Buried Pipeline: A Small-Scale Case

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Jianfeng Zhu ◽  
Hongyi Zhao
Keyword(s):  
Numerical Model ◽  
Three Dimensional ◽  
The Body ◽  
Navier Stokes ◽  
Small Scale ◽  
Buried Pipeline ◽  
Consolidation Process ◽  
Soil Response ◽  
Wave Flume ◽  
Wave Induced

Abstract In this paper, a three-dimensional integrated numerical model for a small-scale case of wave-induced oscillatory soil response around a semi-buried pipeline (PORO-WSSI-PIPE 3D) is proposed. In this model, we combine the Reynolds-averaged Navier–Stokes (RANS) equations for the 3D wave motions and the Biot’s consolidation equations for a porous elastic seabed foundation through pressure continuity at common boundaries, with pipeline being an elastic and impermeable medium. The computational results are validated through comparison with previous analytical solutions and laboratory wave flume tests, obtaining good agreement. Following validation, the numerical model is applied to simulate wave-seabed-pipeline interaction with different obliquities between pipeline and incident wave, varying from 30 deg to 90 deg. Snapshots of wave-seabed-pipeline interaction, as well as dynamic pore pressure distributions at typical locations in the vicinity of a semi-buried pipeline, are obtained and analyzed. The three-dimensional consolidation process of seabed under gravitational forces including the body forces of a pipeline is also discussed.

scholarly journals A Three-Dimensional Numerical Study of Wave Induced Currents in the Cetraro Harbour Coastal Area (Italy)

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 935 ◽  
Author(s):  
Giovanni Cannata ◽  
Federica Palleschi ◽  
Benedetta Iele ◽  
Francesco Cioffi
Keyword(s):  
Numerical Simulations ◽  
Stokes Equations ◽  
Numerical Study ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Coastal Currents ◽  
Navier Stokes Equations ◽  
Vertical Coordinate ◽  
Wave Event ◽  
Wave Induced

In this paper we propose a three-dimensional numerical study of the coastal currents produced by the wave motion in the area opposite the Cetraro harbour (Italy), during the most significant wave event for the coastal sediment transport. The aim of the present study is the characterization of the current patterns responsible for the siltation that affects the harbour entrance area and the assessment of a project solution designed to limit this phenomenon. The numerical simulations are carried out by a three-dimensional non-hydrostatic model that is based on the Navier–Stokes equations expressed in integral and contravariant form on a time-dependent curvilinear coordinate system, in which the vertical coordinate moves in order to follow the free surface variations. The numerical simulations are carried out in two different geometric configurations: a present configuration, that reproduces the geometry of the coastal defence structures currently present in the harbour area and a project configuration, which reproduces the presence of a breakwater designed to modify the coastal currents in the area opposite the harbour entrance.

scholarly journals Three-dimensional numerical model for wave-induced seabed response around mono-pile

2015 ◽  
Vol 11 (6) ◽  
pp. 667-678 ◽  
Author(s):  
Titi Sui ◽  
Chi Zhang ◽  
Yakun Guo ◽  
Jinhai Zheng ◽  
Dongsheng Jeng ◽  
...  
Keyword(s):  
Numerical Model ◽  
Three Dimensional ◽  
Wave Induced

scholarly journals Research on Influence of Deep Foundation Pit Excavation and Dewatering on Pile Foundation of Railway Bridge

2021 ◽  
Vol 283 ◽  
pp. 01019
Author(s):  
Liu Tianyun ◽  
Yu Changyi ◽  
Zhu Nan
Keyword(s):  
Numerical Model ◽  
Pile Foundation ◽  
Three Dimensional ◽  
Railway Bridge ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Maximum Settlement ◽  
Limit Value ◽  
Construction Optimization

The three-dimensional numerical model of the foundation pit engineering is established, and the fluid-structure coupling method is used to calculate the settlement of the pile foundation of the adjacent railway bridge caused by the excavation and dewatering of the foundation pit. The results show that the settlement range of the soil around the foundation pit reaches 140m, and the pile foundation of the railway bridge is within the influence range, but the maximum settlement value does not exceed the limit value specified in the design. The method used in this paper provides effective guidance for the construction optimization of the same type of projects and reduces the project cost.

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