Faculty Profiles - TANAKA Kento

Papers - TANAKA Kento

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Statistical analysis of deformation of a shock wave propagating in a local turbulent region Reviewed

K. Tanaka, T. Watanabe, K. Nagata

Physics of Fluids 32 ( 9 ) 096107 - 096107 2020.9

Spherical shock wave modulation induced by interaction with homogeneous isotropic turbulence

K. Tanaka, T. Watanabe, H. Suzuki, T. Kouchi

Physics of Fluids 37 ( 2 ) 2025.2

Authorship：Lead author Publishing type：Research paper (scientific journal) Publisher：AIP Publishing

In this study, we have performed direct numerical simulations (DNSs) of the interaction between a spherical shock wave and homogeneous isotropic turbulence to investigate shock wave modulation. We considered two parameters, the central pressure of the initial high-energy region that generates the shock wave and the turbulent Mach number Mt. DNSs were performed under five conditions. A polar coordinate system (r,θ,ϕ) was then defined for the analyses, with the center of the high-energy region as the origin. The local position of the shock wave rs was defined as the position of the maximum value PM of the radial pressure distribution P(r) at two declinations (θ,ϕ) in the polar coordinate system. Specifically, rs and PM were functions of (θ,ϕ), and their statistics were computed using data over all (θ,ϕ) at each time. The standard deviation of the fluctuation of rs increased monotonically with the shock-wave front propagation in turbulence. This shows that the shock-wave front deformation grew monotonically. The mean pressure distribution conditioned by the fluctuations of rs and joint probability density function of fluctuation of rs and PM show that there is a negative correlation between the deformation of the shock-wave front and the local intensity of the shock wave. This indicates that the deformed shock-wave front tends to return to its original shape. However, the monotonous growth of the deformation indicates the presence of a counter-effect that allows it to grow.

DOI： 10.1063/5.0249098

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Numerical analysis validating the standard k-epsilon model for the kinetic energy of turbulence subjected to weak but long-lasting wind tunnel blockage acceleration

Akira ONO, Hiroki SUZUKI, Toshinori KOUCHI, Kento TANAKA

Journal of Fluid Science and Technology 20 ( 1 ) JFST0004 - JFST0004 2025

主流乱れと乱流境界層の混合流れ場生成のための流入境界条件の検討

田中健人, 鈴木智也, 鈴木博貴, 河内俊憲

日本航空宇宙学会論文集 accepted 2025

Phase-lock Analysis of Two-Dimensional Transonic Shock Buffet by Using Machine Learning

Tsubasa Kikuchi, Toshinori Kouchi, Kento Tanaka, Koichi Takeuchi

AIAA SCITECH 2024 Forum 2024.1

Locally Broken Shock Wave Detection with One-Dimensional Convolutional Neural Network in Shock Turbulence Interaction

Kento Tanaka, Toshinori Kouchi, Hiroki Suzuki, Koichi Takeuchi

AIAA SCITECH 2024 Forum 2024-2340 2024.1

Local geometry of a weak normal shock wave interacting with turbulence Reviewed International journal

A. Kusuhata, K. Tanaka, T. Watanabe, K. Nagata, A. Sasoh

Physics of Fluids 35 ( 8 ) 86110 2023.8

Impact of Pitot tube diameter on the centre line mean flow velocity in multi-scale grid-generated turbulence Reviewed

Hiroto Yamaguchi, Hiroki Suzuki, Kento Tanaka, Toshinori Kouchi

Journal of Physics: Conference Series 2313 ( 1 ) 012001 - 012001 2022.7

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Publishing

Abstract

In this study, the impact of the leading-edge diameter of a Pitot tube on the mean flow of the decaying turbulence generated by a multi-scale grid was investigated. Standard Pitot tubes with leading edge diameters of 4 and 6 mm were used in this study, and a multi-scale grid was installed at the entrance of the test section to generate the decaying turbulence. The characteristic velocity was observed to be 2.8 m/s. In the downstream region of the test section, the mean velocities measured with the two Pitot tubes were in sufficiently good agreement, as well as the acceleration parameters calculated in this region. However, in the upstream region, the mean flow velocities obtained with the two Pitot tubes were slightly different. The thin Pitot tube showed a higher mean flow velocity in this region, corresponding to the jet-like structure that has been described in previous research. In contrast, this higher mean velocity in the upstream region was not observed in the mean flow velocity distribution obtained with the thick Pitot tube. This difference is discussed here from the perspective of the turbulent component and measurement uncertainty.

DOI： 10.1088/1742-6596/2313/1/012001

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Other Link： https://iopscience.iop.org/article/10.1088/1742-6596/2313/1/012001/pdf

Solenoidal linear forcing for compressible, statistically steady, homogeneous isotropic turbulence with reduced turbulent Mach number oscillation Reviewed

T. Watanabe, K. Tanaka, K. Nagata

Physics of Fluids 33 ( 9 ) 095108 - 095108 2021.9

Characteristics of shearing motions in incompressible isotropic turbulence Reviewed International journal

T. Watanabe, K. Tanaka, K. Nagata

Physical Review Fluids 5 072601(R) 2020.7

Transverse Jet Mixing in a Supersonic Grid Turbulence

Toshinori Kouchi, Masaki Iwachido, Takahiro Nakagawa, Yasunori Nagata, Shinichiro Yanase

AIAA Scitech 2020 Forum 35th 2020.1

Direct Numerical Simulations on Effects of Turbulent Mach Number in Interaction between Planar Shock Wave and Turbulence Reviewed

K. Tanaka, T. Watanabe, K. Nagata

Abstract of 17th European Turbulence Conference (ETC17) 269 (1 page) 2019.9

Effects of Turbulence Compressibility on Normal Shock Wave in Shock Turbulence Interactions Reviewed

K. Tanaka, T. Watanabe, K. Nagata

Proc. of 32nd International Symposium on Shock Waves (ISSW32) OR-22-0208 (7 pages) 2019.7

Amplification and attenuation of shock wave strength caused by homogeneous isotropic turbulence Reviewed

K. Tanaka, T. Watanabe, K. Nagata, A. Sasoh, Y. Sakai, T. Hayase

Physics of Fluids 30 ( 3 ) 035105 - 035105 2018.3

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