Numerical study for wave-induced oscillatory pore pressures and liquefaction around impermeable slope breakwater heads

The wave-induced resonant flow in a narrow gap between a stationary hull and a vertical wall is studied experimentally and numerically. Vortex shedding from the sharp bilge edge of the hull gives rise to a quadratically damped free surface response in the gap, where the damping coefficient is approximately independent of wave steepness and frequency. Particle image velocimetry and direct numerical simulations were used to characterise the shedding dynamics and explore the influence of discretisation in the measurements and computations. Secondary separation was identified as a particular feature which occurred at the hull bilge in these gap flows. This can result in the generation of a system with multiple vortical regions and asymmetries between the inflow and outflow. The shedding dynamics was found to exhibit a high degree of invariance to the amplitude in the gap and the spanwise position of the barge. The new measurements and the evaluation of numerical models of varying fidelity can assist in informing offshore operations such as the side by side offloading from floating liquefied natural gas facilities.

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Poro-Elasto-Plastic Model for Wave-Induced Liquefaction

Volume 3: Offshore Geotechnics ◽

10.1115/omae2014-24480 ◽

2014 ◽

Author(s):

Chengcong Liao ◽

Hongyi Zhao ◽

Dong-Sheng Jeng

Keyword(s):

Two Dimensional ◽

Plastic Model ◽

Centrifuge Tests ◽

Pore Pressures ◽

Proposed Model ◽

Progressive Waves ◽

Plastic Components ◽

Excess Pore Pressures ◽

Wave Induced ◽

Pore Pressure Build Up

In this study, a two-dimensional poro-elasto-plastic model for the wave-induced liquefaction in a porous seabed was presented. Two mechanisms of the wave-induced pore pressures were considered. Both elastic components (for oscillatory) and the plastic components (for residual) were integrated to predict the wave-induced excess pore pressures in marine sediments. The proposed 2D poro-elasto-plastic model allows for the pore pressure build-up process in a sandy seabed. The proposed model overall agreed well with the previous wave experiments and centrifuge tests. Numerical example shows that the pattern of progressive waves -induced liquefaction gradually changed from 2D to 1D.

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Numerical Study on Hydrodynamic Force and Wave Induced Vortex Dynamics around Cylindrical Pile

International Journal of coastal and offshore engineering ◽

10.29252/ijcoe.1.4.1 ◽

2018 ◽

Vol 1 (4) ◽

pp. 1-11 ◽

Cited By ~ 1

Author(s):

Mohammad Mohammad Beigi Kasvaei ◽

◽

Mohammad Hossein Kazeminezhad ◽

Abbas Yeganeh-Bakhtiary ◽

◽

...

Keyword(s):

Vortex Dynamics ◽

Hydrodynamic Force ◽

Numerical Study ◽

Wave Induced

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Wave-induced stresses and pore pressures in sloping seabeds

International Journal for Numerical and Analytical Methods in Geomechanics ◽

10.1002/nag.1610150505 ◽

1991 ◽

Vol 15 (5) ◽

pp. 355-373 ◽

Cited By ~ 3

Author(s):

Behrouz Gatmiri

Keyword(s):

Pore Pressures ◽

Induced Stresses ◽

Wave Induced

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Numerical study on wave-induced hydro-elastic responses of a floating raft for aquaculture

Ocean Engineering ◽

10.1016/j.oceaneng.2021.109869 ◽

2021 ◽

Vol 240 ◽

pp. 109869

Author(s):

Bei Chu ◽

Yiren Chen ◽

Yao Zhang ◽

Guangming Zhang ◽

Xu Xiang ◽

...

Keyword(s):

Numerical Study ◽

Floating Raft ◽

Elastic Responses ◽

Wave Induced

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3-Dimensional numerical study of wave-induced seabed response around three different types of wind turbine pile foundations

SN Applied Sciences ◽

10.1007/s42452-019-1484-2 ◽

2019 ◽

Vol 1 (11) ◽

Cited By ~ 1

Author(s):

Richard Asumadu ◽

Jisheng Zhang ◽

H. Y. Zhao ◽

Hubert Osei-Wusuansa ◽

Alex Baffour Akoto

Keyword(s):

Wind Turbine ◽

Numerical Study ◽

Pile Foundations ◽

3 Dimensional ◽

Different Types ◽

Wave Induced

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Experimental and Numerical Study on Hydromechanical Coupled Deformation Behavior of Beishan Granite considering Permeability Evolution

Geofluids ◽

10.1155/2020/8855439 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

Z. H. Wang ◽

W. G. Ren ◽

Y. L. Tan ◽

Heinz Konietzky

Keyword(s):

Pressure Difference ◽

Numerical Study ◽

Volumetric Strain ◽

Initial Pressure ◽

Numerical Code ◽

Permeability Evolution ◽

Beishan Granite ◽

Pore Pressures ◽

Damaged Zone ◽

Hlw Repository

Beishan granite is a potential host rock for a high-level radioactive waste (HLW) repository in China. Understanding the hydromechanical (HM) behavior and permeability evolution of Beishan granite is important for the HLW repository safety. Therefore, the granite of Beishan in Gansu province was studied. HM coupled tests are carried out on Beishan granite under different pore pressures. The results show that the initial pressure difference has little influence on permeability measurement before dilatancy starts. However, after onset of dilatancy, the permeability increases with the increasing initial pressure difference. The initial permeability of Beishan granite is about 10−18 m2 under a confining pressure of 20 MPa. In the initial loading phase, the permeability shows a relatively large reduction. Then, the permeability almost keeps constant until dilatancy starts. From dilatancy point to peak stress, permeability increases linearly with volumetric strain. The proposed permeability evolution rule is implemented into a numerical code to perform HM coupled simulations. The simulation results show that the damaged zone first appears at the model boundary and then extends to the inside, forming high volumetric strain areas. And it provides seepage channels for fluid flow. The macroscopic fracture patterns indicate that pore pressure accelerates rock degradation during HM coupling. The obtained results help to understand the damage mechanisms of granite caused by pore pressures and are of great importance for the safety of a HLW repository.

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Numerical Study on Seakeeping Performance of a Damaged Ship

Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology ◽

10.1115/omae2019-96193 ◽

2019 ◽

Author(s):

Lu-Ning Cui ◽

Yi Zheng ◽

Yinggang Li ◽

Ling Zhu ◽

Mingsheng Chen

Keyword(s):

Numerical Study ◽

Rolling Motion ◽

Wave Direction ◽

Regular Waves ◽

Motion Responses ◽

Seakeeping Performance ◽

Property Losses ◽

Hull Damage ◽

Wave Induced ◽

Damaged Ship

Abstract Ships sailing in the sea may encounter collision, grounding or projectile impacting accidents, which may cause hull damage and subsequent compartment flooding. Due to the effect of the flooding water induced moment and the restoring moment, the damaged ship may have inclination and rolling motion. When the inclination or the rolling motion is too large, it may affect the safety and survivability of ship in navigation and cause severe casualties and property losses. In order to increase the navigation safety and survivability of the damaged ship, a numerical model is established based on the potential flow theory to investigate the seakeeping performance of the damaged ship in two scenarios, i.e., the case before ship damaged, and the case when the damaged ship reaching a relatively stable floating state. The heave, pitch and roll motion responses and corresponding wave-induced loads acting on the ship are analyzed in regular waves. In addition, the effects of the navigation speed and the wave direction on the seakeeping performance are also investigated.

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