工学部_研究紹介_2019_英語版

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0.2mmYoshidaLabOurmainresearchinterestiscomputationalfluiddynamics.Currentresearchprojectsare:directnumericalsimulationsofflowsoveranopencavity,includingstudiesoftheeffectsofcavityaspectratioonself-sustainedoscillationsofseparatedshearlayerandrecirculatingvorticesinthecavity;activecontrolofcavityflow;directnumericalsimulationsofjet–edgesystem;directandlargeeddysimulationsoftwo-dimensionalturbulentjets.TheNavier-Stokesequations,thatarethemomentumequationsofflow,arenonliniear.Thussolvingtheseequationsisverydifficult.NumericalsolutionsoftheNavier-Stokesequationsforcomplexflowscanbeobtainedfromnumericalsimulationsusingsupercomputers.Wecaninvestigatethemechanismofcomplexflowusingadvancedsupercomputers.Takashi YoshidaAssociateProfessorPhD Engineering 1995, Nagoya University.Faculty: Nagoya University, 1994-1997.Faculty: Shinshu University, 1997-Isosurfaces of vorticity in flow over cavity. The left figure shows an uncontrolled flow and the right figure shows a controlled flow. Numerical Simulations of Flows using a SupercomputerIsosurfaces of vorticity ina two-dimensional turbulent jet.Numericalsimulationhasbeenausefultoolforengineeringdesignandanalysis.Alumnusfromourlaboratoryareworkingasmechanicalengineers,mechanicaldesigners,softwaredesigners,systemengineers,etc.In the FutureAfter GraduationMechanical Systems EngineeringInourlaboratory,complexfluidflowswhichwecanseeinourdailylifebutcannotunderstandsufficientlyarestudiedbynumericalsimulations.Owingtorecentgreatadvanceincomputers,wehavebeenabletoinvestigatecomplexfluidflowswithhighaccuracy.Inparticular,thecombinationofthelatticeBoltzmannmethod(LBM)withtheimmersedboundarymethod(IBM)isapowerfulnumericalmethod,andcomplexfluidflowsindailylifesuchasfallingleavesorflappingflightbyinsectsaresimulatedbythemethod.Everyonecanobserveinwinterthataleaffluttersandtumblesdown,butcannoteasilypredictthetrajectoryandtheorientationoftheleaf.Similarly,anyonecannotcompletelyanswerthefollowingquestion,i.e.‘Howcaninsectsfly?’.Ifthefluidflowinducedbyinsectsandtheliftforceactingtheirwingsareunderstood,anairplaneflappinglikeinsectsmaybeconstructed.KosukeSuzukiAssistantProfessorPhDinEng.-2014,KyotoUniversity.Specialty: Computational Fluid Dynamics, Lattice Boltzmann Method, Immersed Boundary MethodNumerical Simulation ofComplex Fluid Flows in Daily LifeThe map of ‘Flapping frequency’ vs. ‘Mass’. The simple wing-body model with mass of actual insects can go upward against gravity. Inourlaboratory,youcanacquirenotonlyspecializedknowledgeonfluiddynamics,butalsoabilitiesforlogicallythinking,explaining,andwritingaswellasprogrammingskill.Theseknowledge,abilities,andskillareusefulinawiderangeofengineeringfield.Freeflightsimulationofabutterfly-likeflappingwing-bodymodel.Suchasimplewing-bodymodelcanflyagainstgravity.SuzukiLabIn the FutureMechanical Systems EngineeringAfter Graduation60