Faculty Profiles - Suzuki Hiroki

Papers - Suzuki Hiroki

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Apparent exponential decay characteristics of dynamic and static pressure fluctuations in the multiscale-generated turbulence on the center line Reviewed

Hiroki Suzuki

(全文査読付) AIP Conference Proceedings 2872 120087 - (8 pages) 2023.9

Comparative validation of sub-grid scale models with converging zero/non-zero value in the laminar flow using Reynolds number dependence of an unsteady turbulence field Reviewed

Naoyuki Iwata, Hiroki Suzuki, Shinsuke Mochizuki

(全文査読付) AIP Conference Proceedings 2872 120039 - (8 pages) 2023.9

LES analysis on the impact of isotropically reduced spatial resolution of viscous terms on an anisotropic homogeneous turbulence field Reviewed

Riku Hirabayashi, Hiroki Suzuki, Shinsuke Mochizuki

(全文査読付) AIP Conference Proceedings 2872 120029 - (9 pages) 2023.9

Low-order isotropic spatial resolution characteristics of the viscous terms for LES analysis on iso/anisotropic steady turbulent flows Reviewed

Riku Hirabayashi, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2591 012019 - (12 pages) 2023.9

LES analysis clarifying the response of static pressure fluctuation characteristics in isotropic/anisotropic steady turbulence field to reducing isotropic small-scale spatial resolution Reviewed

Riku Hirayabashi, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2585 012006 - (13 pages) 2023.9

Examination of the Initial Field Dependence of the Decay Exponent Value of Decaying Turbulence using a Large-Eddy Simulation and a Wind Tunnel Experiment Reviewed

Advanced Experimental Mechanics

8 17 - 24 2023.8

Fundamental numerical analysis clarifying the response of incompressible turbulence fields to the uncertainty of kinetic energy conservation Reviewed

Makoto Chitose, Hiroki Suzuki, Kento Tanaka, Toshinori Kouchi

(全文査読付) Proceedings of the International Conference on Power Engineering 2023 (ICOPE-2023) ICOPE-2023-1274 - (4 pages) 2023.5

Examination of multi-scale generated decaying turbulence validated for the influence of wind tunnel blockage Reviewed

HIroto Yamaguchi, Hiroki Suzuki, Kento Tanaka, Toshinori Kouchi

(全文査読付) Proceedings of the International Conference on Power Engineering 2023 (ICOPE-2023) ICOPE-2023-1268 - (4 pages) 2023.5

Validation on the mean friction velocity of an atmospheric boundary layer flow reproduced by large-eddy simulation in terms of kinetic energy conservation Reviewed

Hiroki Suzuki, Yutaka Hasegawa

Journal of Physics: Conference Series 2369 012017 - (11 pages) 2022.11

Uncertainty evaluation due to the difference in definitions of the acceleration parameter to examine the influence of mean flow acceleration on the experimental turbulent flows Reviewed

Takanari Kashiwagi, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2369 012012 - (10 pages) 2022.11

Numerical visualisation on the impact of setting convective velocity of outflow boundary on a parallel grid-generated flow Reviewed

Hiroki Suzuki

Journal of Physics: Conference Series 2369 012021 - (10 pages) 2022.11

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 012001 - (7 pages) 2022.8

Numerical visualisation on applying a five-stage multi-scaled square turbulence-generating grid to generating turbulence Reviewed

Hiroki Suzuki

Journal of Physics: Conference Series 2313 012005 - (10 pages) 2022.8

Development of a single-scale initial flow field into steady homogeneous turbulence with validating a constructed Fourier spectral analysis Reviewed

Hiroki Suzuki, Toshinori Kouchi

Journal of Physics: Conference Series 2313 012008 - (16 pages) 2022.8

Effect of LEBU on the wall shear stress in a two-dimensional turbulent channel flow Reviewed

Shinsuke MOCHIZUKI, Takatsugu KAMEDA, Hiroki SUZUKI

Transactions of the JSME (in Japanese) 88 ( 910 ) 22-00059 2022.6

Impact of the kinetic energy conservation on unsteady homogeneous turbulence Reviewed

(peer-reviewed) Proceedings of the 7th International Conference on Jets, Wakes and Separated Flows 2022 (ICJWSF2022) paper No. ICJWSF2022-B01 - (8 pages) 2022.3

Numerical-model-based experiment for estimating effects of local weak mean acceleration on the decaying multiscale-generated turbulence Reviewed

(peer-reviewed) Proceedings of the 32nd International Symposium on Transport Phenomena (ISTP32) paper No. 22 - (5 pages) 2022.3

Uncertainty evaluation due to the difference in definitions of the acceleration parameter to examine the influence of mean flow acceleration on the experimental turbulent flows

Takanari Kashiwagi, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2369 ( 1 ) 2022

Impact of difference between explicit and implicit second-order time integration schemes on isotropic/anisotropic steady incompressible turbulence field Reviewed

Ryuma Honda, Hiroki Suzuki, Shinsuke Mochizuki

Journal of Physics: Conference Series 2090 ( 1 ) 012145 - (8 pages) 2021.12

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

<title>Abstract</title>
This study presents the impact of the difference between the implicit and explicit time integration methods on a steady turbulent flow field. In contrast to the explicit time integration method, the implicit time integration method may produce significant kinetic energy conservation error because the widely used spatial difference method for discretizing the governing equations is explicit with respect to time. In this study, the second-order Crank-Nicolson method is used as the implicit time integration method, and the fourth-order Runge-Kutta, second-order Runge-Kutta and second-order Adams-Bashforth methods are used as explicit time integration methods. In the present study, both isotropic and anisotropic steady turbulent fields are analyzed with two values of the Reynolds number. The turbulent kinetic energy in the steady turbulent field is hardly affected by the kinetic energy conservation error. The rms values of static pressure fluctuation are significantly sensitive to the kinetic energy conservation error. These results are examined by varying the time increment value. These results are also discussed by visualizing the large scale turbulent vortex structure.

DOI： 10.1088/1742-6596/2090/1/012145

researchmap

Other Link： https://iopscience.iop.org/article/10.1088/1742-6596/2090/1/012145/pdf

Attempt to quantify the impact of seasonal air density variation on operating tip-speed ratio of small wind turbines Reviewed

Hiroki Suzuki, Yutaka Hasegawa, O.D. Afolabi Oluwasola, Shinsuke Mochizuki

Journal of Physics: Conference Series 2090 ( 1 ) 012144 - (8 pages) 2021.12

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

<title>Abstract</title>
This study presents the impact of seasonal variation in air density on the operating tip-speed ratio of small wind turbines. The air density, which varies depending on the temperature, atmospheric pressure, and relative humidity, has an annual amplitude of about 5% in Tokyo, Japan. This study quantified this impact using the rotational speed equation of motion in a small wind turbine informed by previous work. This governing equation has been simplified by expanding the aerodynamic torque coefficient profile for a wind turbine rotor to the tip-speed ratio. Furthermore, this governing equation is simplified by using nondimensional forms of the air density, inflow wind velocity, and rotational speed with their characteristic values. In this study, the generator’s load is set to be constant based on a previous analysis of a small wind turbine. By considering the equilibrium between the aerodynamic torque and the load torque of the governing equation at the optimum tip-speed ratio, the impact of the variation in the air density on the operating tip-speed ratio was expressed using a simple mathematical form. As shown in this derived form, the operating tip-speed ratio was found to be less sensitive to a variation in air density than that in inflow wind velocity.

DOI： 10.1088/1742-6596/2090/1/012144

researchmap

Other Link： https://iopscience.iop.org/article/10.1088/1742-6596/2090/1/012144/pdf

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Papers - Suzuki Hiroki