Verification Study toward the Strategic Drag Reduction Control of Practical Bluff Boies

2013 Fiscal Year Final Research Report

• Project/Area Number: 23560179
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Hokkaido University
• Principal Investigator: TSUBOKURA Makoto 北海道大学, 工学(系)研究科(研究院), 准教授 (40313366)
• Project Period (FY): 2011 – 2013
• Keywords: 乱流 / 空力 / 抵抗低減 / ラージエディシミュレーション

Research Abstract

The six research topics we have involved in this project are as follows: (1)Vortex structures and the mechanisms of the aerodynamic drag acting on simplified vehicle models, (2) Mathematical models for the dynamic flow control, (3) Instability of trailing edge vortices, (4) Proposal of the drag reduction control, (5) Effect of the drag reduction control on the on-road conditions, (6) Strategic technology for the drag reduction of real vehicles. First, by imposing dynamic pitching, yawing and lane-change motions on simplified vehicle models, we have revealed how these transient aerodynamic forces are caused by unsteady flow structures around the vehicle models. Applying this knowledge acquired by the simplified models to real sedan-type vehicle shapes, we have clarified the mechanisms of how drag and lift forces changes through the boundary layer and vortex structures on and around the vehicles, then examined possibility of reducing the drag by controlling eddy structures.

Research Products

• [Journal Article] Vehicle Aerodynamics Simulation for the Next Generation on the K-computer : Part 1 Development of the framework for fully unstructured grids up to 10 billion numerical elements (2014)
  • Author(s): Makoto Tsubokura, Andrew Hamilton Kerr, Keiji Onishi, Yoshimitsu Hashizume
  • Journal Title: SAE International Journal of Passenger Cars–Mechanical Systems Volume: 7(2) Pages: 2014-01-0621
  • Peer Reviewed
• [Journal Article] 自動車の高速操舵走行時の安定性に寄与する車体周りの非定常流れ特性 (2014)
  • Author(s): 岡田義浩,農沢隆秀,坪倉誠,中島卓司
  • Journal Title: 日本機械学会論文集 Volume: 第80巻, 809号(transjsme.2014fe0009) Pages: 1-17
  • Peer Reviewed
• [Journal Article] Coupled analysis of unsteady aerodynamics and vehicle motion of a road vehicle in windy conditions (2013)
  • Author(s): Takuji Nakashima, Makoto Tsubokura, Mariano Vázquez, Herbert Owen, Yasuaki Doi
  • Journal Title: Journal of Computers & Fluids Volume: vol.80(10) Pages: 1-9
  • Peer Reviewed
• [Journal Article] Aerodynamic Stability of Road Vehicles in Dynamic Pitching Motion (2013)
  • Author(s): Seeyuan Cheng, Makoto Tsubokura, Yoshihiro Okada, Takahide Nouzawa, Takuji Nakashima, and Deog Hee Doh
  • Journal Title: Journal of Wind Engineering and Industrial Aerodynamics Volume: vol.122 Pages: 146-156
  • Peer Reviewed
• [Journal Article] 自動車横風突風遭遇時の非定常空力応答と車体形状の影響について (2013)
  • Author(s): 池田隼,坪倉誠,長谷川巧,小森谷徹,中島卓司
  • Journal Title: 日本機械学会論文集(B編) Volume: 第79巻, 806号 Pages: 2077-2092
  • Peer Reviewed
• [Journal Article] 車両運動時に発生する非定常空気力と流れ場に関する研究 (2013)
  • Author(s): 中江雄亮,池田準,安木剛,田中博,山下太郎,坪倉誠,中島卓司
  • Journal Title: 自動車技術会論文集 Volume: vol.44, No.6(2013年春季大会で講演) Pages: 1471-1476
  • Peer Reviewed
• [Journal Article] 自動車のホイール回転が車両空力に及ぼす影響に関するLES解析 (2013)
  • Author(s): 池田隼,坪倉誠,小林竜也,長谷川巧,小森谷徹
  • Journal Title: ながれ(日本流体力学会誌) Volume: vol.32, No.2 Pages: 107-111
  • Peer Reviewed
• [Journal Article] Numerical Quantification of Aerodynamic Damping on Pitching of Vehicle-Inspired Bluff Body (2012)
  • Author(s): Seeyuan Cheng, Makoto Tsubokura, Takuji Nakashima, Takahide Nouzawa, Yoshihiro Okada
  • Journal Title: Journal of Fluids and Structures Volume: vol.30 Pages: 188-204
  • Peer Reviewed
• [Journal Article] Unsteady vehicle aerodynamics during a dynamic steering action : 2nd report, Numerical analysis (2012)
  • Author(s): Tsubokura, M., Ikawa, Y., Okada, Y., Nakashima, T., Nouzawa, T.
  • Journal Title: SAE International Journal of Passenger Cars–Mechanical Systems Volume: 5(1) Pages: 395-411
  • Peer Reviewed
• [Presentation] 自動車レーンチェンジ運動中の空力安定性に関するLES解析 (2013)
  • Author(s): 池田隼,坪倉誠,中江雄亮,中島卓司,山中淳,田中博,安木剛
  • Organizer: 第27回数値流体力学シンポジウム
  • Place of Presentation: 名古屋大学東山キャンパス(名古屋市)
  • Year and Date: 20131217-19
• [Presentation] サーキット走行を模擬したフォーミュラカーの空力シミュレーション (2013)
  • Author(s): 奈良康平,坪倉誠,池田隼,竹本豊和,大西慶治,中島卓司,佐々木良浩
  • Organizer: 第27回数値流体力学シンポジウム
  • Place of Presentation: 名古屋大学東山キャンパス(名古屋市)
  • Year and Date: 20131217-19
• [Presentation] Transient Aerodynamics of Road Vehicles during Pitching Oscillation (2013)
  • Author(s): Cheng See Yuan, Makoto Tsubokura, Takuji Nakashima, Yoshihiro Okada, Takahide Nouzawa
  • Organizer: 2nd International Conference on Recent Advances in Automotive Engineering & Mobility Research (ReCAR 2013)
  • Place of Presentation: hotel Furama, Kala Lumpur, Malaysia
  • Year and Date: 20131216-18
• [Presentation] 実車数値風洞の開発 (2013)
  • Author(s): 坪倉誠
  • Organizer: 日本機械学会第91期流体工学部門講演会フォーラム「京を利用した先端的産業応用事例とスパコンによる流体工学研究の新たな展開」
  • Place of Presentation: 九州大学伊都キャンパス(福岡市)
  • Year and Date: 20131109-10
• [Presentation] 自動車の旋回および滑り運動により生じる空気力について (2013)
  • Author(s): 中島卓司,岡田義浩,坪倉誠,農沢隆秀,土井康明
  • Organizer: 自動車技術会2013年秋季大会
  • Place of Presentation: 名古屋国際会議場(名古屋市)(46-20135844)
  • Year and Date: 20131023-25
• [Presentation] Unsteady aerodynamics of a road vehicle with transient yaw angle change (2013)
  • Author(s): Daiki Matsumoto, Makoto Tsubokura, Keiji Onishi, Takuji Nakashima, Thomas Indinger, Johannes Wojciak
  • Organizer: 自動車技術会2013年秋季大会
  • Place of Presentation: 名古屋国際会議場(名古屋市)
  • Year and Date: 20131023-25
• [Presentation] 自動車が旋回および滑り運動時に生じる流体力の曳航水槽模型実験 (2013)
  • Author(s): 藤原創太,中島卓司,土井康明,岡田義浩,農沢隆秀,坪倉誠
  • Organizer: 日本流体力学会年会2013
  • Place of Presentation: 東京農工大学小金井キャンパス(小金井市)
  • Year and Date: 20130912-14
• [Presentation] 大規模計算の産業応用 (2013)
  • Author(s): 坪倉誠
  • Organizer: 日本機械学会2013年度年次大会ワークショップ「CFDの産業活用における方向性」
  • Place of Presentation: 岡山大学津島キャンパス(岡山市)(W011001)
  • Year and Date: 20130909-11
• [Presentation] HPC-LESによる自動車の次世代非定常空力解析 (2013)
  • Author(s): 坪倉誠,大西慶治,中島卓司
  • Organizer: 日本機械学会2013年度年次大会
  • Place of Presentation: 岡山大学津島キャンパス(岡山市)(J011013)
  • Year and Date: 20130908-11
• [Presentation] A Numerical Analysis of Unsteady Aerodynamics of Road Vehicle during Lane-Change Maneuvering (2013)
  • Author(s): Jun Iketa, Makoto Tsubokura, Yusuke Nakae, Takuji Nakashima, Jun Yamamura, Hiroshi Tanaka, Tsuyoshi Yasuki
  • Organizer: Proceedings of the ASME 2013 Fluids Engineering Summer Meeting
  • Place of Presentation: Hyatt Regency Lake Tahoe Resort, Spa & Casino, Incline Village, Nevada, USA(FEDSM2013-16447)
  • Year and Date: 20130707-11
• [Presentation] Unsteady Aerodynamics Simulation of a Road Vehicle Running with Cyclic Yaw and Side-Slip Motions (2013)
  • Author(s): Takuji Nakashima, Yoshihiro Okada, Takahide Nouzawa, Makoto Tsubokura
  • Organizer: 31st AIAA Applied Aerodynamics Conference
  • Place of Presentation: Sheraton San Diego, San Diego, CA(AIAA-2013-3041)
  • Year and Date: 20130624-27
• [Presentation] Aerodynamic Pitching Stability of Sedan-Type Vehicles Influenced by Pillar-Shape Configurations (2013)
  • Author(s): Cheng, S.Y., Tsubokura, M., Okada, Y., Nakashima, T., Nouzawa, T.
  • Organizer: 2013 SAE World Congress
  • Place of Presentation: Cobo Center, Detroit, Michigan, USA(2013-01-1258, pp.203-212)
  • Year and Date: 20130416-18
• [Presentation] Unsteady Aerodynamics of Road Vehicle in Dynamic Maneuvering (2012)
  • Author(s): Tsubokura, M., Kobayashi, R., Ikawa, Y., Nakashima, T., Okada, Y., Kamioka, T., Nouzawa, T.
  • Organizer: 30th Applied Aerodynamics Conference
  • Place of Presentation: Sheraton New Orleans, New Orleans(AIAA2012-3128)
  • Year and Date: 20120625-28
• [Presentation] Effects of Transient Aerodynamics on Vehicle Stability : A Large Eddy Simulation Analysis (2012)
  • Author(s): Cheng, S.Y., Tsubokura, M., Nakashima, T., Okada, Y., Nouzawa, T.
  • Organizer: 30th AIAA Applied Aerodynamics Conference
  • Place of Presentation: Sheraton New Orleans, New Orleans(AIAA2012-3127)
  • Year and Date: 20120625-28
• [Presentation] A Numerical Study of Transient Aerodynamics of Vehicles Subjected to Pitching Oscillation (2012)
  • Author(s): Tsubokura, M., Cheng, S.Y., Nakashima, T., Okada, Nouzawa, T.
  • Organizer: 9th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements
  • Place of Presentation: Macedonia Palace Hotel, Thessaloniki, Greece(N0030)
  • Year and Date: 20120606-08
• [Presentation] Unsteady vehicle aerodynamics during a dynamic steering action : 2nd report, Numerical analysis (2012)
  • Author(s): Tsubokura, M., Ikawa, Y., Okada, Y., Nakashima, T., Nouzawa, T.
  • Organizer: 2012 SAE World Congress
  • Place of Presentation: Cobo Center, Detroit(2012-01-0448, pp.395-412)
  • Year and Date: 20120424-26
• [Presentation] Unsteady vehicle aerodynamics during a dynamic steering action : 1st report, On-road analysis (2012)
  • Author(s): Okada, Y., Nouzawa, T., Okamoto, S., Fujita, T., Kamioka, T., Tsubokura, M.
  • Organizer: 2012 SAE World Congress
  • Place of Presentation: Cobo Center, Detroit(2012-01-0446, pp.355-377)
  • Year and Date: 20120424-26
• [Presentation] 自動車のホイール回転が車両空力に及ぼす影響に関するLES解析 (2012)
  • Author(s): 池田隼,坪倉誠,小林竜也,長谷川巧,小森谷徹
  • Organizer: 第26回数値流体力学シンポジウム
  • Place of Presentation: 国立オリンピック記念青少年総合センター(渋谷区)(D06-2)
  • Year and Date: 2012-12-19
• [Presentation] High-Performance Computing Large-Eddy Simulation for Next-Generation Vehicle Aerodynamics (2012)
  • Author(s): Makoto Tsubokura
  • Organizer: Korea-Japan CFD Workshop 2012
  • Place of Presentation: Busan National Univ., Korea
  • Year and Date: 2012-11-23
• [Presentation] 自動車実走行時に作用する空力減衰効果とその発生メカニズム (2012)
  • Author(s): チェンシユアン,坪倉誠,中島卓司,岡田義浩,農沢隆秀
  • Organizer: 日本流体力学会年会2012
  • Place of Presentation: 高知大学
  • Year and Date: 2012-09-16
• [Presentation] Large Eddy Simulation on the Unsteady Aerodynamics of a Heavy Duty Truck in Wind Gust (2011)
  • Author(s): Makoto Tsubokura, Prasanjit Das, Tomofuyu Matsuuki, and Takuji Nakashima
  • Organizer: Proceedings of ASME-JSME-KSME Joint Fluids Engineering Conference 2011
  • Place of Presentation: ACT City Congress Center, Hamamatsu, Shizuoka, Japan(AJK2011-FED, AJK2011-23034)
  • Year and Date: 20110724-29
• [Presentation] Development of an Unsteady Aerodynamic Simulator for Road Vehicle based on Large-Eddy Simulation (2011)
  • Author(s): Makoto Tsubokura, Takuji Nakashima
  • Organizer: ASME-JSME-KSME Joint Fluids Engineering Conference 2011
  • Place of Presentation: ACT City Congress Center, Hamamatsu, Japan(AJK2011-42010)
  • Year and Date: 20110724-29
• [Presentation] Unsteady Aerodynamics Simulation of a Heavy Duty Truck in Wind Gusts Coupled with Vechicle Motion Analysis in Six Degrees of Freedom (2011)
  • Author(s): Takuji Nakashima, Makoto Tsubokura, Syumei Matsuda, and Yasuaki Doi
  • Organizer: Proceedings of ASME-JSME-KSME Joint Fluids Engineering Conference 2011
  • Place of Presentation: ACT City Center, Hamamatsu, Shizuoka, Japan(AJK2011-FED, AJK2011-23031)
  • Year and Date: 20110724-29
• [Presentation] On the Aerodynamics of Ground Vehicles Subjected to Crosswind Gust and its Shape Dependence (2011)
  • Author(s): Makoto Tsubokura, Jun Ikeda, Takuji Nakashima, Kozo Kitoh, and Shinji Kitayama
  • Organizer: 29th AIAA Applied Aerodynamics Conference
  • Place of Presentation: Sheraton Waikiki, Honolulu, Hawaii(AIAA2011-3670)
  • Year and Date: 20110627-30
• [Presentation] Large Eddy Simulation of Flow past Road Vehicles Subjected to Pitching Oscillation (2011)
  • Author(s): Cheng Seeyuan, Makoto Tsubokura, Takuji Nakashima, Takahide Nouzawa, and Yoshihiro Okada
  • Organizer: 20th AIAA Computational Fluid Dynamics Conference
  • Place of Presentation: Sheraton Waikiki, Honolulu, Hawaii(AIAA2011-3065)
  • Year and Date: 20110627-30
• [Presentation] Coupled Analysis of Unsteady Aerodynamics and 6DoF Motion of a Heavy Duty Truck in Stonrg Wing Gusts (2011)
  • Author(s): Takuji Nakashima, Makoto Tsubokura, Syumei Matsuda, and Yasuaki Doi
  • Organizer: 29th AIAA Applied Aerodynamics Conference
  • Place of Presentation: Shearaton Waikiki, Honolulu, Hawaii(AIAA2011-3672)
  • Year and Date: 20110627-30
• [Presentation] 蛇行する自動車に作用する非定常空力応答に関するLES解析 (2011)
  • Author(s): 池田隼,坪倉誠,伊川雄希,中島卓司,農沢隆秀,岡田義浩
  • Organizer: 第25回数値流体力学シンポジウム
  • Place of Presentation: 大阪大学コンベンションセンター(A05-2)
  • Year and Date: 2011-12-19
• [Remarks]
  • URL: http://www.eng.hokudai.ac.jp/labo/fluid/aero/