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On systematic development of FSI solvers in the context of particle methods

Journal of Hydrodynamics 2022年第3期34卷 395-407页

作者： Abbas Khayyer hitoshi gotoh Yuma Shimizu Department of Civil and Earth Resources Engineering Kyoto UniversityKyotoJapan

This paper presents a review on state-of-the-art of developments corresponding to fluid-structure interaction(FSI)solvers developed within the context of particle methods.The paper reviews and highlights the potential robustness of entirely Lagrangian meshfree FSI solvers in reproducing FSI corresponding to extreme events and portrays the future perspectives for systematic developments towards reliable engineering applications with respect to rapid advances in technology and emergence of so-called advanced materials that can result in complex and highly non-linear structural responses.Accordingly,the paper highlights the necessity for reproduction of comprehensive structural responses,including viscoelastic,elastoplastic and progressive damages/failures,by the advanced FSI solvers developed within the context of particle methods.In this regard,extensions of the structure model are suggested to be conducted in a variationally consistent framework to ensure stability,accuracy and physical reliability including thermodynamic consistency.The paper reviews basics of mathematical and numerical modelling for entirely Lagrangian meshfree hydroelastic FSI solvers and presents a brief background on extensions of such solvers towards reproducing viscoelastic structural responses.Some preliminary numerical results on structural viscoelasticity achieved by an extended Hamiltonian SPH(HSPH)model are presented.This vision paper also concisely portrays the future perspectives for systematic development of particle-based FSI solvers.

关键词： Fluid-structure interaction(FSI) entirely Lagrangian meshfree smoothed particle hydrodynamics(SPH) Hamiltonian SPH(HSPH) viscoelasticity

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Towards development of enhanced fully-Lagrangian mesh-free computational methods for fluid-structure interaction

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Journal of Hydrodynamics 2018年第1期30卷 49-61页

作者： Abbas Khayyer hitoshi gotoh Hosein Falahaty Yuma Shimizu Department of Civil and Earth Resources Engineering Kyoto UniversityKatsura Campus

Simulation of incompressible fluid flow-elastic structure interactions is targeted by using fully-Lagrangian mesh-free computational methods. A projection-based fluid model（moving particle semi-implicit（MPS）） is coupled with either a Newtonian or a Hamiltonian Lagrangian structure model（MPS or HMPS） in a mathematically-physically consistent manner. The fluid model is founded on the solution of Navier-Stokes and continuity equations. The structure models are configured either in the framework of Newtonian mechanics on the basis of conservation of linear and angular momenta, or Hamiltonian mechanics on the basis of variational principle for incompressible elastodynamics. A set of enhanced schemes are incorporated for projection-based fluid model（Enhanced MPS）, thus, the developed coupled solvers for fluid structure interaction（FSI） are referred to as Enhanced MPS-MPS and Enhanced MPS-HMPS. Besides, two smoothed particle hydrodynamics（SPH）-based FSI solvers, being developed by the authors, are considered and their potential applicability and comparable performance are briefly discussed in comparison with MPS-based FSI solvers. The SPH-based FSI solvers are established through coupling of projection-based incompressible SPH（ISPH） fluid model and SPH-based Newtonian/Hamiltonian structure models, leading to Enhanced ISPH-SPH and Enhanced ISPH-HSPH. A comparative study is carried out on the performances of the FSI solvers through a set of benchmark tests, including hydrostatic water column on an elastic plate,high speed impact of an elastic aluminum beam, hydroelastic slamming of a marine panel and dam break with elastic gate.

关键词： Fluid structure interaction（FSI） projection-based method moving particle semi-implicit incompressible smoothed particle hydrodynamics（ISPH） Hamiltonian MPS（HMPS） Hamiltonian SPH（HSPH）

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Incompressible SPH simulation of solitary wave propagation on permeable beaches

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Journal of Hydrodynamics 2020年第4期32卷 664-671页

作者： Chiaki Tsurudome Dongfang Liang Yuma Shimizu Abbas Khayyer hitoshi gotoh Department of Engineering University of CambridgeTrumpington StreetCambridgeUK Graduate School of Engineering Kyoto UniversityKyotoJapan

Wave propagation on uniformly sloped beaches is a canonical coastal engineering topic that has been studied extensively in the past few decades.However,most of these studies treat beaches as solid boundaries even though they are often made of porous materials,such as sediment and vegetation.Permeable beaches struck by tsunami-like waves have not been adequately investigated.It is expected that the degree of penneability plays a crucial role in mitigating the impact of the wave.This study examines solitary wave run-ups on sandy beaches using an incompressible smoothed particle hydrodynamics(ISPH)model.The permeability of the beach is considered to be directly related to the diameter of its constituent sand particles.To obtain a satisfactory pressure field,which cannot be achieved using the original ISPH algorithm,the source term of the pressure Poisson equation has been modified based on a higher-order source-term expression.Flows within the porous medium are computed in the same framework as those outside the porous medium.In the current model,no transition zone is needed at the boundary of the porous structure.The wave-attenuation effect of the porous medium is discussed,with a particular focus on the relationship between the mn-up height and grainsize.

关键词： Solitary wave porosity incompressible smoothed particle hydrodynamics(ISPH) run-up

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SELECTIVE NEURITE OUTGROWTH ON SILVER NEGATIVE ION (Ag^- )-IMPLANTED POLYSTYRENE SURFACES

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Chinese Journal of Polymer Science 2004年第1期22卷 69-75页

作者： Hiroko Satoa Hiroshi Tsuji hitoshi Sasaki Shinichi Ikemura Yasuhito gotoh Junzo Ishikawa Sei-ichi Nishimoto Departments of Polymer Chemistry Graduate School of Engineering Kyoto University Katsura Kyoto 615-8510 JapanElectroinic Science and Engineering Graduate School of Engineering Kyoto University Katsura Kyoto 615-8510 JapanElectroinic Science and Engineering Graduate School of Engineering Kyoto University Katsura Kyoto 615-8510 JapanElectroinic Science and Engineering Graduate School of Engineering Kyoto University Katsura Kyoto 615-8510 JapanElectroinic Science and Engineering Graduate School of Engineering Kyoto University Katsura Kyoto 615-8510 JapanElectroinic Science and Engineering Graduate School of Engineering Kyoto University Katsura Kyoto 615-8510 JapanEnergy and Hydrocarbon Chemistry Graduate School of Engineering Kyoto University Katsura Kyoto 615-8510 Japan

The negative ion implantation technique was applied to modify polymer surfaces of culture dishes for neuronal cells, PC12h. The silver negative ion (Ag-)-implantation was carried out at an ion energy of 20 keV and a dose of 3 × 1015 ions/cm2 with non-treated polystyrene (NTPS), tissue culture polystyrene (TCPS), and collagen-coated TCPS-Iwaki (CCPS). Ag--implanted surfaces of Ag/NTPS, Ag/TCPS, and Ag/CCPS were studied with respect to contact angle and/or chemical composition. The numerical values of contact angles on Ag/NTPS and Ag/TCPS were similar within experimental error, indicating the resemblance in their hydrophobicity and hydrophilicity. The PC12h cells, however, were attached only to the Ag--implanted region of NTPS, but not to the non-implanted NTPS region. Moreover, the neurite outgrowth was also observed to extend specifically along the Ag--implanted region of NTPS but not on the non-implanted NTPS region, although neurites extended towards all directions on collagen-coated TCPS as a control surface. There was no remarkable difference in neurite outgrowth among Ag--implanted regions of TCPS and CCPS. Thus Ag/NTPS region was affirmed to promote highly selective attachment, growth, and differentiation of PC12h cells, although its mechanism is still unknown.

关键词： Ag--implanted polystyrene Contact angle Collagen Neuronal cells

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