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Whirl pool Tank analyse
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Masami Kadonaga
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WhilPoolTankAna. with OpenFOAM(multiPhaseEulerFoam)
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Whirl pool Tank analyse
1.
ワールプールタンクの原理 を考えよう 門永雅史 麦酒物理研究所 所長 ビール文化研究所 物理学分室
室長 OpenFOAMで 麦酒物理研究所はビール文化研究所のオマージュです http://bierreise.net/
2.
背景 ワールプールタンクとは 日本ビール検定公式テキスト(監修 日本ビール文化研究所)
3.
実験結果1 ワールプールタンク内を攪拌 タンクの中で麦汁がグルグルと回転 攪拌後に下からビールを排出 ⇒中央に凝集物が滞在 http://www.kirin.co.jp/entertainment/factory/yokohama/seminar/
4.
実験結果2 モデル実験 灰皿に水と生姜(凝集物やホップの代わり)を入れて軽く回転させる ⇒中央に生姜が集まってくる
5.
実験結果3 攪拌前 攪拌後 灰皿に水と生姜(凝集物やホップの代わり)を入れて軽く回転させる ⇒中央に生姜が集まってくる 生姜 生姜
6.
計算モデル ソルバー ・multiphaseEulerDymFoamを使う ・PETボトルを回転させる計算(Tornade)で考案した回転モデルを搭載 ●攪拌モデル1 内部流体のxy面に強制的に速度を与える(UEqn.Hを変更) ●攪拌モデル2 MRFによる回転モデルはタイムstepが小さくなりすぎてNG dynamicMeshによる回転モデルは加速度が働かない?
7.
境界条件 大気開放 壁 壁
8.
計算結果1 色分けは粒子体積分率
9.
計算結果2 流線表示(色分けは始点の違い)
10.
・遠心力で外側に向かった流れによって円周部分の圧力は高い ・底は壁と流体の摩擦によって流れが弱く圧力も小さい ⇒圧力差で上部の液体は下に流れ、次に中央に向かって流れ、再び上昇す るといった螺旋状循環した流れを形成(2次流れ) ⇒粒子は遠心力で底の外側に集まるが、2次流れによって最後は中央に集まる 考察
11.
結論 回転した流体中の粒子は2次流れに よって中央に集められる 今後の展開 安息角の考慮(ビンガム) SRF、MRF、dynamicMeshによる計算
12.
参考文献
13.
MRFによる計算 おまけ timeStepが小さくなりNG MRFは定常計算のみ? SRFならうまくいくのか? 流体が回転しない? dynamicMeshによる計算
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