A numerical hydro-geotechnical model for marine gravity structures

Elsafti, Hisham; Oumeraci, Hocine

doi:10.1016/j.compgeo.2016.05.025

Cited by 30 publications

(11 citation statements)

References 38 publications

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“…Note that, this study obtainedẇ i (velocity of pore water) (20) from (2) (seepage equilibrium equation) and combine it with (3) (Mass continuous equation), thus all the gradient terms are separated out (see the underlined for k and E) in the governing Equations (21)- (27). Equations (20) and (27) are newly proposed in this study. Comparing to the previous studies, this study provide a approach to separate out all the gradient terms in the 3D dynamic response equations of the elastic porous seabed medium.…”

Section: Seabed Modelmentioning

confidence: 98%

“…Liao et al [14] and Tong et al [15] considered the effect of currents on the wave-induced seabed response, and Chen et al [16] studied the nonlinear wave-induced response of an anisotropic seabed. Similar studies have been conducted to investigate the seabed response around marine structures, such as pipelines [17], composite breakwaters [18][19][20][21][22], and mono-piles [23,24]. All these studies have assumed a homogeneous seabed that adopts constant soil parameters in space.…”

Section: Introductionmentioning

confidence: 99%

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

Sui

Wang

et al. 2019

JMSE

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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.

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Section: Seabed Modelmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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

Sui

Wang

et al. 2019

JMSE

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“…The Weller et al [18] and Jasak and Weller [28] implementations form a component of the opensource C++ library OpenFOAM (formerly commercial software FOAM). Many of the subsequent Submitted for review (0000) THIRTY YEARS OF THE FINITE VOLUME METHOD FOR SOLID MECHANICS 9 developments in the implicit cell-centred field have been based on the OpenFOAM platform, for example, [77,78,88,94,98,104,115,118,119,121,142,466]. It should, however, be noted that the standard cell-centred form of the finite volume method is not the only approach that has built on the OpenFOAM library; Godunov-type methods, for example, have been implemented by Haider et al [370,372]; these are discussed later.…”

Section: "Standard" Cell-centred Approachesmentioning

confidence: 99%

Thirty years of the finite volume method for solid mechanics

Cardiff,

Demirdžić

2018

Preprint

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Since early publications in the late 1980s and early 1990s, the finite volume method has been shown suitable for solid mechanics analyses. At present, there are several flavours of the method, including "cell-centred", "staggered", "vertex-centred", "periodic heterogenous microstructural", "Godunov-type", "matrix-free", "meshless", as well as others. This article gives an overview, historical perspective, comparison and critical analysis of the different approaches, including their relative strengths, weaknesses, similarities and dissimilarities, where a close comparison with the de facto standard for computational solid mechanics, the finite element method, is given. The article finishes with a look towards future research directions and steps required for finite volume solid mechanics to achieve widespread acceptance.

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“…The quasi-static anisotropic poro-elastic solver by Tang et al (2014) was validated and applied in the work of Li et al (2018) in which the anisotropic consideration was proved to be practical for modeling the seabed of medium and coarse sand. Elsafti and Oumeraci (2016) developed a hydro-geotechnical solver named geotechFoam to model the soil-structure interaction around the marine gravity structures, including a multi-yield surface plasticity model to simulate plastic soil response under cyclic loads. The soil constitutive model for simulating plastic deformations and two-dimensional wave loading on the elastic seabed without a structure has been validated in their work.…”

Section: Introductionmentioning

confidence: 99%

A numerical toolbox for wave-induced seabed response analysis around marine structures in the OpenFOAM® framework

Ong

Tang

2020

Ocean Engineering

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An open-source numerical toolbox for modeling the porous seabed interaction with waves and structures is implemented in the finite-volume-method (FVM) based OpenFOAM ® framework. The toolbox includes a soil consolidation model, a wave-structure-seabed interaction (WSSI) model, and the liquefaction assessment module. In the present work, one-way coupling algorithm is applied for the WSSI analysis. The coupling effect between different physical domains is achieved by time-varying data mapping via the common boundaries. The consolidation model is governed by the quasi-static Biot's equations and is verified against the theoretical solution for the Terzaghi's classical consolidation test. The anisotropic wave-induced porous seabed response model is governed by the Biot's equations in the partial-dynamic form, i.e. u p approximation form, to achieve a good efficiency and accuracy. The FVM-based u p model is validated against the existing experimental data of standing wave-induced seabed response near a vertical wall. The integrated WSSI model is validated against existing experiment of wave-soil-pile interaction with wave data and soil response data. Good agreement is obtained. Two case studies are performed using the present numerical toolbox. The first case is an investigation of two-dimensional (2D) nonlinear wave-seabed interaction. The second case is a three-dimensional (3D) parametric study of wave-induced seabed response analysis around gravity-based offshore foundations with various designs. The 3D parametric study follows the sequence of consolidation analysis, WSSI analysis and liquefaction assessment. Two types of liquefaction criteria are implemented and compared in the present study. The toolbox is made publicly available through the foam-extend community.

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A numerical hydro-geotechnical model for marine gravity structures

Cited by 30 publications

References 38 publications

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

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

Thirty years of the finite volume method for solid mechanics

A numerical toolbox for wave-induced seabed response analysis around marine structures in the OpenFOAM® framework

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