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Wakui, Takashi; Takagishi, Yoichi*; Futakawa, Masatoshi
Materials, 16(17), p.5830_1 - 5830_16, 2023/09
Times Cited Count:0 Percentile:0(Chemistry, Physical)Cavitation damage on the mercury target vessel is induced by proton beam injection in mercury. The prediction method of the cavitation damage using Monte Carlo simulations was proposed taking into account of the uncertainties of the position of cavitation bubbles and impact pressure distributions. The distribution of impact pressure attributed to individual cavitation bubble collapsing was assumed to be the Gaussian distribution, and the probability distribution of the maximum value of impact pressures was assumed to be three kinds of distributions; the delta function, the Gaussian and Weibull distributions. Two parameters were estimated using Bayesian optimization by comparing the distribution of the cavitation damage obtained from experiment with that of accumulated plastic strain obtained from the simulation. It was found that the results obtained using the Weibull distribution reproduced the actual cavitation erosion phenomenon better than the other results.
Im, S.*; Jee, H.*; Suh, H.*; Kanematsu, Manabu*; Morooka, Satoshi; Choe, H.*; Nishio, Yuhei*; Machida, Akihiko*; Kim, J.*; Lim, S.*; et al.
Construction and Building Materials, 365, p.130034_1 - 130034_18, 2023/02
Times Cited Count:6 Percentile:65.14(Construction & Building Technology)Watanabe, Tsutomu*; Takagi, Marie*; Shimoyama, Ko*; Kawashima, Masayuki*; Onodera, Naoyuki; Inagaki, Atsushi*
Boundary-Layer Meteorology, 181(1), p.39 - 71, 2021/10
Times Cited Count:6 Percentile:44.03(Meteorology & Atmospheric Sciences)A double-distribution-function lattice Boltzmann model for large-eddy simulations of a passive scalar field is described within and above a plant canopy. For a top-down scalar, for which the plant canopy serves as a distributed sink, the flux of the scalar near the canopy top are predominantly determined by sweep motions originating far above the canopy. By contrast, scalar ejection events are induced by coherent eddies generated near the canopy top. In this paper, the generation of such eddies is triggered by the downward approach of massive sweep motions to existing wide regions of weak ejective motions from inside to above the canopy.
Ueki, Taro
Journal of Nuclear Science and Technology, 54(3), p.267 - 279, 2017/03
Times Cited Count:8 Percentile:60.68(Nuclear Science & Technology)Analysis framework under material distribution uncertainty is investigated for the Monte Carlo (MC) criticality calculation of continuously mixed media formed via molten core concrete interaction. Deterministic trigonometric functions and randomized Weierstrass functions are utilized to represent the spatially continuous variation. Numerical results indicate that the effective multiplication factor (k) under random spatial variation can depart significantly from the k of a reference uniform medium. It is also shown that the deterministic modeling provides an upper-bound measure for extreme results from random realizations.
Shibamoto, Yasuteru
JAERI-Research 2005-016, 127 Pages, 2005/08
no abstracts in English
Ueshima, Yutaka
PSE Book, p.69 - 82, 2005/03
no abstracts in English
Utsumi, Takayuki*; Yabe, Takashi*; Koga, J. K.; Aoki, Takayuki*; Sekine, Masatoshi*
Computer Physics Communications, 157(2), p.121 - 138, 2004/02
Times Cited Count:13 Percentile:51.42(Computer Science, Interdisciplinary Applications)no abstracts in English
Mironov, M. I.*; Khudoleev, A. V.*; Kusama, Yoshinori
Plasma Physics Reports, 30(2), p.164 - 168, 2004/02
Times Cited Count:0 Percentile:0.02(Physics, Fluids & Plasmas)High-energy charge-exchange diagnostics can determine the distribution function of fast atoms produced via the neutralization of hydrogen ions by hydrogen-like impurity ions. Deriving the distribution function requires to know the composition and spatial distribution of the target ions in a plasma. A charge-exchange target forms as a result of the interaction between impurity nuclei and beam atoms. Depending on the arrangement of heating beams with respect to the diagnostics, it is necessary to calculate their trajectories. A model which takes into account elementary processes resulting in the ionization equilibrium of the ions of impurities in a specific tokamak configuration is proposed. The model is applied to the JT-60U plasma. Mechanisms for the formation of charge-exchange atomic flows are considered. The relative contributions of different heating injectors to the charge-exchange flow are estimated. Based on the calculated results, a method is proposed for local measurements of the ion distribution function with a stationary analyzer.
Takahashi, Tomoyuki*; Takeda, Seiji; Kimura, Hideo
JAERI-Data/Code 2000-041, 108 Pages, 2001/01
no abstracts in English
; Chihara, Junzo
Molecular Simulation, 16, p.31 - 46, 1996/00
Times Cited Count:4 Percentile:17.29(Chemistry, Physical)no abstracts in English
; Chihara, Junzo
Physical Review E, 50(2), p.1317 - 1324, 1994/08
Times Cited Count:28 Percentile:74.82(Physics, Fluids & Plasmas)no abstracts in English
Chihara, Junzo; *
Molecular Simulation, 12(3-6), p.187 - 195, 1994/00
Times Cited Count:3 Percentile:14.83(Chemistry, Physical)no abstracts in English
; *
Molecular Simulation, 12(3-6), p.421 - 430, 1994/00
Times Cited Count:3 Percentile:14.83(Chemistry, Physical)no abstracts in English
*; Chihara, Junzo
Journal of Physics; Condensed Matter, 5, p.4315 - 4324, 1993/00
Times Cited Count:7 Percentile:42.57(Physics, Condensed Matter)no abstracts in English
JAERI-M 92-181, 126 Pages, 1992/12
no abstracts in English
Kugo, Teruhiko; Nakakawa, Masayuki;
JAERI-M 92-117, 70 Pages, 1992/08
no abstracts in English
; Furukawa, Kazuo
First Inter.Symp.on Molten Salt Chem.Technol.,J-315, p.449 - 452, 1983/00
no abstracts in English
; *;
JAERI-M 8757, 41 Pages, 1980/03
no abstracts in English
; Kuriyama, Isamu; *
Journal of Applied Physics, 49(11), p.5468 - 5472, 1978/00
Times Cited Count:17no abstracts in English
Progress of Theoretical Physics, 60(6), p.1640 - 1652, 1978/00
Times Cited Count:14no abstracts in English