KOHNO Haruhiko

写真a

Title

Associate Professor

Laboratory

680-4 Kawazu, Iizuka-shi, Fukuoka

Research Fields, Keywords

Computational Fluid Dynamics, Magnetohydrodynamics, Applied Plasma Physics, Applied Mathematics

E-mail

E-mail address

Scopus Paper Info  
Total Paper Count: 0  Total Citation Count: 0  h-index: 6

Citation count denotes the number of citations in papers published for a particular year.

Undergraduate Education 【 display / non-display

  • 2000.03   Keio University   Faculty of Science and Engineering   Graduated   JAPAN

Post Graduate Education 【 display / non-display

  • 2011.05  Massachusetts Institute of Technology   Department of Nuclear Science and Engineering  Doctoral Program  Completed  UNITED STATES

  • 2003.03  Keio University  Graduate School, Division of Science and Engineering  School of Science for Open and Environmental Systems  Doctoral Program  Completed  JAPAN

Degree 【 display / non-display

  • Massachusetts Institute of Technology -  Doctor of Science  2011.06

  • Keio University -  Doctor of Engineering  2003.03

Biography in Kyutech 【 display / non-display

  • 2019.04
    -
    Now

    Kyushu Institute of TechnologyFaculty of Computer Science and Systems Engineering   Department of Physics and Information Technology   Associate Professor  

  • 2013.04
    -
    2019.03

    Kyushu Institute of TechnologyFaculty of Computer Science and Systems Engineering   Department of Mechanical Information Science and Technology   Associate Professor  

Biography before Kyutech 【 display / non-display

  • 2012.07
    -
    2013.03

    Kyushu University   INAMORI Frontier Research Center   Specially Appointed Assistant Professor   JAPAN

  • 2011.07
    -
    2012.06

    Lehigh University   Department of Physics   Research Scientist   UNITED STATES

  • 2005.05
    -
    2006.07

    Coventry University   Applied Mathematics Research Centre   JSPS Postdoctoral Fellowships for Research Abroad   UNITED KINGDOM

  • 2003.08
    -
    2005.01

    Massachusetts Institute of Technology   Department of Mechanical Engineering   Special researcher of the Japan Society for the Promotion of Science   UNITED STATES

Academic Society Memberships 【 display / non-display

  • 2021.02
    -
    Now
     

    The Japan Society for Computational Engineering and Science  JAPAN

  • 2017.06
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    Now
     

    The Japan Society of Plasma Science and Nuclear Fusion Research  JAPAN

  • 2013.01
    -
    Now
     

    The Japan Society of Mechanical Engineers  JAPAN

Specialized Field (scientific research fund) 【 display / non-display

  • Nuclear fusion studies

  • Plasma science

  • Computational science

  • Fluid engineering

 

Publications (Article) 【 display / non-display

  • Convergence improvement of the simultaneous relaxation method used in the finite element analysis of incompressible fluid flows

    Haruhiko Kohno

    Engineering Computations (Swansea, Wales)  ( Emerald Publishing )  37 ( 2 ) 481 - 500   2020.03  [Refereed]

     View Summary

    Purpose: This paper aims to present an improved finite element method used for achieving faster convergence in simulations of incompressible fluid flows. For stable computations of incompressible fluid flows, it is important to ensure that the flow field satisfies the equation of continuity in each element of a generally distorted mesh. The study aims to develop a numerical approach that satisfies this requirement based on the highly simplified marker-and-cell (HSMAC) method and increases computational speed by introducing a new algorithm into the simultaneous relaxation of velocity and pressure. Design/methodology/approach: First, the paper shows that the classical HSMAC method is equivalent to a Jacobi-type method in terms of the simultaneous relaxation of velocity and pressure. Then, a Gauss–Seidel or successive over-relaxation (SOR)-type method is introduced in the Newton–Raphson iterations to take into account all the derivative terms in the first-order Taylor series expansion of a nodal-averaged error explicitly. Here, the nine-node quadrilateral (Q2–Q1) elements are used. Findings: The new finite element approach based on the improved HSMAC algorithm is tested on fluid flow problems including the lid-driven square cavity flow and the flow past a circular cylinder. The results show significant improvement of the convergence property with the accuracy of the numerical solutions kept unchanged even on a highly distorted mesh. Originality/value: To the best of the author’s knowledge, the idea of using the Gauss–Seidel or SOR method in the simultaneous relaxation procedure of the HSMAC method has not been proposed elsewhere.

    DOI Scopus

  • Three-dimensional numerical analysis of magnetohydrodynamic flows driven by traveling magnetic fields in an annular channel

    Yoshiteru MURE, Haruhiko KOHNO

    The Proceedings of The Computational Mechanics Conference  ( The Japan Society of Mechanical Engineers )  2019 ( 0 )   2019.09

     View Summary

    Three-dimensional numerical simulation of incompressible, magnetohydrodynamic flows under traveling magnetic fields are carried out, which takes into account the coupling with the electromagnetic field in the solid and gas regions. A numerical scheme is constructed by combining the Galerkin finite element method and the edge-element based finite element method, which are applied to the discretizations of Navier-Stokes equations and the electromagnetic field equations, respectively. The solution algorithm for fluid flow is based on an explicit fractional step approach and the simultaneous relaxation of velocity and pressure to satisfy the continuity equation. The electromagnetic field equations are formulated with the use of the magnetic vector potential which is defined on the edge elements. Numerical simulations of the MHD flows in an annular channel are carried out under traveling magnetic fields. It is confirmed that the magnitude and oscillation amplitude of the z-component of the velocity becomes larger with the increase in the Hartmann number. It is also shown that the frequency of the velocity pulsation is doubled than the frequency of the externally applied traveling magnetic field.

    DOI CiNii

  • Three-dimensional numerical analysis of magnetohydrodynamic flows under alternating-current magnetic fields in a square duct

    Shunsuke SAKAI, Yoshiteru MURE, Haruhiko KOHNO

    The Proceedings of The Computational Mechanics Conference  ( The Japan Society of Mechanical Engineers )  2019 ( 0 )   2019.09

     View Summary

    In our previous work, a three-dimensional numerical scheme for analyzing magnetohydrodynamic (MHD) flows under alternating-current magnetic fields was constructed, which takes into account the coupling with the electromagnetic fields in the solid and gas regions. In this study, a periodic boundary condition and an external traveling-wave magnetic field are introduced into the numerical scheme to investigate the dependences of the MHD flow in a square duct on the Hartmann number and the phase velocity of the external magnetic field. It is shown that the flow in the axial direction is encouraged with the increase in the Hartmann number or the angular frequency, while an opposite behavior is observed in terms of the oscillation amplitude of the fluid flow.

    DOI CiNii

  • Investigation of the stability in two-dimensional sloshing analyses using an arbitrary Lagrangian–Eulerian method

    Takuto KOJIMA, Haruhiko KOHNO

    The Proceedings of The Computational Mechanics Conference  ( The Japan Society of Mechanical Engineers )  2019 ( 0 )   2019.09

     View Summary

    In this study, we investigate the stability required for a two-dimensional sloshing analysis with the use of an arbitrary Lagrangian–Eulerian (ALE) method. Here, two well-known upwind methods are employed for the discretization of the kinematic condition on the free surface: SUPG and CIP methods. On the other hand, the Navier-Stokes equations are discretized by a finite element scheme without any upwind method to see whether the stability is retained solely by introducing an appropriate upwind method into the calculation on the free surface. It is shown in both primary and tertiary modes that stable results are obtained when the CIP method is employed, while unstable grid-scale oscillations are observed at some point when the SUPG method is used. This suggests that a semi-Lagrangian scheme is essential for stable computation based on the ALE formulation.

    DOI CiNii

  • Calculation of RF sheath properties from surface wave-fields: a post-processing method

    J. R. Myra, H. Kohno

    Plasma Physics and Controlled Fusion  ( IOP Publishing )  61 ( 9 ) 095003   2019.07  [Refereed]

     View Summary

    © 2019 IOP Publishing Ltd. In ion cyclotron range of frequency (ICRF) experiments in fusion research devices, radio frequency (RF) sheaths form where plasma, strong RF wave fields and material surfaces coexist. These RF sheaths affect plasma material interactions such as sputtering and localized power deposition, as well as the global RF wave fields themselves. RF sheaths may be modeled by employing a sheath boundary condition (BC) in place of the more customary conducting wall (CW) BC; however, there are still many ICRF computer codes that do not implement the sheath BC. In this paper we present a method for post-processing results obtained with the CW-BC. The post-processing method produces results that are equivalent to those that would have been obtained with the RF sheath BC, under certain assumptions. The post-processing method is also useful for verification of sheath BC implementations and as a guide to interpretation and understanding of the role of RF sheaths and their interactions with the waves that drive them.

    repository DOI Scopus

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Conference Prsentations (Oral, Poster) 【 display / non-display

  • Numerical analysis of conductive droplet oscillation under DC magnetic fields using an ALE finite element method

    Kenta SHIBUTA, Haruhiko KOHNO

    Mechanical Engineering Congress, 2021 Japan  (The congress was held fully online via Zoom.)  2021.09  -  2021.09  The Japan Society of Mechanical Engineers

  • Two-dimensional analysis of conductive fluid sloshing under direct-current magnetic fields

    Kenta SHIBUTA, Haruhiko KOHNO

    74th Annual Meeting and Conference  (virtual conference via Webex)  2021.03  -  2021.03  The Japan Society of Mechanical Engineers Kyushu Branch

  • Numerical analysis of droplet oscillation under zero gravity using an ALE finite element method

    Kenta SHIBUTA, Haruhiko KOHNO

    73rd Annual Meeting and Conference  (Kyushu Sangyo University)  2020.03  -  2020.03  The Japan Society of Mechanical Engineers Kyushu Branch

  • Three-dimensional numerical analysis of magnetohydrodynamic flows driven by traveling magnetic fields in an annular channel

    Yoshiteru Mure, Haruhiko Kohno

    The 32nd Computational Mechanics Conference  (Kawagoe Campus, Toyo University)  2019.09  -  2019.09  The Japan Society of Mechanical Engineers

  • Three-dimensional numerical analysis of magnetohydrodynamic flows under alternating-current magnetic fields in a square duct

    Shunsuke Sakai, Yoshiteru Mure, Haruhiko Kohno

    The 32nd Computational Mechanics Conference  (Kawagoe Campus, Toyo University)  2019.09  -  2019.09  The Japan Society of Mechanical Engineers

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Lectures 【 display / non-display

  • オンオフ切替式コイルを適用した気泡・介在物除去技術

    九州工業大学新技術説明会 ( Zoomビデオウェビナーによるオンライン開催 )  2020.12.10  科学技術振興機構、九州工業大学

  • 昇降式コイルを適用した連続鋳造における新たな気泡除去技術

    九州工業大学新技術説明会 ( JST東京本部別館1Fホール(東京・市ケ谷) )  2016.12.22  科学技術振興機構、九州工業大学

  • Radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies

      2015.06.12 

Press 【 display / non-display

  • A new method for the level set equation using a hierarchical-gradient truncation and remapping technique

    Advances in Engineering  2013.05.08

    Haruhiko Kohno, Jean-Christophe Nave

Honors and Awards 【 display / non-display

  • The Young Researcher Fellowship Award for exemplary research in computational mechanics

    2005.06.14     UNITED STATES

    Winner: H. Kohno

  • JSME Young Engineers Award (2001)

    2002.04.08     JAPAN

    Winner: Haruhiko Kohno

Grants-in-Aid for Scientific Research 【 display / non-display

  • Numerical simulation of radio-frequency wave-sheath interactions in tokamak plasmas

    Grant-in-Aid for Young Scientists(B)

    Project Year:  2016.04  -  2019.03

    Project Number:  16K18336

Career of Research abroad 【 display / non-display

  • Development and validation of transport in plasmas and investigation of RF-sheath plasma interactions

    Lehigh University  Project Year:  2011.07  -  2012.06

  • Development of the finite element wave-packet method and the code to evaluate the RF sheath voltage in tokamak plasmas (known as the rfSOL code)

    Massachusetts Institute of Technology  Project Year:  2006.09  -  2011.05

  • Stabilization of interfacial waves and development of a new numerical method in aluminium smelting with alternating current magnetic fields

    Coventry University  Project Year:  2005.05  -  2006.07

  • Development of new FCBI methods applicable to quadrilateral and triangular elements

    Massachusetts Institute of Technology  Project Year:  2003.08  -  2005.01