KAKEN — Research Projects | Researcher Number: 40608816

Search Results: 9 results / Researcher Number: 40608816

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1. 「教師なし学習」人工的画像生成を応用した時間・空間粗解像LESモデリングへの挑戦

Research Project

Research Category	Grant-in-Aid for Challenging Research (Exploratory)
Review Section	Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
Research Institution	Tohoku University
Principal Investigator	河合宗司東北大学, 工学研究科, 教授
Project Period (FY)	2024-06-28 – 2026-03-31Granted
Keywords	数値流体力学 / 機械学習 / LES / 乱流モデル / 乱流境界層
Outline of Research at the Start	複雑な乱流現象を高忠実に再現できるLES (Large-eddy simulation) は、流体機械の開発上流段階から信頼できる設計を可能としうる手法として、近年、産業界からの期待が大きくなってきている。一方、LESの活用を妨げている主要因はその高い計算コストにある。本研究では、機械学習による流れ ...

2. Coarse-grid LES modeling based on machine-learning-based super-resolution reconstruction of under-resolved LES flows

Research Project

Research Category	Grant-in-Aid for Challenging Research (Exploratory)
Review Section	Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
Research Institution	Tohoku University
Principal Investigator	Kawai Soshi 東北大学, 工学研究科, 教授
Project Period (FY)	2022-06-30 – 2024-03-31Completed
Keywords	数値流体力学 / 機械学習 / LES / 流体力学 / 乱流
Outline of Research at the Start	本研究では、高忠実な乱流シミュレーション、LES (Large-eddy simulation)の抜本的低コスト化を目指し、機械学習による画像生成技術を応用した流れの超解像再構成を活用し、再構成された流れの非解像成分が解像成分に与えるマルチスケール相互干渉効果を超粗格子LES方程式に導入する。これに ...
Outline of Final Research Achievements	This study investigated a coarse-grid subgrid-scale (SGS) model that can maintain prediction accuracy as large-eddy simulation (LES) even when using a ...

Research Products of this project	Presentation (9 results, of which Int'l Joint Research: 5 results)

3. Physical law and modeling of compressible separated flows using high-fidelity spatio-temporal large-scale data

Research Project

Research Category	Grant-in-Aid for Scientific Research (B)
Review Section	Basic Section 24010:Aerospace engineering-related
Research Institution	Tohoku University
Principal Investigator	Kawai Soshi 東北大学, 工学研究科, 教授
Project Period (FY)	2021-04-01 – 2024-03-31Completed
Keywords	乱流境界層 / 高レイノルズ数流れ / 圧縮性流体 / LES / データ駆動科学 / 圧縮性熱流体
Outline of Research at the Start	本研究では、航空機の性能や安全性に大きな影響を持つ圧縮性乱流境界層現象に対し、開発してきた高次精度・圧縮性流体解析コードと最新鋭のスパコンを駆使した大規模直接数値解析から、複雑流体現象を高忠実に再現する時空間大規模データベースを構築する。また構築する高忠実な大規模データベースの理論的およびデータ駆動 ...
Outline of Final Research Achievements	This study investigated a wall modeling in large-eddy simulation (LES) that enables high-fidelity simulations of compressible separated turbulent boun ...

Research Products of this project	Int'l Joint Research (1 results) Journal Article (6 results, of which Int'l Joint Research: 1 results, Peer Reviewed: 6 results, Open Access: 1 results) Presentation (26 results, of which Int'l Joint Research: 9 results)

4. Supercritical combustion modeling for large-eddy simulations

Research Project

Research Category	Grant-in-Aid for Scientific Research (B)
Review Section	Basic Section 24010:Aerospace engineering-related
Research Institution	Hokkaido University
Principal Investigator	Terashima Hiroshi 北海道大学, 工学研究院, 准教授
Project Period (FY)	2021-04-01 – 2024-03-31Completed
Keywords	超臨界流体 / 燃焼 / 非理想性 / 火炎モデル / ラージエディシミュレーション / LES火炎モデル / 詳細反応 / 超臨界圧燃焼 / LES解析 / 詳細反応機構 / 乱流燃焼モデル
Outline of Research at the Start	本研究は，航空宇宙推進器等で見られる超臨界圧環境下燃焼流れ場の高度予測を可能とする燃焼流体シミュレーション(燃焼CFD)技術の開発とその適用を目的とする．目指す開発技術の中心を，化学反応の理解に基づく燃焼制御及び予測技術と据え，それを可能とする詳細反応機構を適用した燃焼CFD技術を開発する．具体的に ...
Outline of Final Research Achievements	A novel numerical modeling for combustion flows under supercritical pressure conditions has been introduced, which uniquely incorporates real-fluid ef ...

Research Products of this project	Journal Article (4 results, of which Peer Reviewed: 4 results) Presentation (28 results, of which Int'l Joint Research: 9 results)

5. Challenges for high-fidelity turbulent combustion simulation based on detailed reaction mechanisms

Research Project

Research Category	Grant-in-Aid for Challenging Research (Exploratory)
Review Section	Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
Research Institution	Tohoku University
Principal Investigator	Kawai Soshi 東北大学, 工学研究科, 教授
Project Period (FY)	2019-06-28 – 2022-03-31Completed
Keywords	数値流体力学 / 詳細反応機構 / 燃焼 / 乱流 / 熱流体工学 / LES / 熱工学
Outline of Research at the Start	本研究では、乱流燃焼シミュレーションに対する物理的忠実度および予測精度の向上を目指し、物理的な視点に基づく時空間操作の概念を詳細反応機構に基づく乱流燃焼LES方程式に導入し、連成する乱流と化学反応を高忠実に再現する物理モデルの構築を試みる。これにより、詳細反応機構に基づく実燃焼器スケールの乱流燃焼L ...
Outline of Final Research Achievements	This study investigated a high-fidelity turbulent combustion LES method based on detailed reaction mechanisms that reproduce turbulent combustion phen ...

Research Products of this project	Journal Article (3 results, of which Open Access: 2 results, Peer Reviewed: 1 results) Presentation (7 results, of which Int'l Joint Research: 2 results)

6. Flow physics of Reynolds number effects and stress-balance modeling of inner-layer turbulence

Research Project

Research Category	Grant-in-Aid for Scientific Research (B)
Review Section	Basic Section 24010:Aerospace engineering-related
Research Institution	Tohoku University
Principal Investigator	Kawai Soshi 東北大学, 工学研究科, 教授
Project Period (FY)	2018-04-01 – 2021-03-31Completed
Keywords	乱流境界層 / 高レイノルズ数流れ / 数値流体力学 / LES / データ駆動科学 / 航空宇宙流体力学
Outline of Final Research Achievements	This study investigated inner-layer turbulence modeling (wall modeling) for high-fidelity LES at practical high Reynolds numbers. The flowfields consi ...

Research Products of this project	Int'l Joint Research (2 results) Journal Article (10 results, of which Int'l Joint Research: 1 results, Peer Reviewed: 8 results, Open Access: 1 results) Presentation (29 results, of which Int'l Joint Research: 8 results, Invited: 3 results)

7. An approach of modifying the governing equations in a physically-consistent manner for modeling of turbulent mixing and combustion

Research Project

Research Category	Grant-in-Aid for Challenging Exploratory Research
Research Field	Aerospace engineering
Research Institution	Tohoku University
Principal Investigator	Kawai Soshi 東北大学, 工学研究科, 准教授
Project Period (FY)	2015-04-01 – 2017-03-31Completed
Keywords	航空宇宙流体力学 / 数値流体力学 / 反応流 / 燃焼 / 詳細反応機構 / 熱工学 / 圧縮性流体
Outline of Final Research Achievements	In this study, an accurate and robust numerical modeling for simulating realistic chemically reacting flow problems using detailed chemical kinetics w ...

Research Products of this project	Journal Article (1 results) Presentation (2 results)

8. Dynamics of interactions between thermodynamic properties and wall turbulence in supercritical fluids and quantification of uncertainty

Research Project

Research Category	Grant-in-Aid for Young Scientists (A)
Research Field	Aerospace engineering
Research Institution	Tohoku University (2015-2017) Japan Aerospace Exploration Agency (2014)
Principal Investigator	Kawai Soshi 東北大学, 工学研究科, 准教授
Project Period (FY)	2014-04-01 – 2018-03-31Completed
Keywords	航空宇宙流体力学 / 数値流体力学 / 流体工学 / 超臨界流体 / 実在流体効果 / 乱流境界層 / DNS / 乱流モデル / 不確かさの定量化 / 実在流体
Outline of Final Research Achievements	In this study, an accurate and robust numerical method for simulating transcritical turbulent flows at supercritical pressure is proposed, and fully-d ...

Research Products of this project	Journal Article (3 results, of which Int'l Joint Research: 1 results, Peer Reviewed: 2 results, Acknowledgement Compliant: 2 results, Open Access: 1 results) Presentation (21 results, of which Int'l Joint Research: 5 results, Invited: 3 results)

9. Development of non-equilibrium wall-modeling for LES using uncertainty quantification method

Research Project

Research Category	Grant-in-Aid for Young Scientists (B)
Research Field	Aerospace engineering
Research Institution	Japan Aerospace Exploration Agency
Principal Investigator	KAWAI Soshi 独立行政法人宇宙航空研究開発機構, 宇宙科学研究所, 国際トップヤングフェロー
Project Period (FY)	2012-04-01 – 2014-03-31Completed
Keywords	航空宇宙流体力学 / 数値流体力学 / 圧縮性流体力学 / 乱流 / 流体工学 / 高レイノルズ数流れ / ラージ・エディ・シミュレーション / 不確かさの定量化 / 流体力学 / 剥離流れ / 圧縮性流体 / 不確かさの評価
Research Abstract	A simple yet very effective non-equilibrium wall-model for large-eddy simulation (LES) at arbitrarily high Reynolds numbers was proposed. The proposed ...

Research Products of this project	Journal Article (4 results, of which Peer Reviewed: 1 results) Presentation (22 results, of which Invited: 4 results) Remarks (3 results)