Abstract:

The hairpin vortex is considered to be the basic building block commonly observed in the dynamics of transitional and turbulent flows near a wall. On the other hand, due to its diversity, its qualitative aspect such as universality, and also its quantitative aspects such as instability and scale seem hidden in a veil. In order to understand them from the standpoint of reductionism, direct numerical simulations were conducted regarding the evolution of a straight, lifted-up, vortex tube based on Hon & Walker's model, which was originally proposed for a symmetric hairpin vortex tube, under the shear of a laminar boundary-layer flow and its response of the near-wall flows. Effects of varying circulation and angle-to-wall of the vortex tube on its dynamics were considered. The speaker also talks about his recent progress in this study.

 

Brief Biograph:

Education:

2000, Bachelor of Eng.

The University of Tokyo, Department of Aeronautics and Astronautics, Japan,

Research on Cavitation in Internal Cryogenic Flows of Rocket Engine

2002, Master of Eng.

The University of Tokyo, Department of Aeronautics and Astronautics, Japan,

Research on Large-Eddy Simulation of Transitional Flows under Free-Stream Turbulence Targeted at Gas Turbine Cascade Flows

2005, Ph. D of Eng.,

The University of Tokyo, Department of Mechanical Engineering, Japan,

Research on Large-Eddy Simulation of Compressible Transitional Flows in a Turbine Cascade

 

Job:

2005.11-2007.12

Postdoctral Researcher

Kyushu University, Japan,

Research on Numerical Analysis related to Hydrogen Energy

2008.1-2008.12

Postdoctral Fellow,

Center for Turbulence Research, Stanford University/NASA Ames Research Center, USA, Research on Computation of Transition in Hypersonic Flows

2009.4-2012.3

Assistant Professor,

International Advanced Research and Education Organization, Tohoku University, Japan, Research on Computational Aeroacoustics, Hydrogen Energy and Multiphase Flows

2012.4-Present

Associate Professor

Graduate School of Science and Engineering, Ehime University, Japan

 

Research Interest:

Laminar-Turbulent Transition & Turbulence, Aeroacoustics,

Numerical Method, Aeronautical Propulsion

 

Award:

Academic year 2016, Ryumon Award from The Japan Society of Fluid Mechanics,

(An award given to a person under the age of 40 years who contributed to Fluid Mechanics)

 

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