2020-2022 YAMAGATA UNIVERSITY Research Seeds Collection

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11/20dτξης+>=<000τττH0===++nnyxH0H1H2H1=H2=H3=z=d0=dH0H=d30H12162()τττn63()Heaviside()ττ()τ()()ττττ()τ()τ()()ττττ()τContentContent：　Our research interests center around modeling and numerical simulation of multiphase flows with complex simulationofmultiphasedeformation, separation, and merging of fluid interfaces. separation,andmergingoffluidinterfaces.　We have developed a new interface capturing method by Wehavedevelopedanewinterfacecapturingmethodbychoosingchoosing the multidimensional Heaviside function as the themultidimensionalHeavisidefunctionastheinterfaceindicatorinterface indicator function. The new method captures the function.Thenewmethodcapturestheinterfaceinonegridcell.Weinterface in one grid cell. We have devised the center of havedevisedthecenterofmassapproximationfortheMTHINCmass approximation for the MTHINC method. This method.Thissignificantlyreducedthealgorithmiccomplexityofthesignificantly reduced the algorithmic complexity of the originalmethodwhilemaintainingaccuracy.Wehavedesignedanoriginal method while maintaining accuracy. We have analyticallyandconsecutivelydifferentiable/integrableinterpolationdesigned an analytically and consecutively differentiable/functionthatconvergestotheHeavisidefunction.Weaimtoapplyitintegrable interpolation function that converges to the tosimulationtechnology.WearealsoworkingonmodelingandHeaviside function. We aim to apply it to simulation optimizationofmicroscaleultrasonicatomization.technology. We are also working on modeling and optimization of microscale ultrasonic atomization.Appealing point：Kinematic Model(Walker with User’s Leg)Walker driven by crutch motionWalker with Assist DeviceAssisting Device for StandingOurresearchinterestscenteraroundmodelingandnumericalflowswithcomplexdeformation,Weareactivelyengagedinindustry-academiacollaboration,andSpecial objectiveswelcomejointresearchonmodelingandnumericalsimulationofmultiphaseflows.　We are actively engaged in industry-academia collaboration, and welcome joint research on modeling and numerical simulation of multiphase flows.Yamagata UniversityGraduate School of Science and Engineering Research Interest ：Fluid engineering, Yamagata University Graduate School of Science and Engineering Research InterestE-mail ：tameo@yz.yamagata-u.ac.jpFluid engineering, Computational fluid dynamicsTel ：+81-238-26-3231Fax：+81-238-26-3231E-mail ・ tameo@yz.yamagata-u.ac.jpTel ・ +81-238-26-3231Fax ・ +81-238-26-3231Content：ContentWedesignanddevelopthewalkerwiththeassistdevice　We design and develop the walker with the assist device translatingthesuspectedwalkingmotiontotherotatingwheeltranslating the suspected walking motion to the rotating motion.Usingthiswalker,therehabilitantsaresupportedbythewheel motion. Using this walker, the rehabilitants are saddle,sotheirhandsandlegsarerelievedfrompainkeepingtheirsupported by the saddle, so their hands and legs are relieved bodybalance.Theassistdeviceisdesignedbyusingofplanar6-linkfrom pain keeping their body balance. The assist device is designed by using of planar 6-link mechanism, which mechanism,whichtransformsaoscillatingmotiontoarotatingtransforms a oscillating motion to a rotating motion. This motion.Thismechanismisdesignedtomakeitspedalfollowafootmechanism is designed to make its pedal follow a foot motion motioninawalkingbycomparingthecouplercurvewithain a walking by comparing the coupler curve with a trajectorygeneratedbyaanklejointinawalkingmotion.trajectory generated by a ankle joint in a walking motion. 　Using the same design method, we also develop the device Usingthesamedesignmethod,wealsodevelopthedeviceforfor assisting standing movement, whose seat plate follows assistingstandingmovement,whoseseatplatethefollowsthe movement of the thigh in the action of standing up for movementofthethighintheactionofstandingupforthepurposeofthe purpose of relieving the burden from the joints and relievingtheburdenfromthejointsandreducingtheeffortreducing the effort associated with nursing care. With assisting springs attached to the slider joint and the seat associatedwithnursingcare.Withassistingspringsattachedtotheplate, the input torque applied by user’s arm can be used to sliderjointandtheseatplate,theinputtorqueappliedbyuser’sarmdevice the mechanism. canbeusedtodevicethemechanism.Appealingpoint：WeexplorethepossibilityofthemechanismtoSpecial objectivesapplyanassistdevicedrivenuser'sownpowerwithoutsupplyingthe　We explore the possibility of the mechanism to apply an externallargeenergy.assist device driven user's own power without supplying the external large energy.Yamagata UniversityGraduate School of Science and Engineering Research Interest ：Design and Analysis of Planar Yamagata University Graduate School of Science and Engineering and Spatial MechanismResearch InterestE-mail ：nango@yz.yamagata-u.ac.jpDesign and Analysis of Planar and Spatial MechanismTel ：+81-238-26-3235E-mail ・ nango@yz.yamagata-u.ac.jpTel ・ +81-238-26-3235Fax：+81-238-26-3235Fax ・ +81-238-26-3235HP ：http://nango-lab.yz.yamagata-u.ac.jp/HP・http://nango-lab.yz.yamagata-u.ac.jp/Computational fluid dynamicsPlease put your photograph. Please put your photograph. Simulation of slab liquid jetSimulation of flow around a carUltrasonic spray simulationInanalgebraicVOFmethod,thefluidinterfaceismodeledbytheindicatorfunctionH0.WehavedevelopedanewinterfacecapturingmethodbychoosingthemultidimensionalHeavisidefunctionviaasingleparametervariableτforH0andanalyticallyderivingitsconsecutiveintegralfunctions.Simulation of swirling/descending water flowAssociate Professor Tameo NakanishiAssociate Professor Jun NangoModeling and Numerical Simulation of Multiphase Flows with InterfacesModeling and Numerical Simulation of Multiphase Flows with InterfacesAssociate Professor Tameo NakanishiDesign of Mechanism for Assisting Walking and Standing Movement using Design of Mechanism for Assisting Walking and Standing Movement using Planar LinkagePlanar LinkageAssociate Professor Jun Nango