Search

Your search keyword '"Yanase, Shinichiro"' showing total 404 results
Start Over Author "Yanase, Shinichiro"
404 results on '"Yanase, Shinichiro"'

1. Vortex solutions of the generalized Beltrami flows to the incompressible Euler equations

Author

Fujimoto, Minoru, Uehara, Kunihiko, and Yanase, Shinichiro

Subjects
Physics - Fluid Dynamics
Abstract

As for the solutions of the generalized Beltrami flows to the incompressible Euler equations besides the solutions separating radius and axial components, there are only several solutions found as the Hill's vortex solutions. We will present a series of vortex solutions in this category for the generalized Beltrami flows to the incompressible Euler equations., Comment: 5 pages more...

Published
2015

2. A viscous solution of the spherical vortex to the Navier-Stokes equations

Author

Fujimoto, Minoru, Uehara, Kunihiko, and Yanase, Shinichiro

Subjects
Physics - General Physics, Physics - Fluid Dynamics
Abstract

We deal with the Hill's spherical vortex, which is an exact solution to the Euler equation, and manage the solution to satisfy the incompressible Navier-Stokes(INS) equations with a viscous term. Once we get a viscous solution to the INS equations, we will be able to analyze the flows with discontinuities in vorticity. In the same procedure, we also present a time developing exact solution to the INS equations, which has a rotation on the axis besides the Hill's vortex., Comment: 4 pages more...

Published
2014

Catalog

Books, media, physical & digital resources
See catalog results

22. Liquid-Liquid Mixing in Helical Pipes

Author

ASIWA, Tatsuki, primary, HAYAMIZU, Yasutaka, additional, HYAKUTAKE, Toru, additional, SIRAISI, Ryoya, additional, GONDA, Takesi, additional, OHTSUKA, Sigeru, additional, MORITA, Shinichi, additional, and YANASE, Shinichiro, additional more...

Published
2021
Full Text
View/download PDF

23. Sperm Behavior in Microfluidic Channels

Author

SAKAMOTO, Toranosuke, primary, HAYAMIZU, Yasutaka, additional, HYAKUTAKE, Toru, additional, SHIRAISHI, Ryoya, additional, GONDA, Takeshi, additional, OTSUKA, Shigeru, additional, MORITA, Shinichi, additional, and YANASE, Shinichiro, additional more...

Published
2021
Full Text
View/download PDF

37. Liquid-Liquid Mixing in Helical Pipes

Author

ASHIWA, Tatsuki, primary, HAYAMIZU, Yasutaka, additional, HYAKUTAKE, Toru, additional, SHIRAISHI, Ryoya, additional, GONDA, Takeshi, additional, OHTSUKA, Shigeru, additional, MORITA, Shinichi, additional, and YANASE, Shinichiro, additional more...

Published
2020
Full Text
View/download PDF

40. Numerical prediction of unsteady fluid flow and heat transfer through a stationary curved square duct.

Author

Hasan, Mohammad Sanjeed, Mondal, Rabindra Nath, Yanase, Shinichiro, Alam, Muhammad Mahbubul, Rahman, Muhammad Ashiqur, and Ali, Mohammad

Subjects
HEAT transfer fluids, NUSSELT number, AXIAL flow, FLOW velocity, FLOW instability, UNSTEADY flow, NANOFLUIDICS
Abstract

Time-dependent flow behavior through a curved duct is widely encountered in engineering and cell sorting sections. In this article, we have numerically investigated time-dependent fluid flow and dynamic heat transfer related to the stationary curved square duct, paying particular attention to the dependence of velocity and temperature fields on Dean number (Dn), Grashof number (Gr), curvature (δ) and aspect ratio. Here, the outer and bottom walls of the duct are maintained at high temperature whereas the inner and upper walls adiabatically segregated. In the first instance, time evolution calculation of the unsteady solutions has been performed for an extensive range of the Dean number (100 ≤ Dn ≤ 1000) and the Grashof number (100 ≤ Gr ≤ 1000) while other parameters have been considered to be fixed. Time-dependent solutions show that the flow undergoes through various flow instabilities regarding the range of parameters. It has been seen that three types of flow characters, steady-state, periodic, multi-periodic oscillations have been constructed in the time vs. Nusselt number for cooling wall plane. To point out the periodic and multi-periodic flow more clearly, power spectrum has been accomplished. Typical contours of two types of flow velocity such as axial and secondary flow and isotherm (temperature profiles) have been obtained for various values of Dn and Gr. It is found that only two-vortex asymmetric solutions appear for the steady-state solution whereas two- to four-vortex for the periodic and multi-periodic flows. Heat transfer has been demonstrated and it is found that heat transfer is enhanced by the secondary flow particularly when the Dean vortices emerge at outer concave wall. The present investigation reveals that there is a sharp influence amidst the ardor-induced buoyancy compulsion and the centrifugal instability in the curved duct that stimulates fluid composition and consequently enhances heat transfer in the fluid. [ABSTRACT FROM AUTHOR] more...

Published
2020
Full Text
View/download PDF

42. 低侵襲性人工血管の開発 (Topology optimization theory and applications toward wide fields of natural sciences)

Author

Nakazawa, Takashi, Sano, Yoshihiko, Hyakutake, Toru, Tagami, Daisuke, Katamine, Eiji, Azegami, Hideyuki, Yanase, Shinichiro, and Ugawa, Toyomu

Subjects
surgical procedures, operative, Shape optimization, Hydrodynamics stability, Navier-Stokes equation
Abstract

In this article, we report on-going projects about developments of less-invasive artificial blood tubes (Graft) for Hemodyalysis. Blood is flowing over 2m/s because of pressure gradient between artery and vein which are connected by the Graft. It causes a stenosis at the junction between the Graft and the vein, and finally the stenosis raises low efficiency of the Hemodyalysis and more infection disease. For solving this problem, we develop the graft with a sudden contraction (FCG: Flow Control Graft), and some animal experiments provide enough evidence of effectiveness. Now, by operating shape optimization, more efficient and less invasive FCG is developed., "Topology optimization theory and applications toward wide fields of natural sciences". May 7～9, 2014. edited by Takashi Nakazawa. The papers presented in this volume of RIMS Kôkyûroku Bessatsu are in final form and refereed. more...

Published
2015

43. Linear Stability of Fluid Flows and its Applications (Topology optimization theory and applications toward wide fields of natural sciences)

Author

Yanase, Shinichiro and Watanabe, Takeshi

Subjects
準解析解, 線形安定性, 流体力学, Newton-Krylov法, 解の分岐
Abstract

First, mathematical formulation of linear stability analysis in fluid mechanics is given. Next, several examples in which the linear stability analysis was successfully applied are presented. Then, bifurcation diagrams are shown, and the basic equations by which fluid motions are calculated for specific boundary conditions are explained. Finally, numerical methods to obtain quasi‐analytic solutions in high accuracy are addressed, on which the perturbation is superimposed and thus the linear stability analysis can be applied, in the case that an exact solution is difficult to obtain., "Topology optimization theory and applications toward wide fields of natural sciences". May 7～9, 2014. edited by Takashi Nakazawa. The papers presented in this volume of RIMS Kôkyûroku Bessatsu are in final form and refereed. more...

Published
2015

44. 印加磁場効果に基づくホール型MHD発電の実験実証

Author

Muta, Masayuki, Norii, Takumi, Nagata, Yasunori, Kouchi, Toshinori, and Yanase, Shinichiro

Abstract

平成29年度宇宙航行の力学シンポジウム（2017年12月7日-8日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Symposium on Flight Mechanics and Astrodynamics: 2017 (December 7-8, 2017. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000124035 more...

Published
2017

45. ToFカメラを用いた柔軟構造飛翔体の風洞通風中の姿勢・形状測定

Author

Nagata, Yasunori, Ohe, Hirotaka, Kouchi, Toshinori, Yanase, Shinichiro, and Yamada, Kazuhiko

Abstract

平成29年度宇宙航行の力学シンポジウム（2017年12月7日-8日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Symposium on Flight Mechanics and Astrodynamics: 2017 (December 7-8, 2017. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000124011 more...

Published
2017