Volume pixel modeling of nasal air conditioning function based on medical images

• Project/Area Number: 18K03970
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Chiba University
• Principal Investigator: Tanaka Gaku 千葉大学, 大学院工学研究院, 教授 (20292667)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 熱工学 / 生体熱工学 / 熱・物質移動 / 生物・生体工学 / 流体工学 / 生体モデリング / 鼻腔 / エアコンディショニング

Outline of Final Research Achievements

This work describes a new approach to simulate the airflow and air-conditioning in the human nasal cavity using voxel-based modeling. Voxel-based simulation of steady and unsteady flow was performed to resolve the flow and temperature fields. The results were verified by comparison with the experiments. It was found that this method enables high-speed and stable grid generation for complicated shapes of the nasal cavity and is useful for analysis of transitional flow and various functions in the nasal cavity.

Academic Significance and Societal Importance of the Research Achievements

本手法の優れた並列化効率を活かして，格子を渦の最小スケールまで細分化した直接数値計算（DNS）を実施し，鼻腔内に生じる流れの不安定性を調査した．その結果，鼻腔狭窄部下流に発生するジェットと再循環流の間に形成されるせん断層においてケルビンヘルムホルツ不安定流れが形成されることを確認した．また，乱れのパワースペクトルは比較的低いレイノルズ数においても乱流に近い特徴を示すことを明らかにした．

Research Products

• [Int'l Joint Research] Imperial College London(英国)
• [Int'l Joint Research] Imperial College London(英国)
• [Int'l Joint Research] Imperial College London(英国)
• [Journal Article] Voxel-based simulation of flow and temperature in the human nasal cavity (2020)
  • Author(s): Kimura Shinya、Miura Shuta、Sera Toshihiro、Yokota Hideo、Ono Kenji、Doorly Denis J.、Schroter Robert C.、Tanaka Gaku
  • Journal Title: Computer Methods in Biomechanics and Biomedical Engineering Volume: - Issue: 4 Pages: 1-8
  • DOI: 10.1080/10255842.2020.1836166
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Voxel-based modeling of airflow in the human nasal cavity (2019)
  • Author(s): Kimura Shinya、Sakamoto Takashi、Sera Toshihiro、Yokota Hideo、Ono Kenji、Doorly Denis J.、Schroter Robert C.、Tanaka Gaku
  • Journal Title: Computer Methods in Biomechanics and Biomedical Engineering Volume: － Issue: 3 Pages: 1-9
  • DOI: 10.1080/10255842.2018.1555584
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Voxel-based Simulation of Nasal Airflow during a Sniff (2018)
  • Author(s): 木村 真也、木村 祐介、世良 俊博、小野 謙二、田中 学
  • Journal Title: Transactions of Japanese Society for Medical and Biological Engineering Volume: 56 Issue: 2 Pages: 37-43
  • DOI: 10.11239/jsmbe.56.37
  • NAID: 40021703447
  • ISSN: 1347-443X, 1881-4379
  • Year and Date: 2018-04-10
  • Peer Reviewed
• [Presentation] 嗅動作時における鼻腔内遷移流れの直接数値シミュレーション (2020)
  • Author(s): 吉岡慧一郎，三浦秀太， 木村真也，世良俊博， 小野謙二，田中学
  • Organizer: 日本機械学会第31回バイオフロンティア講演会
• [Presentation] 嗅動作時における鼻腔内遷移流れの直接数値シミュレーション (2019)
  • Author(s): 三浦秀太, 吉岡慧一郎, 木村真 也, 世良俊博, 小野謙二, 田中 学
  • Organizer: 日本機械学会第32回バイオエンジニアリング講演会
• [Presentation] Comparative study of grid generation methods for the simulation of nasal airflow during a sniff (2018)
  • Author(s): Shinya Kimura, Takashi Sakamoto, Toshihiro Sera, Kenji Ono, Gaku Tanaka, Denis J. Doorly, Robert C. Schroter
  • Organizer: 8th World Congress of Biomechanics
  • Int'l Joint Research
• [Presentation] 木村 真也，三浦 秀太，世良 俊博， 横田 秀夫，小野謙二，田中 学 (2018)
  • Author(s): 鼻腔内エアコンディショニングのボクセルシミュレーション
  • Organizer: 2018年度日本冷凍空調学会年次大会
• [Presentation] 三浦秀太，木村真也，世良俊博，小野謙二，田中 学 (2018)
  • Author(s): 嗅動作時鼻腔内気流シミュレーションにおける計算格子法の比較研究
  • Organizer: 日本機械学会第29回バイオフロンティア講演会
• [Presentation] 清水崇文 ，平井康幸 ，木村真也，世良俊博，横田秀夫，小野謙二，田中 学 (2018)
  • Author(s): 嗅動作時における鼻腔内流れのボクセルシミュレーション
  • Organizer: 日本機械学会第31回バイオエンジニアリング講演会