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KAKEN_18K03935seika.pdf
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Title |
Title |
量子乱流と常流体乱流の結合計算による2流体乱流の特性解明
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Kana |
リョウシ ランリュウ ト ジョウリュウタイ ランリュウ ノ ケツゴウ ケイサン ニ ヨル 2リュウタイ ランリュウ ノ トクセイ カイメイ
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Ryōshi ranryū to jōryūtai ranryū no ketsugō keisan ni yoru 2ryūtai ranryū no tokusei kaimei
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Investigation of the two-fluid turbulence characteristics by coupled simulation between quantum turbulence and normal-fluid turbulence
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小林, 宏充
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コバヤシ, ヒロミチ
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Kobayashi, Hiromichi
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慶應義塾大学・法学部 (日吉) ・教授
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Research team head
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科研費研究者番号 : 60317336
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坪田, 誠
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ツボタ, マコト
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Tsubota, Makoto
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大阪市立大学・大学院理学研究科・教授
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Research team member
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科研費研究者番号 : 10197759
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2021
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科学研究費補助金研究成果報告書
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2020
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極低温の液体ヘリウムは、粘性ゼロの超流体と粘性を持つ常流体が混合した2流体状態にある。2流体ともに層流、超流体が乱流(量子乱流)だが常流体が層流、2流体ともに乱流という状況が実験で得られているものの、その詳細は未解明のままである。そこで、相互摩擦力を介した2流体結合計算を開発・実施することで、それらの特性を解明する。超流体は量子化された渦糸、常流体は粘性をもつ連続体(粘性流体)として数値解析を行った。その結果、量子乱流との相互摩擦力による常流体の平坦化、助走区間の減少、層流常流体の非等方速度変動、2流体乱流での乱流強度の増強といった現象を解明した。
Cryogenic liquid helium is in a two-fluid state in which inviscid superfluid and viscous normal-fluid are mixed. Experiments have shown three states: (1) both fluids are laminar; (2) superfluid is turbulent (quantum turbulence), but normal-fluids is laminar; (3) both fluids are turbulent. However, the details remain unclear. Thus, we investigate those characteristics by developing and implementing a two-fluid coupled simulation via mutual friction. Numerical analysis was performed assuming that superfluid is quantized vortices and normal-fluid is a viscous continuum (viscous fluid). It was found that we revealed phenomena such as flattening of normal fluid due to mutual friction by quantum turbulence, reduction of entrance length, anisotropic velocity fluctuation of laminar normal-fluid, and enhancement of turbulent intensity in two-fluid turbulence.
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研究種目 : 基盤研究 (C) (一般)
研究期間 : 2018~2020
課題番号 : 18K03935
研究分野 : 流体力学
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