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Yoshiaki Tamura

    Department of Information Sciences and Arts　Professor
    Center for Computational Mechanics Research　Researcher
    Course of Information Sciences and Arts　Professor
Last Updated :2024/04/06

Researcher Information

Degree

  • Doctor of Engineering（The University of Tokyo）
  • Master of Engineering（The University of Tokyo）

Research funding number

  • 40217203

J-Global ID

Research Interests

  • 流体力学   可視化   数値流体力学   Fluid Dynamics   Visualization   Computational Fluid Dynamics   

Research Areas

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Fluid engineering

Academic & Professional Experience

  • 2008/04 - Today  Toyo University, Professor
  • 2008/04 - Today  Toyo University
  • 2001/04 - 2008/03  Toyo University, Associate Professor
  • 2001/04 - 2008/03  Toyo University
  • 1996 - 2001  The University of Tokyo
  • 1996 - 2001  University of Tokyo, Associate Professor
  • 1989 - 1996  Sojo UniversityFaculty of Engineering, Department of Aerospace Systems Engineering
  • 1989 - 1996  Institute of Space and Astronautical Science,
  • Research Associate

Association Memberships

  • American Society for Mechanical Engineers   アメリカ機械学会   The American Institute of Aeronautics and Astronautics   THE VISUALIZATION SOCIETY OF JAPAN   THE JAPAN SOCIETY OF FLUID MECHANICS   THE JAPAN SOCIETY OF MECHANICAL ENGINEERS   アメリカ航空宇宙学会   THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES   

Published Papers

Books etc

  • 計算力学ハンドブック ― II．差分法・有限体積法 熱流体編―
    田村善昭; 藤井孝藏; 松本洋一郎 (Joint editor)丸善 2006/03
  • 広瀬 通孝; 田村 善昭; 小木 哲朗 (Joint work)東京大学出版会 2002/10 413063805X 259
  • 可視化情報学会; 藤井 孝蔵; 田村 善昭; 沖 真; 高木 通俊 朝倉書店 1996 9784254209853

Conference Activities & Talks

  • Automatic Visualization of Various Flow Fields Using Self-Organizing Map  [Not invited]
    Yoshiaki Tamura; Masato Masuda
    WCCM-XV APCOM-VIII  2022/08  Oral presentation
  • Visualization Methods in Virtual Reality Environment  [Not invited]
    TAMURA Yoshiaki
    6th European Conference on Computational Mechanics (ECCM 6) and 7th European Conference on Computational Fluid Dynamics (ECFD 7)  2018/06  Oral presentation
  • 深層学習を用いた数値解析結果の予測  [Not invited]
    増田正人; 中林靖; 田村善昭
    日本機械学 会第 30 回計算力学講演会  2017/09  Oral presentation
  • Numerical Simulation Method of Gas-Liquid Two-Phase Flow for a Cavitation Bubble Collapse  [Not invited]
    TAMURA Yoshiaki
    The 12th World Congress on Computation Mechanics and The 6th Asia-Pacific Congress on Computational Mechanics  2016/07  Oral presentation
  • Development of Numerical Simulation Method for Compressible Gas-Liquid Two-Phase Flows  [Not invited]
    TAMURA Yoshiaki
    The 9th International Symposium on Cavitation  2015/12
  • 自己組織化マップを用いたラットの血中アミノ酸量と肝臓脂肪の関係分類  [Not invited]
    増田正人; 塩谷隆二; 中林靖; 伯野史彦; 西宏起; 高橋伸一郎; 田村善昭
    第28回計算力学講演会  2015/10
  • ベイズ推定を用いた実験と数値シミュレーション融合による高精度予測  [Not invited]
    島村雅彦; 江澤良孝; 田村善昭; 高清水聖; 佐藤大亮
    第28回計算力学講演会  2015/10
  • Development of Numerical Methods for Compressible Gas-Liquid Two Phase Flows  [Not invited]
    TAMURA Yoshiaki
    The 13h Asian International Conference on Fluid Machinery 2015  2015/08
  • Numerical Simulation Method of Compressible Gas-Liquid Two Phase Flow  [Not invited]
    TAMURA Yoshiaki
    PANACM 2015  2015/04
  • NAGAOKA Shinsuke; NAKABAYASHI Yasushi; TAMURA Yoshiaki; YAGAWA Genki
    The Computational Mechanics Conference  2014/11  Oral presentation 
    Fluid-structure interaction problem is becoming a very important issue in numerical analysis field. A lot of methods to solve this phenomenon are proposed by many researchers. Our proposed new method to solve fluid-structure interaction problem is combined the Enriched Free Mesh Method and the SUPG/PSPG stabilized Finite Element Method. This method is using only linear element but it can be obtained fine analysis result. On the other hand, no crucial benchmark test for fluid structure interaction problems is also available. Therefore, we also proposed new experiment for fluid structure interaction problem to establish a new benchmark test. In this paper, we described comparison between experimental result and analysis result to prove effectiveness of our proposed method.
  • Masuda Masato; Nakabayashi Yasushi; Tamura Yoshiaki
    The Computational Mechanics Conference  2014/11  Oral presentation
  • 圧縮性気液二相流の数値解析手法の開発  [Not invited]
    田村善昭; 松尾友紀
    キャビテーションに関するシンポジウム（第17回）  2014/11  Oral presentation
  • The Comparison of the Experimental Result with the Numerical Analysis using the New Coupled Analysis Method based on the Enriched Free Mesh Method and the SUPG/PSPG Stabilized Finite Element Method  [Not invited]
    Shinsuke Nagaoka; Yasushi Nakabashi; Yoshiaki Tamura; Genki Yagawa
    11th World Congress on Computational Mechanics (WCCM XI), 5th European Conference on Computational Mechanics (ECCM V) and 6th European Conference on Computational Fluid Dynamics (ECFD VI)  2014/07  Oral presentation
  • Fluid-Structure Interaction Analysis of Vibration Phenomena and Verification of its classification and Prediction Accuracy using Modular Network Self-Organizing Map  [Not invited]
    Masato Masuda; Yasushi Nakabayashi; Yoshiaki Tamura
    11th World Congress on Computational Mechanics (WCCM XI), 5th European Conference on Computational Mechanics (ECCM V) and 6th European Conference on Computational Fluid Dynamics (ECFD VI)  2014/07  Oral presentation
  • Some Modifications of Bubble Model for Cavitating Flow Simulations  [Not invited]
    Yoshiaki Tamura; Nobuo Tsurumi; Yoichiro Matsumoto
    11th World Congress on Computational Mechanics (WCCM XI), 5th European Conference on Computational Mechanics (ECCM V) and 6th European Conference on Computational Fluid Dynamics (ECFD VI)  2014/07  Oral presentation
  • Visualizations of Bubble Motions and Temperature Rises by Focused Ultrasound  [Not invited]
    Yoshiaki Tamura; Nobuo Tsurumi; Yoichiro Matsumoto
    International Conference on Mechanical Engineering 2013 (ICME2013)  2014/06  Keynote oral presentation
  • Fluid-Structure Coupled Analysis of Vibration Phenomena and Its Classification and Prediction Using the modular network Self Organizing Map  [Not invited]
    Masato Masuda; Yasushi Nakabayashi; Yoshiaki Tamura
    5th Asia Pacific Congress on Computational Mechanics (APCOM2013) and 4th International Symposium on Computational Mechanics (ISCM2013)  2013/12  Oral presentation
  • Numerical Simulation of Nonlinear Acoustic Waves in Two-Phase Fluid  [Not invited]
    Yoshiaki Tamura; Nobuo Tsurumi; Yoichiro Matsumoto
    5th Asia Pacific Congress on Computational Mechanics (APCOM2013) and 4th International Symposium on Computational Mechanics (ISCM2013)  2013/12  Oral presentation
  • MASUDA Masato; NAKABAYASHI Yasushi; TAMURA Yoshiaki
    The Computational Mechanics Conference  2013/11
  • 振動現象の連成解析及び自己組織化マップによるその分類  [Not invited]
    増田正人; 中林靖; 田村善昭
    日本機械学会第26回計算力学講演会論文集  2013/11  Oral presentation
  • 気泡の初生を考慮した気泡モデルに基づくキャビテーション流れ解析  [Not invited]
    田村善昭; 鶴見伸夫; 松本洋一郎
    日本機械学会第26回計算力学講演会論文集  2013/11  Oral presentation
  • Numerical Simulation Method of HIFU with Microbubbles  [Not invited]
    Yoshiaki Tamura; Nobuo Tsurumi; Yoichiro Matsumoto
    ASME/FDA 2013 1st Annual Frontiers in Medical Devices: Applications of Computer Modeling and Simulation (FMD2013)  2013/09  Oral presentation
  • 集束超音波による気泡運動と温度上昇の可視化  [Not invited]
    田村善昭; 鶴見伸夫; 松本洋一郎
    第41回可視化情報シンポジウム講演論文集  2013/07  Oral presentation
  • 気泡の合体の効果を考慮したキャビテーション流れのための気泡モデル  [Not invited]
    田村善昭; 鶴見伸夫; 松本洋一郎
    第26回数値流体力学シンポジウム  2012/12  Oral presentation
  • Numerical Simulation of Wave Propagation in Two-Phase Fluid  [Not invited]
    Nobuo Tsurumi; Yoshiaki Tamura; Yoichiro Matsumoto
    European Congress on Computational Methods in Applied Science and Engineering (ECCOMAS 2012)  2012/09  Oral presentation
  • Further Improvement of Bubble Model for Cavitating Flow Simulations  [Not invited]
    Yoshiaki Tamura; Nobuo Tsurumi; Yoichiro Matsumoto
    8th International Symposium on Cavitation (CAV2012)  2012/08  Oral presentation
  • Cavitating Jet Simulation for Predicting Residual Stress Improvement of cylindrical Structure by Water Jet Peening  [Not invited]
    Masashi Fukaya; Ren Morinaka; Noboru Saitou; Hisamitsu Hatou; Yoshiaki Tamura; Yoichiro Matsumoto
    8th International Symposium on Cavitation (CAV2012)  2012/08  Oral presentation
  • 圧縮性気液二相流の数値解析手法の開発  [Not invited]
    松尾友紀; 伊倉宏治; 田村善昭
    日本機械学会関東支部第18期総会講演会  2012/03  Oral presentation
  • ダリウス型風車まわりの流体解析  [Not invited]
    小俣慎弥; 田村善昭
    日本機械学会関東支部第18期総会講演会  2012/03  Oral presentation
  • 気泡を含む流体中を伝播する超音波の数値解析  [Not invited]
    鶴見伸夫; 田村善昭; 松本洋一郎
    第25回数値流体力学シンポジウム  2011/12  Oral presentation
  • Numerical Simulation of Ultrasound Wave Propagation in Water with Bubbles  [Not invited]
    Nobuo Tsurumi; Yoshiaki Tamura; Yoichiro Matsumoto
    International Congress on Ultrasonics 2011 (ICU 2011)  2011/09  Oral presentation
  • Prediction of Residual Stress Improvement by Water Jet Peening (WJP) Using Cavitating Jet and Residual Stress Simulations  [Not invited]
    Masashi Fukaya; Fujio Yoshikubo; Hisamitsu Hatou; Yuji Matsui; Yoshiaki Tamura; Yoichiro Matsumoto
    19th International Conference on Nuclear Engineering, (ICONE19)  2011  Oral presentation
  • 鶴見伸夫; 田村善昭; 松本洋一郎
    キャビテーションに関するシンポジウム（第15回）  2010/11  Oral presentation
  • 深谷征史; 守中廉; 齋藤昇; 波東久光; 田村善昭; 松本洋一郎
    キャビテーションに関するシンポジウム（第15回）  2010/11  Oral presentation
  • FUKAYA Masashi; MORINAKA Ren; SAITOU Noboru; HATOU Hisamitsu; TAMURA Yoshiaki; MATSUMOTO Yoichiro
    M&M材料力学カンファレンス  2010/10 
    We developed a numerical method for predicting a distribution of compressive residual stress on a material surface after water jet peeing (WJP). WJP applies the bubble collapse energy of cavitating jet to the change of residual stress from tensile to compressive for preventing the occurrence of stress corrosion cracking. We estimated the impulsive bubble pressure that varied in microseconds by using a numerical simulation with 'bubble flow model'. The bubble collapse energy was evaluated by the cavitation intensity calculated from the bubble pressure. The cavitation intensity was predicted ...
  • HIRANO Kazuya; TAMURA Yoshiaki
    日本機械学会関東支部総会講演会講演論文集  2010/03 
    Numerical analysis methods of gas-liquid multiphase flow have been studied by many researchers. In analysis of gas-liquid multiphase flow, the analysis methods of compressible flow are different from those of incompressible flow. Study about numerical analysis of multiphase flow with compressibility of liquid phase is few. Thus we will try to calculate multiphase flow with compressibility of liquid phase. In this research, Euler equation and Level-Set method for capturing interface are used.
  • MIYAMOTO Yuki; TAMURA Yoshiaki
    日本機械学会関東支部総会講演会講演論文集  2010/03 
    Recently, large-scale numerical simulation has become possible by improvement of the computer performance and the data of numerical result has become large. Then, some problems arise. When the result data is larger than memory, PC cannot visualize. Generally, large-scale data visualization system transmits all or a part of the result data from server to client PC for visualization. But unstructured grid data is not easy to be thinned out unlike structure grid data because unstructured grid data is not regularly aligned. In this research, we propose a system for large-scale unstructured grid...
  • FUKAYA Masashi; MORINAKA Ren; SAITOU Moboru; HATOU Hisamitsu; TAMURA Yoshiaki; MATSUMOTO Yoichiro
    M&M材料力学カンファレンス  2009/07 
    We developed a new method for predicting a range of compressive residual stress on the material surface after water jet peeing (WJP). Cavitating jet is impinged on the material surface in WJP. The bubble collapse impact causes the plastic deformation of the material surface, and changes the residual stress from tensile to compressive. The compressive residual stress prevents the occurrence of the stress corrosion cracking. We numerically simulated impulsive bubble pressure that varied in microseconds in the cavitating jet with `bubble flow model'. The bubble collapse impact was evaluated by...
  • MIYAMOTO Yuki; TAMURA Yoshiaki
    Journal of the Visualization Society of Japan  2009/07
  • FUJII Hidenori; FURUSAWA Hiroyuki; TAMURA Yoshiaki
    Journal of the Visualization Society of Japan  2009/07
  • TAMURA Yoshiaki; FURUSAWA Hiroyuki; FUJII Hidenori; MIYAMOTO Yuki
    Journal of the Visualization Society of Japan  2009/07
  • Tamura Y; Nakajima Y; Uebayashi J; Matsumoto Y
    埼玉ブロック大会(講演会)講演論文集  2007/09
  • Fukaya Masashi; Tamura Yoshiaki; Matsumoto Yoichiro; Ono Shigeyoshi; Harada Ichiro
    年次大会講演論文集 : JSME annual meeting  2007/09 
    We predicted a cavitation erosion area in an open-type mixed-flow pump that was subject to tip vortex cavitation by using a numerical simulation code based on the `bubble flow model'. The erosion area on the impeller blade was predicted by estimating the cavitation intensity that was defined with the detailed bubble pressure and the bubble nuclei distribution. For comparison, we determined experimentally the erosion area in the same pump using a paint method. The predicted and the actual erosion areas located near the blade tip in the middle of the blade between the leading edge and the tra...
  • TAMURA Yoshiaki
    Fluids engineering conference ...  2006/10
  • YOSHIDA Ryu; TAMURA Yoshiaki
    Fluids engineering conference ...  2006/10 
    In these years, a variety of numerical simulations are performed under the favor of computational performance and the progress of computational methods. Especially in FSI(Fluid-Structure Interaction) Analysis, flow is analysed in consideration of object's transformation by flow force. The objective of this research is FSI inverse analysis. In FSI inverse analysis, stress distribution is calculated from displacement of the object, and flow is calculated from the stress distribution. Here, the two dimensional FSI analysis was done for flow around the elastic square cylinder. The change of flo...
  • HASUMI Kazuaki; TAMURA Yoshiaki
    Fluids engineering conference ...  2006/10
  • NAKAJIMA Yusuke; TAMURA Yoshiaki; MATSUMOTO Yoichiro
    Fluids engineering conference ...  2006/10
  • YOSHIDA Ryu; ISHIKAWA Ryosuke; TAMURA Yoshiaki
    日本機械学会関東支部総会講演会講演論文集  2006/03 
    Cartesian grid is often used in CFD for largc-scale simulations of both two- and three-dimensions. However, the accuracy of Cartesian grid is evaluated less than body-fitted grid because the body boundaries are not smooth in Cartesian grid and quantitative analysis of accuracy in Cartesian grid related to body representation is hardly seen in literature. Thus numerical simulations are performed on Cartesan grid with various number of grid points and flow conditions. The numerical results are compared with those of bodyfitted grid and experiments, and the accuracy of Cartesian grid are evalu...
  • TAMURA Yoshiaki; ONO Chihiro; FURUSAWA Hiroyuki; YOSHIDA Mayumi
    日本機械学会関東支部総会講演会講演論文集  2006/03 
    There are many objects traveling fast, such as bicycle, bike, ski, skate and so on. It is necessary to obtain object figures including human body, which is flexible and very individual, for numerical analysis of flow around the objects. Generally speaking, we don't have CAD data for human body. Here digital images are utilized to obtain human body figure and incorporated into the numerical analysis. In this paper, the numerical method based on digital images are presented and discussed
  • FUJII Kozo; OGASA Atsuji; NAKAJIMA Takuji; TAMURA Yoshiaki; MORIYA Mitsuhiro
    年次大会講演論文集 : JSME annual meeting  2005/09 
    Vistrace is one kind of software that the present authors have recently developed as an interface software program connecting simulations on the server and visualizations on the client machine. The present paper describes good features and future possibility of the software VisTrace.
  • TAMURA Yoshiaki; OGASA Atsuji; NAKAJIMA Takuji; FUJII Kozo
    Journal of the Visualization Society of Japan  2005/03
  • Fukaya Masashi; Tamura Yoshiaki; Matsumoto Yoichiro; Okamura Tomoyoshi; Manabe Akira
    年次大会講演論文集 : JSME annual meeting  2004/09 
    The prediction of cavitation erosion by using numerical flow simulation is necessary for designing small high-speed pumps. This erosion is closely related to the bubble dynamics near the solid surfaces such as impeller blades and casing walls. We developed a new numerical simulation code for investigating bubble behavior in a centrifugal pump. We simulated distributions of the bubble number density, the bubble size and the bubble pressure, which were close to the impeller blade. The numerical results were consistent and revealed a potential of this code to predict flow and bubble behavior u...
  • TAMURA Yoshiaki; SHOJI Daisuke
    可視化情報学会誌. Suppl.  2004/07
  • FUJIMATSU Nobuyoshi; TAMURA Yoshiaki; FUJII Kozo
    Journal of the Visualization Society of Japan  2003/07
  • TAMURA Yoshiaki
    可視化情報学会誌 = Journal of the Visualization Society of Japan  2002/07
  • Tamura Yoshiaki; Sugiyama Kazuyasu; Tsuchiya Naoki; Matsumoto Yoichiro
    Fluids engineering conference ...  2000/09
  • YANO Hiroaki; TAMURA Yoshiaki; OGI Tetsuro; HIROSE Michitaka
    年会一般講演  1998/07
  • TAMURA Yoshiaki; TSUCHIYA Shigemasa; HAYASHI A. koichi
    年会一般講演  1998/07
  • FUJII Kozo; OGAWA Takanobu; TAMURA Yoshiaki
    計算工学講演会論文集  1997/05
  • Tamura Yoshiaki; Fujii Kozo; Kuroda Shin-ichi
    Special publication of National Aerospace Laboratory : SP  1996
  • Ogawa Takanobu; Fujii Kozo; Tamura Yoshiaki
    Special publication of National Aerospace Laboratory : SP  1992

Works

  • キャビテーション流れの数値解析
    1998 -2001
  • Numerical Analysis of Cavitating Flow
    1998 -2001
  • バーチャルリアリティ技術の計算力学への応用に関する研究
    1998 -2000
  • Research on Virtual Reality Technology Applied to Computational Mechanics
    1998 -2000

MISC

Awards & Honors

  • 2019/12 Japan Association for Computational Mechanics JACM Fellows Award
     
    受賞者: Yoshiaki Tamura
  • 2018/09 Japan Society for Simulation Technology Best Author Award
     Visual V & V of Large-Scale Fluid-Structure Interaction Problem 
    受賞者: TAMURA Yoshiaki
  • 2011 日本機械学会 日本機械学会賞（論文）
     
    受賞者: 田村 善昭
  • 2004 財団法人大川情報通信基金大川出版賞
     JPN
  • 2004 ターボ機械協会論文賞
     JPN
  • 2000 第６回Computer Visualization Contest入選
     JPN
  • 1994 科学技術映像祭学術部門科学技術庁長官賞
     JPN

Research Grants & Projects

  • 光学ガラス部品及び金属加工部品に関する外観検査サービス提供基盤の開発
    埼玉県：AIを活用した機器等開発・実証補助金
    Date (from‐to) : 2019/06 -2020/03 
    Author : 田村善昭; 中林靖; 村上真
  • 大規模高精度流体̶構造連成解析手法の開発と詳細実験による精度・妥当性検証
    文部科学省：私立大学戦略的研究基盤形成支援事業
    Date (from‐to) : 2012/04 -2017/03 
    Author : 田村 善昭
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2002 -2004 
    Author : KATO Hiroharu; USAMI Ron; TAMURA Yoshiaki; YAMAGUCHI Hajime; TOKUMITSU Kazuto
     
    The high concentration of energy at the final stage of a cavitation bubble collapse causes very high pressure of more than 1 GPa. This sometime causes a detrimental effect to hydraulic machinery. However, we can use the high pressure for environmental protection. In this research project we performed the following 4 research subjects. 1.Killing Plankton An abnormal increase in the amount of plankton in lakes and ponds can destroy their ecological environment. Another important subject is the discharge of ballast water from ocean-going ships. The ballast water contains plankton and fish eggs. They may destroy the ecological environment, when discharged thousands miles away from where they live. It was found that the cavitating jet with a target body was effective to killing plankton. 2.Dispersing Spilled Oil Oil spill accidents have a disastrous effect on the ocean environment. Mechanical recovery of oil is the most desirable method. But, it can become difficult for various reasons, such as bad weather. The oil dipersion is the second-best solution, and dispersants are used. However, the dispersant may cause side effects. The dispersion of oil by cavitating jet is a unique and effective method, which was newly developed in the present project. 3.Sterilization of Bacteria Sterilization of bacteria has been one of the most important procedures in human life. Heating is the most popular and common method of sterilization. However, it needs considerable amount of energy, and sometimes the nature of the material to be sterilized becomes worse. Chemicals are other popular sterilization method, but the chemicals may cause side effects to human body. The cavitaing flow is effective for the sterilization of bacteria. We tested two different types of bacteria, the Bacillus Subtilis as a typical example of the Gram-positive bacteria, and the Escherichia Coli as a typical example of the Gram-negative bacteria. 4.Oxidation of Organic Compounds The cavitating jet is also effective for oxidation of harmful organic compounds. We performed systematic experiments for four organic compounds, 1,4-dichlorobenzene, biphenyl, dibenzofuran, and dibenzo-p-dioxin. It was found that the decomposition rate increased almost linearly with increasing injection pressure and with decreasing cavitation number.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1999 -2000 
    Author : MATSUMOTO Yoichiro; YAMAGUCHI Hajime; KATO Hiroharu; TAMURA Yoshiaki; SUGIYAMA Kazuyasu; ICHIKAWA Yasumasa
     
    It is well known that a cloud cavitation is one of the most destructive forms of cavitation. In the present study, the set of equations for the motion of a spherical bubble cloud is formulated and the behavior of bubble clouds are simulated numerically under the situation of sudden change of surrounding pressure. To study the collapse of cloud cavitation more accurately, the internal phenomena of each bubble and the compressibility of liquid are considered in the governing equations. An inward propagating shock wave is formed during the collapse of bubble cloud and the shock wave is focused in the center region of the cloud. This makes a violent bubble collapse, which cause a high emitted pressure from the bubbles, which is several hundreds times larger than the single bubble collapse. Furthermore, a new numerical method for simulating cavitating flows around hydrofoil is developed. Cloud cavitation is modeled with perfectly spherical bubbles whose radii change with Rayleigh-Plesset equation. The bubbles are also allowed to have slip velocities so that the bubble accumulation could be simulated. Psedocompressibility concept for incompressible flow simulation is extended for the present systems of equations for efficient and robust computations. Computations of two-and three-dimensional cavitating flows verify the present method and show its capability to the practical applications.
  • 文部科学省：科学研究費補助金(奨励研究(A))
    Date (from‐to) : 1993 -1993 
    Author : 田村 善昭
     
    まず,本年度前期は予定に従い,会話的数値計算(Interactive Computing)のためのグラフイックス・ライブラリの開発とこれを用いた簡単な計算を行った.グラフイックス・ライブラリは数値計算に負荷がかからないように,また,数値計算のプログラムを大幅に書き換える必要のないように別プロセスとして動作するようにした.数値計算側からのグラフイックスの呼び出しはプロッタ・ルーチン的なものとし,ウィンド-操作や絵の拡大・縮小などはグラフイックスのプロセスが会話的に行い,数値計算部分には影響しないようになっている.従って,数値計算部分の書き直しは計算の各時刻で物体形状や等高線などを描くサブルーチンを呼び出すようにするだけである.簡単な例題としては2次元の衝撃波の反射を計算した.圧力や密度の等高線の変化を眺めることで解が発達していく様子がよく分かる.後期はメモリーの増強により,より実際的な計算ができるようになったので,2次元の実際的な翼型まわりの遷音速粘性流を計算してその効果を確かめたほか,トンネルに突入する物体によって誘起される流れ場を模擬した1次元計算や空力音響のための新しい高解像度計算手法の開発などに応用した.トンネルの計算では,非定常な流れの様子がよく分かるほか,パラメータの違いによる流れの変化も容易に比較することができた.空力音響の問題は空力騒音を解決するための手段として...

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