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Journal Articles

Coherent eddies transporting passive scalars through the plant canopy revealed by Large-Eddy simulations using the lattice Boltzmann method

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:1 Percentile:37.23(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.

Journal Articles

Monte Carlo criticality analysis under material distribution uncertainty

Ueki, Taro

Journal of Nuclear Science and Technology, 54(3), p.267 - 279, 2017/03

 Times Cited Count:6 Percentile:60.4(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$$_{rm eff}$$) under random spatial variation can depart significantly from the k$$_{rm eff}$$ of a reference uniform medium. It is also shown that the deterministic modeling provides an upper-bound measure for extreme results from random realizations.

JAEA Reports

Water jet intrusion into hot melt concomitant with direct-contact boiling of water

Shibamoto, Yasuteru

JAERI-Research 2005-016, 127 Pages, 2005/08

JAERI-Research-2005-016.pdf:4.54MB

no abstracts in English

Journal Articles

Problem Solving Environment for supporting large-sclae simulation

Ueshima, Yutaka

PSE Book, p.69 - 82, 2005/03

no abstracts in English

Journal Articles

Accurate basis set by the CIP method for the solutions of the schr$"o$dinger equation

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:52.51(Computer Science, Interdisciplinary Applications)

no abstracts in English

Journal Articles

Formation of a charge-exchange target for fast ions in the plasma of large-scale toroidal devices under NBI conditions

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.

JAEA Reports

A Probabilistic assessment code system for derivation of clearance levels of radioactive materials; PASCLR user's manual

Takahashi, Tomoyuki*; Takeda, Seiji; Kimura, Hideo

JAERI-Data/Code 2000-041, 108 Pages, 2001/01

JAERI-Data-Code-2000-041.pdf:4.86MB

no abstracts in English

Journal Articles

Ab initio molecular dynamics for simple liquid metals based on the hypernetted-chain approximation

; Chihara, Junzo

Molecular Simulation, 16, p.31 - 46, 1996/00

 Times Cited Count:3 Percentile:13.95(Chemistry, Physical)

no abstracts in English

Journal Articles

Extraction of the bridge function for simple liquids from a molecular dynamics simulation and its application for correcting the pair distribution function

; Chihara, Junzo

Physical Review E, 50(2), p.1317 - 1324, 1994/08

 Times Cited Count:26 Percentile:73.99(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Effective interatomic interactions in liquid metals

Chihara, Junzo; *

Molecular Simulation, 12(3-6), p.187 - 195, 1994/00

 Times Cited Count:3 Percentile:15.24(Chemistry, Physical)

no abstracts in English

Journal Articles

Numerical calculation of the bridge function for soft-sphere supercooled fluids via molecular dynamics simulations

; *

Molecular Simulation, 12(3-6), p.421 - 430, 1994/00

 Times Cited Count:3 Percentile:15.24(Chemistry, Physical)

no abstracts in English

Journal Articles

Ionic and electronic correlations in liquid potassium from the electron-nucleus model

*; Chihara, Junzo

Journal of Physics; Condensed Matter, 5, p.4315 - 4324, 1993/00

 Times Cited Count:7 Percentile:43.04(Physics, Condensed Matter)

no abstracts in English

JAEA Reports

JAEA Reports

Solutions to NEANSC benchmark problems on Power Distribution within Assemblies(PDWA) using the SRAC and GMVP

Kugo, Teruhiko; Nakakawa, Masayuki;

JAERI-M 92-117, 70 Pages, 1992/08

JAERI-M-92-117.pdf:1.39MB

no abstracts in English

Journal Articles

Comments on transport phenomena of ionic liquids

; Furukawa, Kazuo

First Inter.Symp.on Molten Salt Chem.Technol.,J-315, p.449 - 452, 1983/00

no abstracts in English

Journal Articles

RDF analysis for the degree of interchain ordering in amorphous solid polyethylene

; Kuriyama, Isamu; *

Journal of Applied Physics, 49(11), p.5468 - 5472, 1978/00

 Times Cited Count:16

no abstracts in English

Journal Articles

Radial distribution functions and bound electronic energy levels in hydrogen plasmas

Progress of Theoretical Physics, 60(6), p.1640 - 1652, 1978/00

 Times Cited Count:14

no abstracts in English

Journal Articles

Calculation of pair correlations in a degenarate electron liquid

Progress of Theoretical Physics, 53(2), p.400 - 410, 1975/02

 Times Cited Count:9

no abstracts in English

Journal Articles

Application of paracrystalline-lattice theory to the analysis of the radial distribution function of amorphous region in polyethylene

*; *; ; Kuriyama, Isamu

Reports on Progress in Polymer Physics in Japan, 18, p.207 - 210, 1975/00

no abstracts in English

25 (Records 1-20 displayed on this page)