2022 Fiscal Year Final Research Report
Numerical Simulation of Liquid Film Formation and Collapse Considering Adsorption, Desorption, and Viscoelasticity of Surfactants by AMR Method
| Project/Area Number |
20K22388
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2020-09-11 – 2023-03-31
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| Keywords | 液膜シミュレーション / AMR / 複数GPU / 界面活性剤 / 粘弾性流体 / 弱圧縮性流体計算 |
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| Outline of Final Research Achievements |
High-resolution simulations were performed for the liquid film to resolve even the flow inside the liquid film. Significant modifications to the surfactant transport equation on the interface were made to achieve high accuracy while ensuring concentration conservation. A viscoelastic model that can account for surfactant concentration and concentration inhomogeneity was also solved, and it was found that viscoelasticity can destabilize the liquid film by suppressing the Marangoni effect and prevent mechanical collapse by suppressing bubble deformation.
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| Free Research Field |
数値流体力学，計算力学
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| Academic Significance and Societal Importance of the Research Achievements |
界面活性剤濃度輸送と粘弾性の両者を考慮可能な計算手法が開発できたことで，数値計算で解明可能な気液二相流現象が広がり，流体力学における現象理解だけでなく，泡を使った洗浄などのいたるところで見られる現象に対する理解が大きく向上し，より流体力学的知見に基づいた設計が可能となる．例えばトランスミッションのギアボックス内の高回転時オイル攪拌ではほとんど泡沫状態となるが，オイルは潤滑・冷却の目的で用いられるため，泡沫の持つ断熱的性質が重要となる．液膜内流動を実験のみで計測・解明するには限界があり，数値計算によって液膜安定化・崩壊を伴う流動特性を解明できれば工学的に有用な知見を得ることができる．
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