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Reformulating the concept of social distancing using dynamic simulation of new coronavirus droplet transmitting

Research Project

Project/Area Number 21K03856
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionKyoto Institute of Technology

Principal Investigator

Yamakawa Masashi  京都工芸繊維大学, 機械工学系, 教授 (90346114)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Keywords新型コロナウイルス / 飛沫感染 / 計算流体力学 / 感染シミュレーション / マスク / マスク変形 / 非構造格子 / 動的シミュレーション / エスカレーター / 非構造格子有限体積法
Outline of Research at the Start

本研究では,スパコン富岳で実施した数多くの感染シミュレーション研究で獲得したネットワークも活用し2003年に提案した非構造移動格子有限体積法を深化させて,新型コロナ感染に対する『動的』シミュレーション技術を構築し,新たな感染防止策の提案に繋げることを目的としている.具体的には「不織布マスクの動的解析による飛沫飛翔範囲の特定」「満員電車乗降時における乗客の動的計算による車内上部における換気量推定」など3年の研究期間に4つの『動的』テーマに取り組み, その研究結果を用いて定義した新しいSocial distancingによる「3密」の克服など実用的な社会実装を目指す.

Outline of Final Research Achievements

In order to propose and socially implement new lifestyles in the With and After coronas based on scientific evidence that better reflects the actual situation, even taking into account the movements of people and other factors, a ‘dynamic’ simulation technique for viral droplet diffusion in new coronary diseases was developed. In particular, the dynamic simulation for non-woven masks that deform due to coughing predicted that the range of droplet diffusion would be smaller because the velocity of coughing would be suppressed compared to the static simulation in which no deformation occurs. However, the simulation results showed quite the opposite conclusion. This was due to the fact that the inhalation of droplets after diffusion is reduced in the breathing process after coughing with a dynamic mask. Therefore, it was found that dynamic was necessary for more accurate calculations.

Academic Significance and Societal Importance of the Research Achievements

飛沫シミュレーションにおいて、従来の静的モデルに対して動的モデルを導入することで、ウイルス飛沫の挙動をより正確に解析できるようになった。特に、マスクの動的変形が飛沫拡散に与える影響を精緻に評価することが可能となり、呼吸過程における飛沫吸い込みの減少など新たな発見をもたらし、エアロゾル科学の分野における理解を深化させた。またこの研究により得られた知見により、飛沫拡散の実態をより正確に把握することで、効果的なマスクの設計や公共空間での適切な行動指針の策定が可能となる。結果として、感染拡大の防止や公衆衛生の向上に寄与し、社会全体の健康と安全を守るための科学的基盤の提供につながる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (15 results)

All 2024 2023 2022 2021

All Journal Article (14 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 14 results,  Open Access: 6 results) Presentation (1 results)

  • [Journal Article] Impact of neck angle variation on particle and virus-laden droplet transport from lung to lung using eighth-generation airway model2024

    • Author(s)
      Kishi Shohei、Yamakawa Masashi、Takii Ayato、Asao Shinichi、Takeuchi Seiichi、Kim Minsuok
    • Journal Title

      Journal of Computational Science

      Volume: 75 Pages: 102202-102202

    • DOI

      10.1016/j.jocs.2023.102202

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Numerical Simulation of Virus-Laden Droplets Transport from Lung to Lung by Using Eighth-Generation Airway Model2023

    • Author(s)
      Kishi Shohei、Yamakawa Masashi、Takii Ayato、Watamura Tomoaki、Asao Shinichi、Takeuchi Seiichi、Kim Minsuok
    • Journal Title

      Lecture Notes in Computer Science

      Volume: 14077 Pages: 257-270

    • DOI

      10.1007/978-3-031-36030-5_21

    • ISBN
      9783031360299, 9783031360305
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Numerical Simulation of the Octorotor Flying Car in Sudden Rotor Stop2023

    • Author(s)
      Takahashi Naoya、Gomi Ritsuka、Takii Ayato、Yamakawa Masashi、Asao Shinichi、Takeuchi Seiichi
    • Journal Title

      Lecture Notes in Computer Science

      Volume: 14074 Pages: 33-46

    • DOI

      10.1007/978-3-031-36021-3_3

    • ISBN
      9783031360206, 9783031360213
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Turning Flight Simulation with Fluid-Rigid Body Interaction for Flying Car with Contra-Rotating Propellers2023

    • Author(s)
      Takii Ayato、Gomi Ritsuka、Yamakawa Masashi、Tsubokura Makoto
    • Journal Title

      Lecture Notes in Computer Science

      Volume: 14073 Pages: 566-577

    • DOI

      10.1007/978-3-031-35995-8_40

    • ISBN
      9783031359941, 9783031359958
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Flight simulation from takeoff to yawing of eVTOL airplane with coaxial propellers by fluid-rigid body interaction2023

    • Author(s)
      Ritsuka Gomi, Ayato Takii, Masashi Yamakawa, Shinichi Asao, Seiichi Takeuchi and Momoha Nishimura
    • Journal Title

      Advances in Aerodynamics

      Volume: 5 Issue: 1 Pages: 1-15

    • DOI

      10.1186/s42774-022-00133-x

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Simulation of Nearly Missing Helicopters Through the Computational Fluid Dynamics Approach2022

    • Author(s)
      Momoha Nishimura and Masashi Yamakawa
    • Journal Title

      Lecture Notes in Computer Science

      Volume: vol. 13353 Pages: 329-342

    • DOI

      10.1007/978-3-031-08760-8_28

    • ISBN
      9783031087592, 9783031087608
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Blood Flow Simulation of Left Ventricle with Twisted Motion2022

    • Author(s)
      Masashi Yamakawa, Yuto Yoshimi, Shinichi Asao, Seiichi Takeuchi
    • Journal Title

      Lecture Notes in Computer Science

      Volume: vol. 13353 Pages: 343-355

    • DOI

      10.1007/978-3-031-08760-8_29

    • ISBN
      9783031087592, 9783031087608
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Numerical Simulation of an Infinite Array of Airfoils with a Finite Span2022

    • Author(s)
      Takahiro Ikeda, Masashi Yamakawa, Shinichi Asao and Seiichi Takeuchi
    • Journal Title

      Lecture Notes in Computer Science

      Volume: vol. 13353 Pages: 323-328

    • DOI

      10.1007/978-3-031-08760-8_27

    • ISBN
      9783031087592, 9783031087608
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Simulation of Virus-Laden Droplets Transmitted from Lung to Lung2022

    • Author(s)
      Shohei Kishi, Yuta Ida, Masashi Yamakawa, Momoha Nishimura
    • Journal Title

      Lecture Notes in Computer Science

      Volume: vol. 13353 Pages: 356-369

    • DOI

      10.1007/978-3-031-08760-8_30

    • ISBN
      9783031087592, 9783031087608
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Numerical model for cough-generated droplet dispersion on moving escalator with multiple passengers2022

    • Author(s)
      Ayato Takii, Masashi Yamakawa, Atsuhide Kitagawa, Tomoaki Watamura, Yongmann M. Chung, Minsuok Kim
    • Journal Title

      Indoor Air

      Volume: Vol.32, 11, e13131 Issue: 11

    • DOI

      10.1111/ina.13131

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Moving computational multi-domain method for modelling the flow interaction of multiple moving objects2022

    • Author(s)
      Nishimura Momoha, Yamakawa Masashi, Asao Shinichi, Takeuchi Seiichi, Ghomizad Mehdi Badri
    • Journal Title

      Advances in Aerodynamics

      Volume: 4, Article number: 5 Issue: 1 Pages: 1-18

    • DOI

      10.1186/s42774-021-00099-2

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Numerical Simulation of Free Surface Affected by A Submarine Moving Underwater with A Rotating Screw2021

    • Author(s)
      Masashi Yamakawa, Kohei Yoshioka, Shinichi Asao, Seiichi Takeuchi, Atsuhide Kitagawa, and Kyohei Tajiri
    • Journal Title

      Lecture Notes in Computer Science

      Volume: LNCS 12747 Pages: 268-281

    • DOI

      10.1007/978-3-030-77980-1_21

    • ISBN
      9783030779795, 9783030779801
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Flight Simulation of Water Rocket, Shinichi2021

    • Author(s)
      Asao, Masashi Yamakawa, Kento Sawanoi, Seiichi Takeuchi
    • Journal Title

      International Journal of Computational Methods

      Volume: 2141017 Issue: 07

    • DOI

      10.1142/s0219876221410176

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of turbulence-radiation interaction on radiative heat transfer to furnace wall and temperature distribution in large-scale industrial furnaces enveloping hydrocarbon flame2021

    • Author(s)
      Seiichi TAKEUCHI, Shinichi ASAO, Masashi YAMAKAWA
    • Journal Title

      Journal of Thermal Science and Technology

      Volume: 16 Issue: 2 Pages: JTST0030-JTST0030

    • DOI

      10.1299/jtst.2021jtst0030

    • NAID

      130008062570

    • ISSN
      1880-5566
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] マスクの変位を考慮した咳の飛沫シミュレーション2023

    • Author(s)
      三好 達也
    • Organizer
      第37回数値流体力学シンポジウム
    • Related Report
      2023 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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