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水とペットボトルの連成運動
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日本アムスコ
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LS-Dynaを使って、水とペットボトルの連成運動をシミュレーションしてみました
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水とペットボトルの連成運動
1.
水とペットボトルの 連成運動 日本アムスコ
2.
きっかけ 「SPHを用いた解析をしてみたい」 Smooth Particle Hydrodynamicsの略、流体の飛散など超 大変形解析に用いられる解析手法。
粒子法に属する。 SPHとは… • 粒子は結合がないため自由に動き回れる • 影響半径内にある粒子のもつ物理量から 評価点の物理量を内挿 • 空間に固定されたメッシュの小部屋に物理 量が出入りするイメージ Euler Mesh粒子法
3.
解析対象 • 水の入ったペットボトルを指ではじく 1 2
3 4 5 6
4.
解析モデル(1/2) Water Bottle Finger (Shell element ) Number
of elements : 1100 *MAT_ELASTIC (SPH element ) Number of elements : 2700 *MAT_NULL + *EOS (Shell element) *MAT_RIGID 210mm *ELEMENT_MASS 2.5 g Cap
5.
解析モデル(2/2) *BOUNDARY_PRESCRIBED_MOTION *RIGIDWALL 接触 Bottle vs. Finger Water
vs. Bottle 重力 *CONTACT_AUTO_NODES_TO_SURF *CONTACT_AUTO_SURF_TO_SURF LS-DYNA Version : smp R8.0.0 (double) Revision: 95309 *LOAD_BODY 強制変位 床
6.
Contours of density
(g/cm3 ) 解析結果(1/2) 1 2 3
7.
解析結果(2/2) Contours of density
(g/cm3 ) 4 5 6
8.
まとめ SPHによる解析の結果 • 流体特有の動きと重心移動を再現 • 全体として『起き上がり子法師』の挙動 課題 •
解析の正しさを担保する • 流体・現象の知見を深める
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