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A recursive implementation of the ALIENOR optimization method

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International Journal of Intelligent Computing and Cybernetics 2021年第2期14卷 81-103页

作者： Daniele peri National Research Council(CNR) Istituto per le Applicazioni del Calcolo“Mauro Picone”–IACRomaItaly

Purpose-A recursive scheme for the ALIENOR method is proposed as a remedy for the difficulties induced by the method.A progressive focusing on the most promising region,in combination with a variation of the density of the alpha-dense curve,is ***/methodology/approach-ALIENOR method is aimed at reducing the space dimensions of an optimization problem by spanning it by using a single alpha-dense curve:the curvilinear abscissa along the curve becomes the only design parameter for any design *** a counterpart,the transformation of the objective function in the projected space is much more difficult to ***-A fine tuning of the procedure has been performed in order to identity the correct balance between the different elements of the *** proposed approach has been tested by using a set of algebraic functions with up to 1,024 design variables,demonstrating the ability of the method in solving large scale optimization *** an industrial application is ***/value-In the knowledge of the author there is not a similar paper in the current literature.

关键词： ALIENOR optimization Global optimization Lipschitzian optimization Reduced order base

COEXISTENCE FOR mULTIPle LARGEST REPRODUCTION RATIOS OF A mULTI-STRAIN SIS EPIDEmIC mOdel

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Acta mathematica Scientia 2016年第5期36卷 1524-1530页

作者： Yoshiaki mUROYA Eleonora mESSINA Elvira RUSSO Antonia VECCHIO Department of mathematics Waseda University Dipartimento di matematica e applicazioni Università degli Studi di Napoli "Federico Ⅱ"-Via Cintia istituto per applicazioni del calcolo "m. picone" Sede di Napoli-CNR-Via P.Castellino

In this paper, to complete the global dynamics of a multi-strains SIS epidemic model, we establish a precise result on coexistence for the cases of the partial and complete duplicated multiple largest reproduction rat... 详细信息

关键词： multi-strains SIS epidemic model global attractivity Lyapunov function coexistence

On Spiral Waves Arising in Natural Systems

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Communications in Computational Physics 2010年第8期8卷 610-622页

作者： D.Bini C.Cherubini S.Filippi A.Gizzi P.E.Ricci istituto per le applicazioni del calcolo“m.picone” CNR I-00161 RomeItaly International Center for Relativistic Astrophysics-I.C.R.A. University of Rome“La Sapienza”I-00185 RomeItaly Nonlinear Physics and mathematical modeling Lab Faculty of EngineeringUniversity Campus Bio-MedicoI-00128 RomeItaly Alberto Sordi Foundation-Research Institute on Aging I-00128 RomeItaly mathematics Department University of Rome“La Sapienza”I-00185 RomeItaly

Spiral waves appear in many different natural contexts:excitable biological tissues,fungi and amoebae colonies,chemical reactions,growing crystals,fluids and gas eddies as well as in *** the existing theories explain the presence of spirals in terms of nonlinear parabolic equations,it is explored here the fact that selfsustained spiral wave regime is already present in the linear heat operator,in terms of integer Bessel functions of complex *** solutions,even if commonly not discussed in the literature because diverging at spatial infinity,play a central role in the understanding of the universality of spiral *** particular,we have studied how in nonlinear reaction-diffusion models the linear part of the equations determines the wave front appearance while nonlinearities are mandatory to cancel out the blowup of *** spiral wave pattern still requires however at least two cross-reacting species to be physically *** implications of such a results are discussed.

关键词： Reaction-diffusion equations biophysics crystal growth heat transfer

The Stability of the Gauss-Laguerre Rule for Cauchy P.V. Integrals on the Half Line

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American Journal of Computational mathematics 2023年第4期13卷 505-511页

作者： maria Rosaria Capobianco Giuliana Criscuolo istituto per le applicazioni del calcolo “mauro picone”—CNR Napoli Italy Dipartimento di matematica e applicazioni Università degli Studi di Napoli “Federico II” Napoli Italy

In this paper, the authors give a different and more precise analysis of the stability of the classical Gauss-Laguerre quadrature rule for the Cauchy P.V. integrals on the half line. moreover, in order to obtain this result they give some new estimates for the distance of the zeros of the Laguerre polynomials that can be useful also in other contests.

关键词： Gauss Quadrature Exponential Weights Cauchy P.V. Integrals Stability

A Quantitative Comparison of Physical Accuracy and Numerical Stability of Lattice Boltzmann Color Gradient and Pseudopotential multicomponent models for microfluidic Applications

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Communications in Computational Physics 2022年第7期32卷 450-489页

作者： Karun P.N.Datadien Gianluca Di Staso Herman m.A.Wijshoff Federico Toschi Department of Applied Physics Eindhoven University of Technology5612 AZ EindhovenNetherlands FLOW matters Consultancy B.V. 5612AEEindhovenThe Netherlands Department of mechanical Engineering Eindhoven University of Technology5612 AZ EindhovenNetherlands Canon Production Printing Netherlands B.V. 5914 HHVenloThe Netherlands Department of mathematics and Computer Science Eindhoven University of Technology5612 AZ EindhovenNetherlands istituto per le applicazioni del calcolo Consiglio Nazionale delle Ricerche00185 RomeItaly

The performances of the Color-Gradient(CG)and the Shan-Chen(SC)multicomponent Lattice Boltzmann models are quantitatively compared side-by-side on multiple physical flow problems where breakup,coalescence and contraction of fluid ligaments are *** flow problems are relevant to microfluidic applications,jetting of microdroplets as seen in inkjet printing,as well as emulsion dynamics.A significantly wider range of parameters is shown to be accessible for CG in terms of density-ratio,viscosity-ratio and surface tension *** stability for a high density ratio O(1000)is required for simulating the drop formation process during inkjet printing which we show here to be achievable using the CG model but not using the SC *** results show that the CG model is a suitable choice for challenging simulations of droplet formation,due to a combination of both numerical stability and physical *** also present a novel approach to incorporate repulsion forces between interfaces for CG,with possible applications to the study of stabilized ***,we show that the CG model can produce similar results to a known multirange potentials extension of the SC model for modelling a disjoining pressure,opening up its use for the study of dense stabilized emulsions.

关键词： Lattice Boltzmann method multiphase flow multicomponent flow inkjet printing turbulent emulsion

A Review on Contact and Collision methods for multi-Body Hydrodynamic Problems in Complex Flows

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Communications in Computational Physics 2022年第9期32卷 899-950页

作者： S.Karimnejad A.Amiri delouei H.Basagaoglu m.Nazari m.Shahmardan G.Falcucci m.Lauricella S.Succi Faculty of mechanical Engineering Shahrood University of TechnologyShahroodIran Department of mechanical Engineering University of BojnordBojnordIran Evolution Online LLC San AntonioTX 78292USA Department of Enterprise Engineering“mario Lucertini” University of Rome“Tor Vergata”Via del Politecnico 100133 RomeItaly Department of Physics Harvard University29 Oxford StreetCambridgeMA 02138USA istituto per le applicazioni del calcolo Consiglio Nazionale delle RicercheVia dei Taurini 1900185RomeItaly Center for Life Nanoscience Italian Institute of TechnologyViale ReginaMargherita 29500161RomeItaly

modeling and direct numerical simulation of particle-laden flows have a tremendous variety of applications in science and engineering across a vast spectrum of scales from pollution dispersion in the atmosphere,to fluidization in the combustion process,to aerosol deposition in spray medication,along with many *** to their strongly nonlinear and multiscale nature,the above complex phenomena still raise a very steep challenge to themost *** this review,we provide comprehensive coverage of multibody hydrodynamic(mBH)problems focusing on particulate suspensions in complex fluidic systems that have been simulated using hybrid Eulerian-Lagrangian particulate flow *** these hybridmodels,the Immersed Boundary-Lattice Boltzmann method(IB-LBm)provides mathematically simple and computationally-efficient algorithms for solid-fluid hydrodynamic interactions in mBH *** paper elaborates on the mathematical framework,applicability,and limitations of various’simple to complex’representations of closecontact interparticle interactions and collision methods,including short-range interparticle and particle-wall steric interactions,spring and lubrication forces,normal and oblique collisions,and mesoscale molecular models for deformable particle collisions based on hard-sphere and soft-sphere models in mBH models to simulate settling or flow of nonuniform particles of different geometric shapes and sizes in diverse fluidic systems.

关键词： Particulate flow collision close-contact interaction immersed boundary method lattice Boltzmann method

Comparison of Lattice Boltzmann,Finite Element and Volume of Fluid multicomponent methods for microfluidic Flow Problems and the Jetting of microdroplets

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Communications in Computational Physics 2023年第3期33卷 912-936页

作者： Karun P.N.Datadien Gianluca Di Staso Christian Diddens Herman m.A.Wijshoff Federico Toschi Department of Applied Physics and Science Education Eindhoven University of Technology5600MB EindhovenNetherlands FLOW matters Consultancy B.V. 5612AEEindhovenThe Netherlands Physics of Fluids group Department of Science and TechnologyMesa+InstituteMax Planck Center for Complex Fluid Dynamics and J.M.Burgers Centre for Fluid DynamicsUniversity of TwenteP.O.Box 2177500 AE EnschedeThe Netherlands Canon Production Printing Netherlands B.V. 5914 HHVenloThe Netherlands Department of mathematics and Computer Science Eindhoven University of Technology5600MB EindhovenNetherlands istituto per le applicazioni del calcolo Consiglio Nazionale delle Ricerche00185 RomeItaly.

We show that the lattice Boltzmann method(LBm)based color-gradient model with a central moments formulation(CG-Cm)is capable of accurately simulating the droplet-on-demand inkjetting process on a micrometer length scale by comparing it to the Arbitrary Lagrangian Eulerian Finite Element method(Ale-FEm).A full jetting cycle is simulated using both CG-Cm and Ale-FEmand results are quantitatively compared by measuring the ejected ink velocity,volume and contraction *** also show that the individual relevant physical phenomena are accurately captured by considering three test-cases;droplet oscillation,ligament contraction and capillary *** first two cases test accuracy for a dynamic system where surface tension is the driving force and the third case is designed to test wetting boundary *** the first two cases we also compare the CG-Cm and Ale-FEm results to Volume of Fluid(VOF)*** of the three methods shows close agreement when compared to each other and analytical solutions,where *** we demonstrate that asymmetric jetting is achievable using 3D CG-Cm simulations utilizing asymmetric wetting conditions inside the *** allows for systematic investigation into the physics of asymmetric jetting,*** to jet-nozzle manufacturing imperfections or due to other disturbances.

关键词： Lattice Boltzmann method multiphase flow multicomponent flow inkjet printing