Faculty Profiles - Suzuki Hiroki

Papers - Suzuki Hiroki

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Simplified numerical modeling of rotational speed response for a small wind turbine Reviewed

(peer-reviewed) Proceedings of the International Conference on Power Engineering 2021 (ICOPE-2021) paper No.0130 - (4 pages) 2021.10

Numerical simulation of viscosity/implicit large-eddy steady turbulence with the Reynolds number dependency Reviewed

Naoyuki Iwata, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2047 ( 1 ) 012007 - (7 pages) 2021.10

Authorship：Corresponding author Publishing type：Research paper (scientific journal) Publisher：IOP Publishing

<title>Abstract</title>
This study presents a numerical analysis that models small scale turbulence using numerical viscosity or implicit large-eddy simulation (LES). The motivation for focusing on these models is that the sub-grid scale components of LES are assumed to have a sufficiently high Reynolds number turbulence. The Reynolds number dependence of steady isotropic turbulence is used to validate the present analysis. Here, this dependency ranges from low to high Reynolds numbers. The results of this analysis are validated by comparing them with those of direct numerical simulation. The donor cell method and quick method are used as schemes of the numerical viscosity. Analysis based on the numerical viscosity can give accurate turbulent kinetic energy values at high Reynolds numbers and implicit LES at low Reynolds numbers. However, these models did not accurately predict static pressure fluctuations. These results were discussed by visualizing the large-scale turbulent structures.

DOI： 10.1088/1742-6596/2047/1/012007

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Other Link： https://iopscience.iop.org/article/10.1088/1742-6596/2047/1/012007/pdf

Effects of spatial resolution anisotropy on viscous terms using isotropic steady turbulence numerical analysis Reviewed

Riku Hirabayashi, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2047 ( 1 ) 012008 - (7 pages) 2021.10

Authorship：Corresponding author Publishing type：Research paper (scientific journal) Publisher：IOP Publishing

<title>Abstract</title>
This study presents the effects of spatial resolution anisotropy on an isotropic turbulence field. Here, this turbulence field is steady. In order to set the anisotropy of the spatial resolution, the accuracy order of the viscosity terms is set to be anisotropic. The convection and viscosity terms are discretized using the second-order or fourth-order central difference schemes. The Reynolds number dependence of the turbulence statistics is used to examine this influence. The effects of resolution anisotropy on the small-scale turbulent field obtained by longitudinal derivatives as well as large-scale turbulent fields are small. On the other hand, the small-scale turbulent field obtained by lateral derivatives is significantly affected by the anisotropy of resolution in the low Reynolds number condition.

DOI： 10.1088/1742-6596/2047/1/012008

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Other Link： https://iopscience.iop.org/article/10.1088/1742-6596/2047/1/012008/pdf

Effect of the kinetic energy conservation error on unsteady/steady isotropic turbulence: a numerical simulation study Reviewed

Shinnosuke Nakamura, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2047 ( 1 ) (8 pages) - 012009 2021.10

Authorship：Corresponding author Publishing type：Research paper (scientific journal) Publisher：IOP Publishing

<title>Abstract</title>
This study presents the effects of the conservation error of turbulent kinetic energy on the isotropic turbulence field. Here, the present research focuses on the effects on the unsteady turbulence field in addition to the steady field. This unsteady turbulence field is given by changing the magnitude of the external forcing term using a linear forcing scheme with a sinusoidal function. The conservation error is caused by using the Crank-Nicolson method, which is an implicit time integration method. This result is examined by comparing those with the results with negligible conservation error using the fourth-order Runge-Kutta scheme. For this unsteady turbulence, the period and amplitude of the external forcing term are changed as computational conditions. In contrast to steady turbulence, unsteady turbulence is shown to be affected by turbulent kinetic energy conservation error. These effects are significant when the period is short and the amplitude is large.

DOI： 10.1088/1742-6596/2047/1/012009

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Other Link： https://iopscience.iop.org/article/10.1088/1742-6596/2047/1/012009/pdf

Visualization of intermittency of low-Reynolds-number anisotropic steady incompressible turbulence using implicit/SGS-model-based large-eddy simulation Reviewed

Journal of Physics: Conferense Series 1983 012041 - (8 pages) 2021.8

Time-series observation of the effects of kinetic energy conservation error on isotropic and anisotropic steady incompressible turbulence Reviewed

Ryoma Honda, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 1978 ( 1 ) 012026 - (7 pages) 2021.7

Scalar structures around the mixing interface of a thermal mixing layer in multiscale-generated decaying turbulent flows visualized using DNS database Reviewed

Shotaro Jomura, Hiroki Suzuki, Shinsuke Mochizuki, Yasuhiko Sakai

Journal of Physics: Conference Series 1978 ( 1 ) 012012 - (7 pages) 2021.7

Reynolds Number Dependency of Small Scale Structures in Steady Anisotropic Turbulence Produced by Implicit Large-Eddy Simulation Reviewed

Mayuka Oshibuchi, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 1978 012021 - (8 pages) 2021.7

Autocorrelation Function for Estimating Static Pressure Fluctuation Intensity in Incompressible Homogeneous Turbulence under an Intermediate Reynolds Number Reviewed

Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

Journal of Physics: Conference Series 1978 ( 1 ) 012002 - (8 pages) 2021.7

An experimental study on the equilibrium boundary layer subjected to favourable pressure gradient (Effect of pressure gradient on law of the wall) Reviewed

Yudai Hikita, Hiroki Suzuki, Takatsugu Kameda, Shinsuke Mochizuki

Transactions of the JSME 87 ( 894 ) 20-00394 - 00394 2021.1

Reduced Conservation Error of Kinetic Energy using a Runge-Kutta Algorithm with Reduced Numerical Dissipation Reviewed

Hiroki Suzuki, Koudai Hasebe, Yutaka Hasegawa, Tatsuo Ushijima

Journal of Physics: Conference Series 1633 012021 - (9 pages) 2020.9

Simple Scheme generating an Axisymmetrically Anisotropic Initial Flow of Incompressible Turbulence using a Normal Random Number Vector Reviewed

Hiroki Suzuki, Koudai Hasebe, Yutaka Hasegawa, Tatsuo Ushijima, Shinsuke Mochizuki

Journal of Physics: Conference Series 1592 012004 - (8 pages) 2020.9

Second-Order Kinetic Energy-Conservative Analysis of Incompressible Turbulence under a Collocated Grid System Reviewed

Hiroki Suzuki, Yutaka Hasegawa, Masaya Watanabe, Tatsuo Ushijima, Shinsuke Mochizuki

Journal of Physics: Conference Series 1633 012063 - (9 pages) 2020.9

Small Transparent Prism for the Cross-Sectional Visualization for a Turbulent Scalar Mixing Layer using a Water-Channel PLIF Method Reviewed

Ryota Ukai, Hiroki Suzuki, Shinsuke Mochizuki, Yasuhiko Sakai

Journal of Physics: Conference Series 1592 012001 - (7 pages) 2020.9

Verification of the Numerical Analysis Using a Collocated Grid System Directly Solving the Quasi-Inviscid Incompressible Flow around a Symmetric Airfoil Reviewed

Hiroki Suzuki, Masaya Watanabe, Yutaka Hasegawa, Shinsuke Mochizuki

Journal of Physics: Conference Series 1633 012028 - (10 pages) 2020.9

Influence of Order Enhancement of the Runge-Kutta Method on Low-order Turbulence Statistics of Incompressible Wall Turbulence under a Second-order Central Difference Scheme Reviewed

Shotaro Jomura, Hiroki Suzuki, Yutaka Hasegawa, Shinnosuke Matsuo, Shinsuke Mochizuki

Journal of Physics: Conference Series 1592 012095 - (9 pages) 2020.9

Quasi-Analytical Solutions of a Turbulence-Modeling Equation on the Robustness of Decaying Homogeneous Turbulence Reviewed

Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

Advances in Mechanical Engineering 12 ( 2 ) 1 - 13 2020.2

Simple Analytical Solutions of One-Equation Modelling for Steady/Decaying Homogeneous Turbulence sensitized to Small Strain Reviewed

Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

Journal of Physics: Conference Series 1324 012063 - (8 pages) 2019.10

Simple Mean-Error Estimation of a Recalibration Scheme for Constant-Temperature Anemometry Measurements Reviewed

Hiroki Suzuki, Yoshiaki Shikata, Shinsuke Mochizuki, Yutaka Hasegawa

Journal of Physics: Conference Series 1324 012062 - (7 pages) 2019.10

Monte-Carlo Simulation Study for Uncertainty Evaluation in Turbulent Statistics Obtained by Constant-Temperature Anemometry Reviewed

Kenji Fujita, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 1324 012068 - (8 pages) 2019.10

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Papers - Suzuki Hiroki