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Title: 礫間および礫・流体間の力学連成を考慮した越流水による礫群輸送の数値計算
Other Titles: COMPUTATIONS ON TRANSPORTATIONS OF GRAVEL PARTICLES DUE TO OVERFLOWS TAKING ACCOUNT OF PARTICLE-PARTICLE AND PARTICLE-FLUID MECHANICAL INTERACTIONS
Authors: 牛島, 省  kyouindb  KAKEN_id
鳥生, 大祐  kyouindb  KAKEN_id
柳, 博文  KAKEN_name
柳生, 大輔  KAKEN_name
Author's alias: USHIJIMA, Satoru
TORIU, Daisuke
YANAGI, Hirohumi
YAGYU, Daisuke
Keywords: fluid-solid interaction
multiphase model
parallel computation
local scour
gravel particle
overflow
Issue Date: 2017
Publisher: 土木学会
Journal title: 土木学会論文集A2 (応用力学) = Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics)
Volume: 73
Issue: 2
Start page: I_377
End page: I_386
Abstract: 本研究では, 切欠き堰を越流して落下する水流により, 堰下流側に平滑に敷き詰められた平均粒径約7 mm, 個数約16, 700の礫群が輸送され, 洗掘・堆積する過程の数値計算を行い, 実験結果と比較した. 数値計算では, 代表的な26種類の礫形状を抽出し, それらを四面体要素で表現し, 礫間の接触を扱える礫モデルを用いた. また, 礫に作用する流体力は, 多相場の運動方程式の圧力項と粘性項の体積積分から求め, 礫の運動量を多相場に反映させることで礫と流体の力学連成を考慮する. 最初に, 水中で直方体状に初期配置された礫群を崩壊させる実験と数値計算を行い, 本研究の礫モデルが有効であることを確認した. 次に, 越流水による礫群輸送の計算を行い, 礫群の洗掘・堆積形状などを計測結果と定量的に比較し, 数値解法の適用性を考察した.
A parallel computation method with a multiphase model was applied to the local scour and deposition of a gravel bed, consisting of about 16, 700 gravel particles with a diameter of around 7 mm, caused by falling overflows over a rectangular-notch weir. In the computations, representative 26 shapes of gravel particles were modeled with tetrahedron elements and contact-detection spheres. The fluid forces acting on a gravel particle were estimated with the volume integral of the pressure and viscosity terms included in momentum equations for the multiphase field. Through the comparisons with experiments, the applicability of the present computational method was confirmed.
Rights: © 公益社団法人 土木学会/Japan Society of Civil Engineers
URI: http://hdl.handle.net/2433/229523
DOI(Published Version): 10.2208/jscejam.73.I_377
Appears in Collections:Journal Articles

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