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Title: 水滴衝突による砂粒子群侵食量の3次元並列計算
Other Titles: 3D PARALLEL COMPUTATIONS FOR TRANSPORTATION OF SAND PARTICLES DUE TO IMPACT OF A WATER-DROP
Authors: 柳生, 大輔  KAKEN_name
牛島, 省  kyouindb  KAKEN_id
鳥生, 大祐  kyouindb  KAKEN_id
青木, 一真  KAKEN_name
Author's alias: YAGYU, Daisuke
USHIJIMA, Satoru
TORIU, Daisuke
AOKI, Kazuma
Keywords: sand particle transportation
water-drop impact
multiphase model
parallel computation
Issue Date: 2015
Publisher: 土木学会
Journal title: 土木学会論文集A2(応用力学)
Volume: 71
Issue: 2
Start page: I_369
End page: I_378
Abstract: 本研究では, 3次元固気液多相場の解法(MICS) を用いて, 水滴落下により生ずる個々の砂粒子の運動の数値計算を行った. 本計算手法では, 流体と砂粒子間の力学相互作用と砂粒子間の接触力が考慮されている. 水滴の落下速度を変化させて, 約3万個の砂粒子から構成される砂粒子群の挙動を計算した結果, 既往の実験結果と同様に, 水滴の運動量が増加するにつれて砂粒子の再配置によるくぼみ領域の体積が増大することを確認した. さらに, 水滴形状を実験条件に近い回転楕円体とした場合には, くぼみ領域の体積が減少して実験結果に近づくことを確認した. 最後に, 並列化効率を調べた結果, 400 並列の計算速度は, 25 並列の場合の約8 倍となり, 本計算手法は多数の砂粒子の運動を計算する大規模計算に対して有効であることを示した.
This paper discusses the movements and rearrangements of about 30, 000 sand particles due to the impact of a water-drop using a multiphase computational method (MICS) parallelized with MPI. The computational method can deal with the movements and collisions of individual sand particles as well as the mechanical interaction between fluids and sand particles. The amounts of the removed volumes, which had been occupied by sand particles, due to the impact were calculated by varying the momentums and shapes of the water-drop. As a result, it was shown that the calculated results are in good agreement with the experiments and that the computation time is shortened by the parallel computations.
Rights: © 公益社団法人 土木学会/Japan Society of Civil Engineers
URI: http://hdl.handle.net/2433/229512
DOI(Published Version): 10.2208/jscejam.71.I_369
Related Link: https://ci.nii.ac.jp/naid/130005128800/
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