Development of a 3D numerical wind wave tank using an explicit method of water surface location

• Project/Area Number: 20560482
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: Osaka Sangyo University
• Principal Investigator: MIZUTANI Natsuki Osaka Sangyo University, 工学部, 教授 (50356036)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
• Keywords: 風波 / 気流の剥離 / 運動量輸送 / 数値風洞水槽 / 可視化実験 / 自己調整機能 / 風波レイノルズ数 / 界面抵抗係数 / 海洋物理 / 数値解析手法 / 可視化 / 値解析手法

Research Abstract

Development of a 3D numerical wind wave tank was tried to compute air flow, water flow and wind waves. From previous results, it has been found that there is large gradient of velocity at water surface. In this study, two explicit methods to treat water surface were proposed, but the numerical model using the methods didn't have enough accuracy. From visualization experiments carried out to be compared with numerical results, it was found that air flow separation over wind waves controlled momentum transfer between air side and water side. This result suggests that air flow separation strongly affects self control of development mechanism of wind waves.

Research Products

• [Journal Article] 水面の抵抗係数に及ぼす風波界面上の気流の影響 (2011)
  • Author(s): 水谷夏樹
  • Journal Title: ながれ 第30巻,No.3(印刷中)
  • NAID: 110008686888
  • Peer Reviewed
• [Journal Article] 砕波を伴わない風波の自己調整機能に対する気流の剥離の役割について (2011)
  • Author(s): 水谷夏樹,鍛治允啓,宮島昌弘
  • Journal Title: 土木学会論文集B2(海岸工学) Vol.67(印刷中)
  • NAID: 130004550539
  • Peer Reviewed
• [Journal Article] 水面の抵抗係数に及ぼす風波界面上の気流の影響 (2011)
  • Author(s): 水谷夏樹
  • Journal Title: ながれ Volume: 30巻, No.3(印刷中)
  • NAID: 110008686888
  • Peer Reviewed
• [Journal Article] 風波上の気流の剥離の発生頻度とその要因について (2009)
  • Author(s): 水谷夏樹,Edwin A.Cowen,宮島昌弘
  • Journal Title: 土木学会論文集B2(海岸工学) Vol.65,No.1 Pages: 76-80
  • NAID: 130004956193
  • Peer Reviewed
• [Journal Article] 風波上の気流の剥離の発生頻度とその要因について (2009)
  • Author(s): 水谷夏樹, Edwin A.Cowen, 宮島昌弘
  • Journal Title: 土木学会論文集B2(海岸工学) 56 Pages: 76-80
  • NAID: 130004956193
  • Peer Reviewed
• [Presentation] The relationship between occurrence frequency of air flow separation over wind waves and statistic values of wind waves (2010)
  • Author(s): Mizutani N., E.A.Cowen
  • Organizer: The 6th International Symposium on Gas Transfer at Water Surface
  • Place of Presentation: Kyoto, JAPAN
  • Year and Date: 2010-05-19
• [Presentation] The Relationship between Occurrence Frequency of Air Flow Separation over Wind Waves and Statistic Values of Wind Waves (2010)
  • Author(s): Mizutani, N., E.Cowen
  • Organizer: The 6th International Symposium on Gas Transfer at Water Surface
  • Place of Presentation: Kyoto, JAPAN
  • Year and Date: 2010-05-19