Fluid Engineering Laboratory

Y. Nakanishi

Yuji Nakanishi
(Professor)

Office: 5-225 Ext.: 3121

e-mail:  nakanishi@kanagawa-u.ac.jp

12/1993, Ph.D., Yokohama National University

03/1990, M.Eng., Yokohama National University

Y. Funami

Yuki Funami
(Assistant Professor)

Laboratory: 5-222 Ext.: 3120

e-mail:  funami-yuki@kanagawa-u.ac.jp

03/2014, Ph.D. in Eng., The University of Tokyo

03/2014, Ph.D. in Eng., The University of Tokyo

Research Field

Y. Nakanishi: Fluid Engineering, Computational Fluid Dynamics.

Y. Funami: Rocket Engineering, Fluid Dynamics.

Research Overview

Development and applications of numerical analysis methods for flow with vortices and free surfaces. Development of numerical evaluation methods for hybrid rocket internal ballistics.

Research Subjects

  • 1.Studying jet interactions in multi-nozzle Pelton turbines.
  • 2.Studying flow in Turgo impulse turbines.
  • 3.Analyzing vortex flow with the vortex method.
  • 4.Analyzing flow in hybrid rocket engines.

Introduction:

Study of Hydroelectric Power

We study flow characteristics in hydraulic turbines to improve their performance. Figure 1 shows the apparatus and the numerical results for a Turgo impulse turbine.

Analysis of Vortex Flow

We research numerical simulations of vortex flow at high Reynolds numbers by using a vortex method that does not require computational grids. Figure 2 shows the numerical results for simulating the oscillations of the cylinder in uniform flow. The vortex distribution is different from the Kármán vortex street.

Analysis of Flow in Hybrid Rocket Engines

We investigate methods for evaluating internal ballistics of hybrid rockets. We performed low-cost simulations with a one-dimensional flow model and two-dimensional simulations of boundary layer combustion (Fig. 3).

Publications
  • 1) B. Huang, Y. Nakanishi and T. Kanemoto, Numerical and experimental analysis of a counter-rotating type horizontal-axis tidal turbine, Journal of Mechanical Science and Technology, Vol.30, No.2, pp.499-505, (2016).
  • 2) Y. Nakanishi and M. Kobayashi “Flow affected by jet interference in a Pelton turbine,” Proceedings of Grand Renewable Energy, 2014, CD-ROM, O-Sh-5-4 (Tokyo, 2014-7).
  • 3) Y. Nakanishi, S. Iio, Y. Takahashi, A. Kato and T. Ikeda, “Development of a simple impulse turbine for nano hydropower,” Journal of Fluid Science and Technology, vol. 4(3), pp. 567–577 (2009).
  • 4) Y. Nakanishi, T. Fujii and S. Kawaguchi, “Numerical and experimental investigations of the flow in a stationary Pelton bucket,” Journal of Fluid Science and Technology, vol. 4(3), pp. 490–499 (2009).
  • 5) Y. Funami and T. Shimada, “Combined analysis of reactive flow and heat transfer for hybrid rocket design engineering,” 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, AIAA 2014-3456 (Cleveland, 2014-7)
Affiliated Academic Organizations

Y. Nakanishi:
Japan Society of Mechanical Engineers, Turbomachinery Society of Japan, IAHR, Japan Society of Fluid Mechanics.

Y. Funami:
Japan Society for Aeronautical and Space Sciences, American Institute of Aeronautics and Astronautics, Japanese Rocket Society, Combustion Society of Japan, Turbomachinery Society of Japan.

Current members
◯ Professors: 1 ◯ Assistant Professors: 1
◯ Undergraduates: 13

Facilities: GPU-based parallel computing system, Turgo impulse turbine, water jet assembly

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