Mechanical Systems Mechanical Systems 49EngineeringEngineeringInturbulence,three-dimensionalandtangleddisturbancesarealternatingceaselessly.OurcurrentchallengeistoelucidatecoherentstructuresinturbulentshearflowsbymeansofaMEMSmicrophonearrayandhotwireanemometrythatcancaptureastreakstructurenearthewallaswellashair-pinvortices.Inaddition,‘laminar-turbulenttransition,’whichonecanregardasembryologyofturbulence,isalsoinvestigatedusingflakeparticlesandahigh-powerlasersheet.Ourlaboratoryaimsatunderstandingmaterialpropertiesandphenomenafromelectronicandatomiclevels.Ourstudiesdevelopcomputationaldesignofadvancedmaterialsbyutilizingstate-of-the-artcomputers,andinventinnovativetechnologiesforenergy-savingandsustainable.Currentresearchtopicsare(i)deformationmechanismandfirst-principlesdesignofMgalloys,(ii)hetero-interfaceanalysisformulti-materialproducts,and(iii)atomisticdynamicsanalysisofsurfacereactionandthinfilmgrowth.Materialsconsistofelectronsandnucleus.Basedonquantummechanicsdescribingtheirstates,20th-centurycondensedmatterphysicspromotesanunderstandingofvariousphenomena.However,itisstillachallengingproblemtolinkmicroscopicbehaviortomacroscopicproperties.Westudymaterialpropertiesfromthemulti-scaleviewpoint,towardafuturemanufacturingtechnologytodesignnewmaterialsfromelectronicandatomiclevels.‘Turbulence’isanold,butnewproblem.Itisoneofthemostfundamentalsubjectsthatpersistsfromthe20thcentury.Researcherallovertheworldaretryingtounderstand“turbulence”usingsupercomputersandover-100-meterwindtunnelfacilitiesintherecentyears.Inordertoapproachtheessenceofaturbulentflow,weparticipateintheinternationalresearchCICLoPEandwesharethegiganticpipeflowfacility.Inourfluiddynamicsexperiments,wemeasuretheflowfieldsusingandcontrollingmanykindsofopticalandacousticdevicesaswellasstandardanemometers.Ourgraduateswithsuchexperiencesarehighlyactiveinthedevelopmentoffluidmachineries.jointMolecular dynamics simulations of deformation twinning of Mg and first-principles calculations of effects of alloying elementsInterfacial bonding and atomic configuration of metal-oxide hetero-interface by first-principles calculationsArray of MEMS micro sensors. Spanwiseintervals are 0.8 mm and a diameter of a hole is 0.5 mm. A hot wire at the left end of the array has a2.5 mm diameter sensor.Flow visualization of laminar-turbulence intermittent flow. Flake-suspended water flows between glass plates apart 7 mm.Daisuke MatsunakaProfessorResearcharea:Computational materials science, Solid mechanics, Theoretical condensed matterProfessorPostdoctoral in KTH(Stockholm) and Tohoku Univ.The current title from 2014. His main interest is turbulence in his main resercharea, fluid dynamics.MasaharuMatsubaraIn the FutureAfter GraduationAllmembersinourlaboratoryarepromisingcandidatesofresearcherandengineerdevelopingnewmaterialsandutilizingmaterialsforfunctionalproducts,duetotheirskillsandknowledgeacquiredthroughresearchactivities.In the FutureAfter GraduationMulti-scale Modeling of Mechanical Behavior and Materials Design from Electronic and Atomic LevelsCapturing ‘Coherent Structures’ in Turbulence by MEMS Sensors
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