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The influence of increased ambient turbulent intensity (ATI) on the wake of a three bladed tidal turbine has been measured experimentally in a recirculating water flume. The velocity deficit, turbulence intensity and Reynolds stress data of the wake was obtained from three-dimensional transient measurements, given via a detailed Acoustic Doppler Velocimeter. The disc-integrated velocity deficit and turbulence intensity were used to describe the performance of downstream turbine and wake homogeneity in a qualitative manner. Meanwhile, the principal values of Reynolds-stress anisotropy tensor and Lumley triangle were used to illustrate the degree of turbulence anisotropy within the turbine's wake. From results, the slightly increased ATI would accelerate the far wake recovery, decrease inhomogeneity and increase the energy utilization of downstream turbine and degree of wake turbulence anisotropy. The presented results are crucial in the view of investigation of the effect of ATI on wake propagation processes.
Zhi Zhang; Yuquan Zhang; Jisheng Zhang; Yuan Zheng; Wei Zang; Xiangfeng Lin; E. Fernandez-Rodriguez. Experimental study of the wake homogeneity evolution behind a horizontal axis tidal stream turbine. Applied Ocean Research 2021, 111, 102644 .
AMA StyleZhi Zhang, Yuquan Zhang, Jisheng Zhang, Yuan Zheng, Wei Zang, Xiangfeng Lin, E. Fernandez-Rodriguez. Experimental study of the wake homogeneity evolution behind a horizontal axis tidal stream turbine. Applied Ocean Research. 2021; 111 ():102644.
Chicago/Turabian StyleZhi Zhang; Yuquan Zhang; Jisheng Zhang; Yuan Zheng; Wei Zang; Xiangfeng Lin; E. Fernandez-Rodriguez. 2021. "Experimental study of the wake homogeneity evolution behind a horizontal axis tidal stream turbine." Applied Ocean Research 111, no. : 102644.
With the rapid development in the exploration of marine resources, coastal geohazard and offshore geotechnics have attracted a great deal of attention from coastal geotechnical engineers and has achieved significant progress in recent years
Dong-Sheng Jeng; Jisheng Zhang; Özgür Kirca. Coastal Geohazard and Offshore Geotechnics. Journal of Marine Science and Engineering 2020, 8, 1011 .
AMA StyleDong-Sheng Jeng, Jisheng Zhang, Özgür Kirca. Coastal Geohazard and Offshore Geotechnics. Journal of Marine Science and Engineering. 2020; 8 (12):1011.
Chicago/Turabian StyleDong-Sheng Jeng; Jisheng Zhang; Özgür Kirca. 2020. "Coastal Geohazard and Offshore Geotechnics." Journal of Marine Science and Engineering 8, no. 12: 1011.
Laboratory experiments have been carried out to investigate wave damping over the seabed, in which the excess pore pressure and free surface elevations are synchronously measured for examining the wave-induced soil dynamics and wave kinematics. Two types of soil, namely fine sand and silt, are tested to examine the role of soil in the wave damping. Observation of experiments shows that (i) soil liquefaction takes place for some tests with silty bed and soil particles suspend into the water layer when the bed is made of silt; (ii) sand ripples can be generated for experiments with sand bed. Measurements reveal that the wave damping greatly depends on the soil dynamic responses to wave loading and the wave damping mechanism over the silty seabed differs from that over the sand bed. On the one hand, the wave damping rate is greatly increased, when soil liquefaction occurs in the silty bed. On the other hand, the presence of sand ripples generated by oscillatory flow in the sand bed experiments also increases the wave damping to some extent. Furthermore, experimental results show that soil particle suspension in the silt bed test contributes to the wave damping. Theoretical analysis is presented to enhance discussions on the wave damping. The theoretical calculations demonstrate that the wave damping is mainly induced by the shear stress in the boundary layer for the cases when no liquefaction occurs. While for the cases when soil liquefaction takes place, the viscous flow in the liquefied layer contributes most towards to the wave damping.
Linlong Tong; Jisheng Zhang; Jialin Zhao; Jinhai Zheng; Yakun Guo. Modelling study of wave damping over a sandy and a silty bed. Coastal Engineering 2020, 161, 103756 .
AMA StyleLinlong Tong, Jisheng Zhang, Jialin Zhao, Jinhai Zheng, Yakun Guo. Modelling study of wave damping over a sandy and a silty bed. Coastal Engineering. 2020; 161 ():103756.
Chicago/Turabian StyleLinlong Tong; Jisheng Zhang; Jialin Zhao; Jinhai Zheng; Yakun Guo. 2020. "Modelling study of wave damping over a sandy and a silty bed." Coastal Engineering 161, no. : 103756.
Despite the numerous ideas concept for an offshore wind turbine foundation, the monopile foundation is the most widely adopted concept in engineering practices. In this paper, a 3-dimensional integrated numerical model is established to study the wave-induced oscillatory seabed responses around a monopile foundation by adopting the Reynolds-Average Navier-Stokes (RANS) equation with turbulence closure model for the mean flow and the Biot’s consolidation equation for porous seabed as the governing equations respectively. The present wave and seabed sub-models in this studies are verified with physical experimental results and an analytical solution, while for the monopile structure, the wave impact force exerted on it are calculated and verified with physical experimental data to show that the present model has the ability to simulate the wave-seabed-pile structure interaction (WSSI-PILE). The numerical investigations on the monopile foundation indicated that the wave impact force on the pile structure and the seabed foundation has a very significant impact on horizontal displacement of the monopile within the seabed and the pile rocking motion. Parametric studies analysis on the effect of wave height, seabed permeability and pile structure diameter also indicated significant influence on the oscillatory wave-induced dynamic responsek−ε .
Richard Asumadu; Jisheng Zhang; H. Y. Zhao; Hubert Osei-Wusuansa. A 3D numerical analysis of wave-induced seabed response around a monopile structure. Geomechanics and Geoengineering 2019, 1 -21.
AMA StyleRichard Asumadu, Jisheng Zhang, H. Y. Zhao, Hubert Osei-Wusuansa. A 3D numerical analysis of wave-induced seabed response around a monopile structure. Geomechanics and Geoengineering. 2019; ():1-21.
Chicago/Turabian StyleRichard Asumadu; Jisheng Zhang; H. Y. Zhao; Hubert Osei-Wusuansa. 2019. "A 3D numerical analysis of wave-induced seabed response around a monopile structure." Geomechanics and Geoengineering , no. : 1-21.
In this paper, preliminary study is conducted on oscillatory wave-induced seabed response around three configuration cases of pile support foundations applying a 3-dimensional integrated numerical model to study and comparatively analyzed them. In the past, numerous studies have been conducted into exploring the wave-seabed-structure interaction (WSSI) mostly around monopile. However, attention on other pile support structure foundations is minimal. In this present study, Reynolds-Average Navier–Stokes equations with k-turbulence closure as well as Biot’s poroelastic theory are employed to govern the wave motion and porous seabed foundation respectively. The present numerical model is compared with available physical experimental data to determine its capability of simulating the WSSI around pile structures. Results analysis indicate that the impact of wave forces and wave pressure on the gravity-based support foundation is relatively higher than that of the monopile and tripod support pile due to the large peripheral area it occupied. Result of the momentary wave-induced liquefaction depth for the three configuration cases of pile structures at the upstream side in the seabed foundation shows that the tripod support pile has higher tendency resistance against wave-induced liquefaction, which may perhaps be due to the additional legs.
Richard Asumadu; Jisheng Zhang; H. Y. Zhao; Hubert Osei-Wusuansa; Alex Baffour Akoto. 3-Dimensional numerical study of wave-induced seabed response around three different types of wind turbine pile foundations. SN Applied Sciences 2019, 1, 1401 .
AMA StyleRichard Asumadu, Jisheng Zhang, H. Y. Zhao, Hubert Osei-Wusuansa, Alex Baffour Akoto. 3-Dimensional numerical study of wave-induced seabed response around three different types of wind turbine pile foundations. SN Applied Sciences. 2019; 1 (11):1401.
Chicago/Turabian StyleRichard Asumadu; Jisheng Zhang; H. Y. Zhao; Hubert Osei-Wusuansa; Alex Baffour Akoto. 2019. "3-Dimensional numerical study of wave-induced seabed response around three different types of wind turbine pile foundations." SN Applied Sciences 1, no. 11: 1401.
With the development of offshore wind energy in China, more and more offshore wind turbines are being constructed in rock-based sea areas. However, the large diameter and thin-walled steel rock-socketed monopiles are very scarce at present, and both the construction and design are very difficult. For the design, the dynamic safety during the whole lifetime of the wind turbine is difficult to guarantee. Dynamic safety of a turbine is mostly controlled by the dynamic impedances of the rock-socketed monopile, which are still not well understood. How to choose the appropriate impedances of the socketed monopiles so that the wind turbines will neither resonant nor be too conservative is the main problem. Based on a numerical model in this study, the accurate impedances are obtained for different frequencies of excitation, different soil and rock parameters, and different rock-socketed lengths. The dynamic stiffness of monopile increases, while the radiative damping decreases as rock-socketed depth increases. When the weathering degree of rock increases, the dynamic stiffness of the monopile decreases, while the radiative damping increases.
Rui He; Ji Ji; Jisheng Zhang; Wei Peng; Zufeng Sun; Zhen Guo. Dynamic Impedances of Offshore Rock-Socketed Monopiles. Journal of Marine Science and Engineering 2019, 7, 134 .
AMA StyleRui He, Ji Ji, Jisheng Zhang, Wei Peng, Zufeng Sun, Zhen Guo. Dynamic Impedances of Offshore Rock-Socketed Monopiles. Journal of Marine Science and Engineering. 2019; 7 (5):134.
Chicago/Turabian StyleRui He; Ji Ji; Jisheng Zhang; Wei Peng; Zufeng Sun; Zhen Guo. 2019. "Dynamic Impedances of Offshore Rock-Socketed Monopiles." Journal of Marine Science and Engineering 7, no. 5: 134.
This study aims to investigate the wake characteristics of a horizontal axis tidal stream turbine supported by a monopile using a numerical approach. Computational fluid dynamics (CFD) simulations based on the open source software OpenFOAM have been performed to enhance understanding of a turbine’s wake. The numerical simulations adopt both the actuator line method and the full rotor geometry method. The numerical results are found to be consistent with experimental data, although some discrepancies are observed at a distance of one rotor diameter downstream. Comparison of numerical results from both methods is performed. The results show that both methods can obtain important flow features and provide similar simulation in the wake of the turbine model. The actuator line method is able to give a better prediction in stream-wise velocity distribution, although it underestimates the turbulence intensity, circumferential velocity and vorticity magnitude slightly, compared with the full rotor geometry method. It is also found that the wake of the monopile and the rotor interact strongly in the downstream field, especially in the region immediately behind the structure. A strong interaction occurs within approximately two rotor diameters downstream.
Xiang-Feng Lin; Ji-Sheng Zhang; Yu-Quan Zhang; Jing Zhang; Sheng Liu. Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine. Water 2019, 11, 560 .
AMA StyleXiang-Feng Lin, Ji-Sheng Zhang, Yu-Quan Zhang, Jing Zhang, Sheng Liu. Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine. Water. 2019; 11 (3):560.
Chicago/Turabian StyleXiang-Feng Lin; Ji-Sheng Zhang; Yu-Quan Zhang; Jing Zhang; Sheng Liu. 2019. "Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine." Water 11, no. 3: 560.
Flow-induced vibration (FIV) of a flexible plate located in the wake of a rigid circular cylinder is investigated numerically in this study. Computations are performed at two Reynolds numbers Re = 100 and 200, with the plate bending stiffness KB varying from 0.00563 to 0.36. The gap spacing between the cylinder and the plate varies within the range of 2.0 ≤ S/D ≤ 5.0 (D is the cylinder diameter). Numerical results show that the optimum location with the maximum vibration response is found to be the medium spacing, within which the vortex structures are fully formed in the gap and impinge on the plate successively. The maximum peak amplitude of the tip appears at the smallest KB where the plate experiences the first- and second-bending motions; accordingly, the orbit of the tip presents a clear “Figure-8” pattern, indicating that the bending deformation has strong nonlinearity. It is also found that there are two mechanisms driving the plate to vibrate in both first- and second-bending modes. The first mechanism is the vortex impingement with the low pressure core, while the second is the high pressure region induced by the stagnation of flow near the turn-up part of the plate.
Huakun Wang; Qiu Zhai; Jisheng Zhang. Numerical study of flow-induced vibration of a flexible plate behind a circular cylinder. Ocean Engineering 2018, 163, 419 -430.
AMA StyleHuakun Wang, Qiu Zhai, Jisheng Zhang. Numerical study of flow-induced vibration of a flexible plate behind a circular cylinder. Ocean Engineering. 2018; 163 ():419-430.
Chicago/Turabian StyleHuakun Wang; Qiu Zhai; Jisheng Zhang. 2018. "Numerical study of flow-induced vibration of a flexible plate behind a circular cylinder." Ocean Engineering 163, no. : 419-430.
The phenomenon of wave-seabed-pipeline interactions is one of the primary concerns of coastal engineers and researchers, as it could greatly affect the seabed instability and pipeline safety. Numerous researchers have expended great effort in studying wave-seabed-pipeline interactions in the past. However, the majority of them focussed on the wave-induced response around a submarine pipeline, in buried conditions, by numerical models and laboratory experiments. Unlike the previous studies, a series of regular wave experiments and numerical model analyses were conducted to investigate the wave-induced pore pressure in the sandy seabed, around a pipeline with different backfilled depths. The model pipeline with three diameters (D = 6 cm, 8 cm, and 10 cm) is buried in three sizes of sand, d50 = 0.15 mm, d50 = 0.3 mm, and d50 = 0.5 mm, with different backfilled depths. The results show that the pore pressure amplitude in the seabed is a minimum with a backfilled depth D, and a maximum with full backfill or a backfilled depth of zero. The pore-pressure amplitude increases as the backfill sand median diameter increases. The effects of the pipeline diameter on pore-water pressure are also analysed and discussed.
Yanyan Zhai; Rui He; Jialin Zhao; Jisheng Zhang; Dong-Sheng Jeng; Ling Li. Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed. Applied Ocean Research 2018, 75, 37 -52.
AMA StyleYanyan Zhai, Rui He, Jialin Zhao, Jisheng Zhang, Dong-Sheng Jeng, Ling Li. Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed. Applied Ocean Research. 2018; 75 ():37-52.
Chicago/Turabian StyleYanyan Zhai; Rui He; Jialin Zhao; Jisheng Zhang; Dong-Sheng Jeng; Ling Li. 2018. "Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed." Applied Ocean Research 75, no. : 37-52.
The failure of marine structures is often attributed to liquefaction in loose sand deposits that are subjected to ocean waves. In this study, a two-dimensional integrated numerical model is developed to characterize the liquefaction behaviours of loosely deposited seabed foundations under various types of ocean waves. In the present model, Reynolds-Averaged Navier–Stokes (RANS) equations are used to simulate the surface wave motion, and Biot's consolidation equations are used to link the solid-pore fluid interactions in a porous medium. A poro-elasto-plastic solution is used to reproduce foundation behaviour under cyclic shearing. Unlike previous investigations, both oscillatory and residual soil responses were considered; they are coupled in an instantaneous approach. Verification of the model results to the previous centrifugal wave tests is carried out, obtaining fairly good agreement. Numerical examples show that foundation behaviour under various types of wave loading, particularly standing waves or a solitary wave, embodies a completely two-dimensional process in terms of residual pore pressure development. The parametric studies demonstrate that liquefaction caused by the build-up of pore pressures is more likely to occur in loosely deposited sand foundations with poor drainage and under large waves.
H.-Y Zhao; D.-S. Jeng; Chencong Liao; J.-S. Zhang; Z. Guo; W.-Y. Chen. Numerical modelling of liquefaction in loose sand deposits subjected to ocean waves. Applied Ocean Research 2018, 73, 27 -41.
AMA StyleH.-Y Zhao, D.-S. Jeng, Chencong Liao, J.-S. Zhang, Z. Guo, W.-Y. Chen. Numerical modelling of liquefaction in loose sand deposits subjected to ocean waves. Applied Ocean Research. 2018; 73 ():27-41.
Chicago/Turabian StyleH.-Y Zhao; D.-S. Jeng; Chencong Liao; J.-S. Zhang; Z. Guo; W.-Y. Chen. 2018. "Numerical modelling of liquefaction in loose sand deposits subjected to ocean waves." Applied Ocean Research 73, no. : 27-41.
It is important to understand tidal stream turbine performance and flow field, if tidal energy is to advance. The operating condition of a tidal stream turbine with a supporting structure has a significant impact on its performance and wake recovery. The aim of this work is to provide an understanding of turbine submerged depth that governs the downstream wake structure and its recovery to the free-stream velocity profile. An experimentally validated numerical model, based on a computational fluid dynamics (CFD) tool, was present to obtain longitudinal, transverse and vertical velocity profiles. Wake characteristics measurements have been carried out in an open channel at Hohai University. The results indicate that varying the turbine proximity to the water surface introduces differential mass flow rate around the rotor that could make the wake persist differently downstream. CFD shows the same predicted wake recovery tendency with the experiments, and an agreement from CFD and experiments is good in the far-wake region. The results presented demonstrate that CFD is a good tool to simulate the performance of tidal turbines particularly in the far-wake region and that the turbine proximity to the water surface has an effect on the wake recovery.
Yuquan Zhang; Jisheng Zhang; Yuan Zheng; Chunxia Yang; Wei Zang; E. Fernandez-Rodriguez. Experimental Analysis and Evaluation of the Numerical Prediction of Wake Characteristics of Tidal Stream Turbine. Energies 2017, 10, 2057 .
AMA StyleYuquan Zhang, Jisheng Zhang, Yuan Zheng, Chunxia Yang, Wei Zang, E. Fernandez-Rodriguez. Experimental Analysis and Evaluation of the Numerical Prediction of Wake Characteristics of Tidal Stream Turbine. Energies. 2017; 10 (12):2057.
Chicago/Turabian StyleYuquan Zhang; Jisheng Zhang; Yuan Zheng; Chunxia Yang; Wei Zang; E. Fernandez-Rodriguez. 2017. "Experimental Analysis and Evaluation of the Numerical Prediction of Wake Characteristics of Tidal Stream Turbine." Energies 10, no. 12: 2057.
The Taiwan Strait has recently been proposed as a promising site for dynamic tidal power systems because of its shallow depth and strong tides. Dynamic tidal power is a new concept for extracting tidal potential energy in which a coast-perpendicular dike is used to create water head and generate electricity via turbines inserted in the dike. Before starting such a project, the potential power output and hydrodynamic impacts of the dike must be assessed. In this study, a two-dimensional numerical model based on the Delft3D-FLOW module is established to simulate tides in China. A dike module is developed to account for turbine processes and estimate power output by integrating a special algorithm into the model. The domain decomposition technique is used to divide the computational zone into two subdomains with grid refinement near the dike. The hydrodynamic processes predicted by the model, both with and without the proposed construction, are examined in detail, including tidal currents and tidal energy flux. The predicted time-averaged power yields with various opening ratios are presented. The results show that time-averaged power yield peaks at an 8% opening ratio. For semidiurnal tides, the flow velocity increases in front of the head of the dike and decreases on either side. For diurnal tides, these changes are complicated by the oblique incidence of tidal currents with respect to the dike as well as by bathymetric features. The dike itself blocks the propagation of tidal energy flux.
Peng Dai; Jisheng Zhang; Jinhai Zheng. Tidal current and tidal energy changes imposed by a dynamic tidal power system in the Taiwan Strait, China. Journal of Ocean University of China 2017, 16, 953 -964.
AMA StylePeng Dai, Jisheng Zhang, Jinhai Zheng. Tidal current and tidal energy changes imposed by a dynamic tidal power system in the Taiwan Strait, China. Journal of Ocean University of China. 2017; 16 (6):953-964.
Chicago/Turabian StylePeng Dai; Jisheng Zhang; Jinhai Zheng. 2017. "Tidal current and tidal energy changes imposed by a dynamic tidal power system in the Taiwan Strait, China." Journal of Ocean University of China 16, no. 6: 953-964.
In recent decades, great efforts have been made to efficiently explore tidal stream energy due to its unique advantages of easy prediction and great potential. China recently launched a national tidal stream farm demonstration project in the waterway between Putuoshan and Hulu Islands in the Zhoushan area. Before deployment of the turbine array, it is necessary to understand the hydrodynamic changes associated with the construction of a turbine array. In this study, we developed a depth-averaged hydrodynamics model that solves the shallow water governing equations to simulate the tidal hydrodynamics around the Zhoushan Archipelago. The simulation results agree with field data in terms of the water elevation and stream velocity. We considered two types of turbine arrays in this study and investigated their impacts on the local hydrodynamics. In general, the stream velocity in the northern and southern areas is reduced due to the power take-off of the turbine array, whereas stream velocity in the western and eastern areas is slightly increased due to the blockage impact of the turbine array.
Zhiwen Yu; Jisheng Zhang; Yanyan Zhai; Jinhai Zheng. Numerical hydrodynamics study around turbine array of tidal stream farm in Zhoushan, China. Journal of Ocean University of China 2017, 16, 703 -708.
AMA StyleZhiwen Yu, Jisheng Zhang, Yanyan Zhai, Jinhai Zheng. Numerical hydrodynamics study around turbine array of tidal stream farm in Zhoushan, China. Journal of Ocean University of China. 2017; 16 (4):703-708.
Chicago/Turabian StyleZhiwen Yu; Jisheng Zhang; Yanyan Zhai; Jinhai Zheng. 2017. "Numerical hydrodynamics study around turbine array of tidal stream farm in Zhoushan, China." Journal of Ocean University of China 16, no. 4: 703-708.
Y. Zhang; D.-S. Jeng; H.-Y. Zha; J.-S. Zhang. An integrated model for pore pressure accumulations in marine sediment under combined wave and current loading. Geomechanics and Engineering 2016, 10, 387 -403.
AMA StyleY. Zhang, D.-S. Jeng, H.-Y. Zha, J.-S. Zhang. An integrated model for pore pressure accumulations in marine sediment under combined wave and current loading. Geomechanics and Engineering. 2016; 10 (4):387-403.
Chicago/Turabian StyleY. Zhang; D.-S. Jeng; H.-Y. Zha; J.-S. Zhang. 2016. "An integrated model for pore pressure accumulations in marine sediment under combined wave and current loading." Geomechanics and Engineering 10, no. 4: 387-403.
A 2-D integrated numerical model is developed for liquefaction due to the build-up of pore pressure in porous sloping seabed subject to solitary wave loading. In the integrated 2-D model, the propagation of a solitary wave over a porous sloping seabed is governed using the volume-averaged Reynolds averaged Navier–Stokes equations, in which discontinuity of the flow (i.e., wave breaking due to shoaling, hydraulic jump during the wave drawdown phase) can be captured with k−ϵk−ϵ model, while Biot’s consolidation equations are used for linking the solid–pore fluid interaction. Regarding the wave-induced residual soil response, a new 2-D pore pressure build-up model is developed with the new definition of the source term where the phase-resolved oscillatory shear stress is involved. The initial consolidation state of the sloping seabed foundation is considered under hydrostatic load using theory of poro-elasticity. The numerical results indicate that compared to a 1:6 slope, the wave-breaking process is more likely to occur in the case of a mild 1:15 slope due to wave shoaling and that a mild 1:15 slope experiences a longer duration of the wave run-up and drawdown compared to that in a steep 1:6 slope. Furthermore, the results suggest that the potential for liquefaction first occurs near the intersection between the initial shore line and the bed boundary. Then it will be extended both laterally and vertically to the neighboring points. The depth of the liquefaction zone increases and the width of the liquefaction zone decreases as the bed slope increases. Parametric studies indicate that the build-up of residual pore pressure can accumulate to a large value in the case of soil with lower permeability and lower relative density under larger wave loading.Griffith Sciences, Griffith School of EngineeringNo Full Tex
Hongyi Zhao; Dong-Sheng Jeng; Huijie Zhang; Ji-Sheng Zhang; Hong Zhang. 2-D integrated numerical modeling for the potential of solitary wave-induced residual liquefaction over a sloping porous seabed. Journal of Ocean Engineering and Marine Energy 2015, 2, 1 -18.
AMA StyleHongyi Zhao, Dong-Sheng Jeng, Huijie Zhang, Ji-Sheng Zhang, Hong Zhang. 2-D integrated numerical modeling for the potential of solitary wave-induced residual liquefaction over a sloping porous seabed. Journal of Ocean Engineering and Marine Energy. 2015; 2 (1):1-18.
Chicago/Turabian StyleHongyi Zhao; Dong-Sheng Jeng; Huijie Zhang; Ji-Sheng Zhang; Hong Zhang. 2015. "2-D integrated numerical modeling for the potential of solitary wave-induced residual liquefaction over a sloping porous seabed." Journal of Ocean Engineering and Marine Energy 2, no. 1: 1-18.
In this paper, we presented an integrated numerical model for the wave-induced residual liquefaction around a buried offshore pipeline. In the present model, unlike previous investigations, two new features were added in the present model: (i) new definition of the source term for the residual pore pressure generations was proposed and extended from 1D to 2D; (ii) preconsolidation due to self-weight of the pipeline was considered. The present model was validated by comparing with the previous experimental data for the cases without a pipeline and with a buried pipeline. Based on the numerical model, first, we examined the effects of seabed, wave and pipeline characteristics on the pore pressure accumulations and residual liquefaction. The numerical results indicated a pipe with a deeper buried depth within the seabed with larger consolidation coefficient and relative density can reduce the risk of liquefaction around a pipeline. Second, we investigated the effects of a trench layer on the wave-induced seabed response. It is found that the geometry of the trench layer (thickness and width), as well as the backfill materials (permeability K and relative density Dr) have significant effect on the development of liquefaction zone around the buried pipeline. Furthermore, under certain conditions, partially backfill the trench layer up to one pipeline diameter is sufficient to protect the pipelines from the wave-induced liquefaction.
H.-Y. Zhao; D.-S. Jeng; Z. Guo; J.-S. Zhang. Two-Dimensional Model for Pore Pressure Accumulations in the Vicinity of a Buried Pipeline. Journal of Offshore Mechanics and Arctic Engineering 2014, 136, 042001 .
AMA StyleH.-Y. Zhao, D.-S. Jeng, Z. Guo, J.-S. Zhang. Two-Dimensional Model for Pore Pressure Accumulations in the Vicinity of a Buried Pipeline. Journal of Offshore Mechanics and Arctic Engineering. 2014; 136 (4):042001.
Chicago/Turabian StyleH.-Y. Zhao; D.-S. Jeng; Z. Guo; J.-S. Zhang. 2014. "Two-Dimensional Model for Pore Pressure Accumulations in the Vicinity of a Buried Pipeline." Journal of Offshore Mechanics and Arctic Engineering 136, no. 4: 042001.
B. Liu; D.S. Jeng; J.S. Zhang. Dynamic Response in a Porous Seabed of Finite Depth to Combined Wave and Current Loadings. Journal of Coastal Research 2013, 30, 765 -776.
AMA StyleB. Liu, D.S. Jeng, J.S. Zhang. Dynamic Response in a Porous Seabed of Finite Depth to Combined Wave and Current Loadings. Journal of Coastal Research. 2013; 30 (4):765-776.
Chicago/Turabian StyleB. Liu; D.S. Jeng; J.S. Zhang. 2013. "Dynamic Response in a Porous Seabed of Finite Depth to Combined Wave and Current Loadings." Journal of Coastal Research 30, no. 4: 765-776.
D.-S. Jeng; Y. Zhang; J.-S. Zhang; C. Zhang; P. L.-F. Liu. NUMERICAL MODELLING OF WAVE-INDUCED SOIL RESPONSE AROUND BREAKWATER HEADS. Asian And Pacific Coasts 2011 2011, 789 -796.
AMA StyleD.-S. Jeng, Y. Zhang, J.-S. Zhang, C. Zhang, P. L.-F. Liu. NUMERICAL MODELLING OF WAVE-INDUCED SOIL RESPONSE AROUND BREAKWATER HEADS. Asian And Pacific Coasts 2011. 2011; ():789-796.
Chicago/Turabian StyleD.-S. Jeng; Y. Zhang; J.-S. Zhang; C. Zhang; P. L.-F. Liu. 2011. "NUMERICAL MODELLING OF WAVE-INDUCED SOIL RESPONSE AROUND BREAKWATER HEADS." Asian And Pacific Coasts 2011 , no. : 789-796.
J.-S. Zhang; D.-S. Jeng; P.L.-F. Liu. Numerical study for waves propagating over a porous seabed around a submerged permeable breakwater: PORO-WSSI II model. Ocean Engineering 2011, 38, 954 -966.
AMA StyleJ.-S. Zhang, D.-S. Jeng, P.L.-F. Liu. Numerical study for waves propagating over a porous seabed around a submerged permeable breakwater: PORO-WSSI II model. Ocean Engineering. 2011; 38 (7):954-966.
Chicago/Turabian StyleJ.-S. Zhang; D.-S. Jeng; P.L.-F. Liu. 2011. "Numerical study for waves propagating over a porous seabed around a submerged permeable breakwater: PORO-WSSI II model." Ocean Engineering 38, no. 7: 954-966.
X M Yan; L Li; Y Y Liang; Z Q Tao; X H Xu; Z J Chen; J S Zhang. [Effects of dimercaptosuccinic acid per os on copper excretion in rat]. Zhongguo yao li xue bao = Acta pharmacologica Sinica 1993, 14, 1 .
AMA StyleX M Yan, L Li, Y Y Liang, Z Q Tao, X H Xu, Z J Chen, J S Zhang. [Effects of dimercaptosuccinic acid per os on copper excretion in rat]. Zhongguo yao li xue bao = Acta pharmacologica Sinica. 1993; 14 ():1.
Chicago/Turabian StyleX M Yan; L Li; Y Y Liang; Z Q Tao; X H Xu; Z J Chen; J S Zhang. 1993. "[Effects of dimercaptosuccinic acid per os on copper excretion in rat]." Zhongguo yao li xue bao = Acta pharmacologica Sinica 14, no. : 1.