工学部_研究紹介_2020_英語版
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Inturbulence,three-dimensionalandtangleddisturbancesarealternatingceaselessly.OurcurrentchallengeistoelucidatecoherentstructuresinturbulentshearflowsbymeansofaMEMSmicrophonearrayandhotwireanemometrythatcancaptureastreakstructurenearthewallaswellashair-pinvortices.Inaddition,‘laminar-turbulenttransition,’whichonecanregardasembryologyofturbulence,isalsoinvestigatedusingflakeparticlesandahigh-powerlasersheet.‘Turbulence’isanold,butnewproblem.Itisoneofthemostfundamentalsubjectsthatpersistsfromthe20thcentury.Researcherallovertheworldaretryingtounderstand“turbulence”usingsupercomputersandover-100-meterwindtunnelfacilitiesintherecentyears.Inordertoapproachtheessenceofaturbulentflow,weparticipateintheinternationaljointresearchCICLoPEandwesharethegiganticpipeflowfacility.ProfessorPostdoctoral in KTH(Stockholm) and Tohoku Univ.The current title from 2014. His main interest is turbulence in his main resercharea, fluid dynamics.Array 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.Capturing ‘Coherent Structures’ in Turbulence by MEMS SensorsFlow visualization of laminar-turbulence intermittent flow. Flake-suspended water flows between glass plates apart 7 mm.Inourfluiddynamicsexperiments,wemeasuretheflowfieldsusingandcontrollingmanykindsofopticalandacousticdevicesaswellasstandardanemometers.Ourgraduateswithsuchexperiencesarehighlyactiveinthedevelopmentoffluidmachineries.MasaharuMatsubaraIn the FutureMechanical Systems EngineeringAfter GraduationInourlaboratory,complexfluidflowswithheat/masstransferarestudiedbynumericalsimulations.Recently,thankstodevelopmentofefficientnumericalmethodsandgreatadvanceincomputers,wehavebeenabletoinvestigateso-calledmicrofluidicsmoreaccurately.Inparticular,thelatticeBoltzmannmethod(LBM)isapowerfulnumericalscheme,andmultiphasefluidflowssuchasdropletcollisiondynamicsandbubbleflowsaresimulatedbythetwo-phaseLBM.Inmostcompanies,acommercialsoftwareisusuallyusedforquicksolutionoffluidflowproblems.Sometimes,however,actualcomplicatedphenomenaespeciallyinthemicrofluidicsarenotaccuratelysimulatedbyacommercialsoftware.Inthefuture,wehopethatourdevelopedcodebasedontheLBMwillbecomeausefultoolforsolvingcomplicatedproblemsinmultiphasefluidflows.Ph.D.ProfessorBachelorEng.-1994,MasterEng.-1997,DoctorEng.-2000,KyotoUniversity.Specialty:ComputationalFluidDynamics,LatticeBoltzmannSimulationUnder discussion on simulated results among professors and graduate students in our lab. (left); students working on their graduation studies (right).Numerical Simulation ofMicrofluidics (Multiphase Flow)Examples of simulated results: liquid-liquid two-phase slug flow in a microchannel (upper left); red blood cells passing through a throat (lower left); distribution of wall shear stress around a cerebral aneurysm at bifurcations (right).Studentsinourlaboratorymainlygointovariousindustries:automobileindustry,consumer-electronicsmaker,heavyindustry,precisionequipmentmaker,andsoon.Prof.Yoshinowouldlikethemtoopenanewfrontierinmanykindsofindustriesasamechanicalengineer.Masato YoshinoIn the FutureMechanical Systems EngineeringAfter Graduation# These photos are cited by Sai+SpecialNo. 365:(URL:http://saiplus.jp/special/2016/03/365.php)53

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