2022 Fiscal Year Final Research Report
Clarification of mechanism of the interaction between turbulence and solidification structure and development of prediction methods for residual stress by DNS
| Project/Area Number |
20K04261
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | University of Fukui |
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Principal Investigator |
Ohta Takashi 福井大学, 学術研究院工学系部門, 准教授 (10273583)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 乱流 / 液体金属 / 凝固 / 溶融 / 非ニュートン粘性流体 / 直接数値シミュレーション / データベース / 乱流モデル |
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| Outline of Final Research Achievements |
By combining direct numerical simulation of turbulent flow and the phase field method for predicting solid-liquid phase changes, we achieved high-precision numerical analysis of supercooled solidifying turbulence. We then organized the simulation results into a database of flow fields and worked to understand the mechanism of complex phenomena involving the interaction of flowing liquids and solids. Based on the mechanism, we developed a large eddy simulation analysis method, that is, a turbulence model to predict the modulation of turbulence, and also investigated the method to predict the microstructure of the material-mechanical defects formed inside the solid after solidification.
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| Free Research Field |
流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
乱流の直接数値シミュレーションの技術を発展させて、流動現象の予測から固体内部の欠陥の構造の予測と制御を実現するために、相変化を伴う固液相に関する複雑現象のメカニズムの解明に取り組んだ。その結果として、材料力学的な問題を解決するために、流体の複雑現象を予測する乱流モデルの改良の指針が得られた。さらに、凝固組織構造の観察に関する実験成果を援用することによって、流体工学と材料力学の研究分野の協力と今後の新しい複合的研究分野のきっかけとなった。
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