Influences of distributed surface roughness of small roughness-Reynolds-number on boundary-layer instability and transition

• Project/Area Number: 24560974
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: ASAI Masahito 首都大学東京, システムデザイン研究科, 教授 (00117988)
• Co-Investigator(Kenkyū-buntansha): INASAWA Ayumu 首都大学東京, システムデザイン研究科, 准教授 (70404936)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 流れの安定性 / 壁面粗さ / 境界層 / 乱流遷移 / 流れの不安定性 / T-S波動 / 壁面粗度 / 平面ポアズイユ流

Outline of Final Research Achievements

Influences of distributed surface roughness on boundary-layer instability and transition were examined experimentally by using simple corrugation models of sinusoidal geometry with various corrugation amplitudes and wavelengths. In contrast to strong destabilizing effect of 2-D corrugation, 3-D corrugation had only a small influence on the boundary-layer instability. The distinct difference in the influence of 2-D and 3-D corrugations on the boundary-layer instability was further clarified for oblique surface corrugations. Influences of surface imperfection of small step-size were also demonstrated through numerical simulations and experiments.

Research Products

• [Journal Article] Influences of oblique surface corrugation on boundary-layer instability (2014)
  • Author(s): Mochamad Dady Ma’mun, Masahito Asai
  • Journal Title: Journal of the Physical Society of Japan Volume: 83 Issue: 8 Pages: 084402-084402
  • DOI: 10.7566/jpsj.83.084402
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Effects of surface corrugation on the stability of zero-pressure-gradient boundary layer (2014)
  • Author(s): Mochamad Dady Ma’mun, Masahito Asai, Ayumu Inasawa
  • Journal Title: Journal of Fluid Mechanics Volume: 741 Pages: 228-251
  • DOI: 10.1017/jfm.2013.653
  • Peer Reviewed
• [Presentation] 境界層の安定性に及ぼす分布表面粗さの影響について (2014)
  • Author(s): 淺井雅人，モハマド・ダディ・マムーン
  • Organizer: 第55回乱流遷移の解明と制御研究会
  • Place of Presentation: 東京
  • Year and Date: 2014-09-26 – 2014-09-27
• [Presentation] Effects of oblique angle of surface corrugation on the boundary-layer instability (2014)
  • Author(s): Mochamad Dady Ma'mun, Masahito Asai
  • Organizer: 日本流体力学会年会2014
  • Place of Presentation: 仙台
  • Year and Date: 2014-09-15 – 2014-09-17
• [Presentation] An experimental investigation of the secondary instability in a boundary layer on the three-dimensional surface corrugation (2013)
  • Author(s): Mochamad Dady Ma’mun, Masahito Asai and Ayumu Inasawa
  • Organizer: 14th Asian Conference of Fluid Mechanics
  • Place of Presentation: ハノイ，ベトナム
• [Presentation] 乱流遷移に対するラフネスの影響について (2013)
  • Author(s): 淺井雅人
  • Organizer: 第53回「乱流遷移の解明と制御」研究会
  • Place of Presentation: 東京
• [Presentation] Effects of surface corrugation on boundary layer instability (2012)
  • Author(s): Mochamad Dady Mamun, Masahito Asai, Ayumu Inasawa, Masahiro Shigeta
  • Organizer: １3th International Congress of Theoretical and Applied Mechanics
  • Place of Presentation: 北京，中国
• [Presentation] Influences of small amplitude 3D corrugation on boundary layer instability (2012)
  • Author(s): Mochamad Dady Mamun, Masahito Asai， Ayumu Inasawa
  • Organizer: 日本流体力学会年会2012
  • Place of Presentation: 高知
• [Presentation] 壁面形状の変化に対する不安定波動の応答 (2012)
  • Author(s): 稲澤歩，淺井雅人
  • Organizer: 日本流体力学会年会2012
  • Place of Presentation: 高知