Zobrazeno 1 - 10
of 217
pro vyhledávání: '"Michihisa TSUTAHARA"'
Autor:
Masahiko SAKAMOTO, Michihisa TSUTAHARA
Publikováno v:
Journal of Fluid Science and Technology, Vol 13, Iss 3, Pp JFST0016-JFST0016 (2018)
The purpose of this study is to develop a high performance propulsive mechanism with high efficiency at high sailing speed by using a mechanism of rotary reciprocating wing motion based on the two-dimensional Weis-Fogh model. The sailing tests by bot
Externí odkaz:
https://doaj.org/article/743bd4617cfd4af5a6a9371c37296ca3
Autor:
Masahiko SAKAMOTO, Michihisa TSUTAHARA
Publikováno v:
Journal of Fluid Science and Technology, Vol 12, Iss 2, Pp JFST0017-JFST0017 (2017)
A two-dimensional ship propulsion model using the Weis-Fogh mechanism is analyzed by the potential flow theory and the conformal mapping. The purpose of this study is to clarify the most effective operating condition in which the loss is minimum. The
Externí odkaz:
https://doaj.org/article/3f337fa260284e5995319d22a7b649c7
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 82, Iss 840, Pp 16-00204-16-00204 (2016)
The resolution and efficiency of the finite-difference lattice Boltzmann method (FDLBM) is improved to deal with wall-bounded turbulence, which is characterized by the strong shear and anisotropy. FDLBM puts the merit of LBM, which is the explicit an
Externí odkaz:
https://doaj.org/article/fca2222f05364fc3a173a046ac013ced
Autor:
Masayuki HIRAISHI, Michihisa TSUTAHARA
Publikováno v:
Journal of Fluid Science and Technology, Vol 3, Iss 1, Pp 80-89 (2008)
Three-dimensional turbulent flows past a square cylinder are simulated by the Finite Difference Lattice Boltzmann Method (FDLBM). We carry out the simulation in two approaches. First, we carry it out using fourth order numerical viscosity without any
Externí odkaz:
https://doaj.org/article/743fe8be683d4461bce4e998408251dc
Autor:
Shinsuke TAJIRI, Michihisa TSUTAHARA, Kazuhiko OGAWA, Masahiko SAKAMOTO, Masakazu TAJIMA, Keisuke AZUMA
Publikováno v:
Journal of Fluid Science and Technology, Vol 3, Iss 1, Pp 43-55 (2008)
An experimental study was conducted by performing pressure measurements and flow visualization to investigate unsteady flows inside a two-dimensional semi-open-type nozzle in a ship propulsion equipment directly driven by high-pressure gas. We found
Externí odkaz:
https://doaj.org/article/b86243e41ed7471ea528f2ea712883f3
Publikováno v:
Journal of Fluid Science and Technology, Vol 2, Iss 3, Pp 582-591 (2007)
Three-dimensional homogeneous isotropic turbulence is simulated using the finite difference lattice Boltzmann method (FDLBM). First, we analyze the characteristics of numerical viscosity of FDLBM, and present a method in which the numerical viscosity
Externí odkaz:
https://doaj.org/article/0f89cfd098ed4eeea839eab83abc33bb
Autor:
Michihisa TSUTAHARA, Kazuhiko OGAWA, Masahiko SAKAMOTO, Takahiro MATSUI, Shinsuke TAJIRI, Masakazu TAJIMA, Hiroki YOKOYAMA
Publikováno v:
Journal of Fluid Science and Technology, Vol 2, Iss 1, Pp 120-129 (2007)
The flow inside the two-dimensional semi-open-type nozzle for ship propulsion equipment, directly driven by high-pressure gas was investigated experimentally. The flow was unsteady and the gas and water phases clearly separated. We found that these w
Externí odkaz:
https://doaj.org/article/e454bcf4bfd84322bcf1648d9d34d906
Publikováno v:
Journal of Fluid Science and Technology, Vol 2, Iss 1, Pp 35-44 (2007)
An improved finite difference lattice Boltzmann method (FDLBM) is developed to simulate incompressible flows. The basic idea is to decrease the density fluctuation which might lead to compressible error in the flows with high pressure gradient or hig
Externí odkaz:
https://doaj.org/article/80d3f55c4a674ed4be77aa2b00610e85
Publikováno v:
Journal of Fluid Science and Technology, Vol 10, Iss 1, Pp JFST0009-JFST0009 (2015)
The characteristics of a straight-bladed Darrieus turbine (Gyro-mill turbine) with elastic blades are experimentally studied. The same structured turbine with rigid blades is also studied for comparison. The turbine with elastic blads is shown to hav
Externí odkaz:
https://doaj.org/article/d35443308cbb47b1843101a2a60fd2db
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 81, Iss 825, Pp 14-00467-14-00467 (2015)
We studied sound generated by a diagonally arranged fin in a uniform flow. We set 2-dimensional computational model which neglected spanwise effect of the fins, and performed direct simulation of aerodynamic sound for two types of fins whose differen
Externí odkaz:
https://doaj.org/article/4feebfbfe272410c83bbf609bb16cc7c