On the Coupling of Incompressible SPH with a Finite Element Potential Flow Solver for Nonlinear Free-Surface Flows

Fourtakas, Georgios; Stansby, Peter; Rogers, Benedict D.; Lind, Steven; Yan, Shiqiang; Wang, Qingwei

doi:10.17736/ijope.2018.ak28

Cited by 18 publications

(9 citation statements)

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“…the wave propagation away from the structures, the effective FNPT models are employed. Typical examples include the coupling of the FNPT with commercial software (Yan and Ma, 2010b;Hildebrandt and Sriram, 2014), with the single-phase MLPG-R (Sriram et al, 2014; or SPH (Fourtakas et al, 2018), and with OpenFOAM (Li et al, 2018), which were developed based on the domaindecomposition strategy. It is worth noting that hybrid models using the velocity-decomposition strategy have also been developed to tackle the challenges in the WSIs (Edmund et al, 2013;Ferrant et al, 2003Ferrant et al, , 2008Luquet et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Investigation of interaction between extreme waves and a moored FPSO using FNPT and CFD solvers

Yan

Greaves

et al. 2020

Ocean Engineering

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To assess the survivability of marine structures, numerical tools that can predict the interaction between extreme waves and structures are needed. Considering the significant nonlinearity associated with the problem, fully nonlinear models, including the fully nonlinear potential theory (FNPT) and general viscous flow theory based on the Navier-Stokes equation (NS) and Continuity equation, are necessary for a reliable prediction. Both methods have relatively higher computational cost compared to the linear or second order wave theories, which are popular in routine design practices. Although the FNPT model generally requires less computational efforts compared to the NS model, its theoretical assumption, i.e. the flow is incompressible, irrotational and inviscid, invalidates its applications to those problems with significant viscous effects and/or breaking waves. It is, therefore, necessary to conduct a comparative study on the accuracy of the FNPT in various problems to quantify its range of application. In this paper, both the Quasi Arbitrary Lagrangian Eulerian Finite Element (QALE-FEM) method based on the FNPT model and the open source Reynolds Average Navier-Stoke (RANS) based code, OpenFOAM, are used to predict the interaction between extreme waves and a moored Floating Production Storage and Offloading (FPSO) model. The extreme waves are generated using the NewWave theory and different wave steepnesses are used. The results, including the wave runup, pressure and force on the FPSO, are compared with the corresponding experimental data obtained from the ocean basin at the COAST Laboratory, University of Plymouth. Satisfactory agreement between the numerical predictions and the experimental measurements are observed. It is also concluded that the differences between the QALE-FEM results and the OpenFOAM results are mainly caused by the effectiveness of the wave generation in the corresponding simulations; the viscous effects may be considerable in the rotational motion of the FPSO when subjected to extreme waves.

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Section: Introductionmentioning

confidence: 99%

Investigation of interaction between extreme waves and a moored FPSO using FNPT and CFD solvers

Yan

Greaves

et al. 2020

Ocean Engineering

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“…the velocity-decomposition (Edmond et al, 2013), spacesplitting /domain-decomposition (e.g. Colicchio et al, 2006;Yan and Ma, 2010a;Hildebrandt et al, 2013;Sriram et al 2014;Fourtakas et al 2017;Li et al 2018;Zhang et al 2020) and time-splitting approaches (e.g. Wang et al, 2018) have been attempted.…”

Section: Introductionmentioning

confidence: 99%

Modelling of focused wave interaction with wave energy converter models using qaleFOAM

Wang

Yan

et al. 2020

Proceedings of the Institution of Civil Engineers - Engineering

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The paper presents a numerical investigation of the interaction between focused waves and wave energy converter (WEC) models using a hybrid solver, qaleFOAM, which couples a two-phase incompressible Navier-Stokes (NS) solver OpenFOAM/InterDyMFoam with the Quasi Lagrangian-Eulerian Finite Element Method (QALE-FEM) based on the fully nonlinear potential theory (FNPT) using the domaindecomposition approach. In the qaleFOAM, the NS solver deals with a small region near the structures (NS domain), where the viscous effect may be significant; the QALE-FEM covers the remaining computational domain (FNPT domain); an overlap (transitional) zone is applied between two domains. The WEC models, mooring system and the wave conditions are specified by the CCP-WSI (Collaborative Computational Project in Wave-Structure Interaction) Blind Test Series 2. In the numerical simulation, the incident wave is generated in the FNPT domain using a self-correction wavemaker and propagates into the NS domain through the coupling boundaries and attached transitional zones. An improved passive wave absorber is imposed at the outlet of the NS domain for wave absorption. The practical performance of the qaleFOAM is demonstrated by comparing its prediction with the experimental data, including the wave elevation, motion responses (surge, heave and pitch) and mooring load.

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“…Ferrant et al, 2003;Luquet et al, 2007, Ferrant et al, 2008Edmund et al, 2013) and the domain-decomposition (e.g. Yan and Ma 2010;Hildebrandt et al, 2013;Sriram et al, 2014;Fourtakas et al, 2017;Higuera et al, 2018; have been developed. Systematic reviews on the development of the hybrid models can be found in Sriram et al, (2014) and .…”

Section: Introductionmentioning

confidence: 99%

Comparative Numerical Study on Focusing Wave Interaction with FPSO-like Structure

Yan¹,

Li²,

Wang³

et al. 2019

IJOPE

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Evaluating the interactions between offshore structures and extreme waves plays an essential role for securing the survivability of the structures. For this purpose, various numerical tools, e.g. the fully nonlinear potential theory (FNPT), the Navier-Stokes (NS) models and hybrid approaches combining different numerical models, have been developed and ultilised. However, there is still a great uncertainty over the required level of model fidelity when being applied to a wide range of wave-structure interaction problems. This paper aims to shed some light on this issue with a specific focus on the overall error sourced from wave generation/absorbing techniques and resolving the viscous and turbulent effects, by comparing the performances of three different models, including the quasi Arbitrary Lagrangian Eulerian Finite Element Method (QALE-FEM) based on the FNPT, an in-house two-phase NS model with large-eddy simulation(LES) and a hybrid model coupling the QALE-FEM with the OpenFOAM/InterDymFoam, in the cases with a fixed FPSO-like structure in extreme focusing waves. The relative errors of numerical models are defined against the experimental data, which are released after the numerical works have been completed (i.e. a blind test), in terms of the pressure and wave elevation. It provides a practical reference for not only choosing an appropriate model in practices but also on developing/optimizing numerical tools for more reliable and robust predications.

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On the Coupling of Incompressible SPH with a Finite Element Potential Flow Solver for Nonlinear Free-Surface Flows

Cited by 18 publications

References 0 publications

Investigation of interaction between extreme waves and a moored FPSO using FNPT and CFD solvers

Investigation of interaction between extreme waves and a moored FPSO using FNPT and CFD solvers

Modelling of focused wave interaction with wave energy converter models using qaleFOAM

Comparative Numerical Study on Focusing Wave Interaction with FPSO-like Structure

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