Introduction

Hiromichi Kobayashi is a distinguished researcher specializing in fluid dynamics, turbulence, and magnetohydrodynamics. His work elucidates the complex interactions in quantum fluids, supernovae, and plasma systems, contributing significantly to the understanding of subgrid-scale models and energy transfer in turbulent flows.

■Fluid Dynamics and Turbulence
・Research Objective: Drag reduction using traveling wave-like wall deformation
- Title: Large-eddy simulation of high-Reynolds-number turbulent channel flow controlled using streamwise traveling wave-like wall deformation for drag reduction, Nabae Yusuke, Inagaki Kazuhiro, Kobayashi Hiromichi, Gotoda Hiroshi, Fukagata Koji （Journal of Fluid Mechanics） 1003 Jan. 2025
・Research Objective Research on aerodynamics around baseball
- Title: Aerodynanmic Study on "Gyro-forkball" of Baseball, Yin Yuwei, Aoki Takayuki, Watanabe Seiya, Kobayashi Hiromichi, Niwa Masayoshi (Nagare) 42 ( 6 ) 376-385 Dec. 2023
・Research Objective: To analyze the role of anisotropic subgrid-scale stress in turbulent shear flows for improving large-eddy simulation models.
- Title: Analysis of anisotropic subgrid-scale stress for coarse large-eddy simulation, Inagaki Kazuhiro, Kobayashi Hiromichi （Physical Review Fluids） 8 （ 10 ） Oct. 2023
■Quantum Fluids and Vortices
・Research Objective: To compare the influence of two mutual friction models on quantized vortices and normal fluid in superfluid 4He using two-way coupled simulations.
- Title: Influence of different mutual friction models on two-way coupled quantized vortices and normal fluid in superfluid, Kobayashi Hiromichi, Yui Satoshi, Tsubota Makoto （Physical Review Fluids） 9 （ 10 ） Oct. 2024
・Research Objective: To determine quantum dissipation caused by mutual friction in superfluid by filming the motion of quantized vortex rings in superfluid helium
- Title: Imaging quantized vortex rings in superfluid helium to evaluate quantum dissipation, Tang Yuan, Guo Wei, Kobayashi Hiromichi, Yui Satoshi, Tsubota Makoto, Kanai Toshiaki （Nature Communications） 14 （ 1 ） May. 2023
・Research Objective: To investigate the diffusion behavior of quantized vortices in ultraquantum turbulence in superfluid helium-4 using numerical simulations.
- Title: Universal Anomalous Diffusion of Quantized Vortices in Ultraquantum Turbulence, Yui Satoshi, Tang Yuan, Guo Wei, Kobayashi Hiromichi, Tsubota Makoto （Physical Review Letters） 129 （ 2 ） Jul. 2022
■Magnetohydrodynamics (MHD)
・Research Objective: Investigation of MHD Taylor-Couette flow in axial magnetic field
- Title: Turbulent Taylor–Couette flow with magnetohydrodynamic interaction in axial magnetic field, Kobayashi Hiromichi, Hasebe Takahiro, Fujino Takayasu, Takana Hidemasa （Physics of Fluids） 37 ( 2 ) 027165 Feb. 2025
・Research Objective: To validate theoretical analyses on the power generation characteristics of a co-axial MHD energy conversion device through experimental investigations.
- Title: Experimental and theoretical analyses on power generation characteristics of co‐axial MHD energy conversion device, Hasebe Takahiro, Sasaki Ryo, Fujino Takayasu, Takana Hidemasa, Kobayashi Hiromichi （Electrical Engineering in Japan） 216 （ 3 ） Sep. 2023
・Research Objective: The objective is to theoretically analyze annular laminar flows with MHD interaction driven by a rotating co-axial cylinder.
- Title: Theoretical Analysis of Annular Laminar Flows with MHD Interaction Driven by Rotating Co-axial Cylinder, Sasaki Ryo, Fujino Takayasu, Takana Hidemasa, Kobayashi Hiromichi （IEEJ Transactions on Power and Energy） 141 （ 3 ） 280-286 Mar. 2021
■Electrical Efficiency and Shape Optimization
・Research Objective: To numerically analyze the response of a liquid metal MHD power generation system to various external inputs and examine the electrical efficiency in the presence of shape loss.
- Title: Analyses on response of a liquid metal MHD power generation system to various external inputs, Hu Liancheng, Kobayashi Hiromichi, Okuno Yoshihiro （IEEJ Transactions on Electrical and Electronic Engineering） 10 （ 3 ） 268-273 May. 2015
■Plasma and Particle Synthesis
・Research Objective: To develop a highly reproducible method for synthesizing hollow zirconia particles using atmospheric-pressure plasma processing with inkjet droplets.
- Title: Highly Reproducible Synthesis of Hollow Zirconia Particles via Atmospheric-Pressure Plasma Processing with Inkjet Droplets, Nitta Kaishu, Sakai Tomoki, Muneoka Hitoshi, Shimizu Yoshiki, Kobayashi Hiromichi, Terashima Kazuo, Ito Tsuyohito （Plasma Chemistry and Plasma Processing） 44 （ 1 ） 289-303 Jan. 2024
・Research Objective: To examine the evaporation behavior of well-controlled inkjet droplets in atmospheric-pressure nonequilibrium argon plasma through both experiments and modeling.
- Title: Evaporation behavior of liquid microdroplets in atmospheric-pressure nonequilibrium plasma, Nitta Kaishu, Muneoka Hitoshi, Shimizu Yoshiki, Kobayashi Hiromichi, Terashima Kazuo, Ito Tsuyohito （Plasma Sources Science and Technology） 32 （ 5 ） 055008 May. 2023
■Astrophysics and Supernovae
Research Objective: To realize supernova explosions in three-dimensional numerical simulations by considering the parity symmetry breaking of neutrinos and performing rotating homogeneous turbulent flow calculations.
■Scientific Knowledge and Terminology
Research Objective: To investigate the interest and knowledge levels of first-year university students in natural sciences and compare the results with those from 10 years ago.
Research Objective: To investigate the interest and knowledge levels of first-year university students in natural sciences in 2012 and compare the findings with those from 10 and 20 years ago.

Areas of Research

・Performance Comparison of Various Models in Large Eddy Simulation
・Quantum Turbulence
・Electromagnetic Fluid Dynamics (MHD) Power Generation Using Frozen Inert Gas Plasma (FIP) and Liquid Meltal
・Research on High-Temperature Air Combustion
・Mathematical Physics, Basic Properties
・Plasma Science
・Fluid Engineering

Social Contributions

・Understanding of cooling technologies and quantum fluid dynamics: The research on quantum fluid dynamics and advanced cooling technologies can lead to significant advancements in cryogenics and quantum turbulence by improving our understanding of superfluid helium and two-fluid turbulence.
・Improvement in engineering simulations and environmental predictions: Insights into energy transfer in turbulent flows can enhance the accuracy of large eddy simulations (LES), leading to better predictions of weather patterns and more efficient engineering designs.