Aerodynamic drag change of vehicle model caused by flow hysteresis under fluctuating crosswind

In the present study, the authors conducted wind tunnel test of simplified vehicle model that show hysteresis of aerodynamic drag during a transient change of aerodynamic yaw angle. Under some conditions where aerodynamic yaw angle fluctuates continuously, time-averaged aerodynamic drag of the simplified vehicle model changed significantly from the quasi-steady evaluation. This time-averaged drag change was considered to be mainly caused by the hysteresis of aerodynamic drag. Based on the time-series measurement of base pressure distribution, the authors indicated the strong relationship between the drag hysteresis and the variation of flow separation point on the model’s rear-end corner at the leeward side.

• Record URL:
  https://doi.org/10.11351/jsaeronbun.50.938
• Record URL:
  https://www.jstage.jst.go.jp/article/jsaeronbun/50/3/50_20194367/_pdf
• 
• Record URL:
  https://scholar.google.com/scholar_lookup?title=Aerodynamic%20drag%20change%20of%20vehicle%20model%20caused%20by%20flow%20hysteresis%20under%20fluctuating%20crosswind&author=T.%20Nakashima&author=K.%20Hamamura&author=K.%20Shimizu&author=T.%20Hiraoka&author=T.%20Nouzawa&publication_year=2019
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02878321
• Authors:
  • Nakashima, Takuji
  • Hamamura, Koumei
  • Shimizu, Keigo
  • Hiraoka, Takenori
  • Nouzawa, Takahide
• Publication Date: 2019-5

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: pp 938-944
• Serial:
  • Transactions of Society of Automotive Engineers of Japan
  • Volume: 50
  • Issue Number: 3
  • Publisher: Society of Automotive Engineers of Japan
  • ISSN: 0287-8321
  • EISSN: 1883-0811
  • Serial URL: https://www.jstage.jst.go.jp/browse/jsaeronbun
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Aerodynamics; Automobiles; Boundary layer separation; Crosswinds; Drag; Hysteresis; Wind tunnels
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01712136
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Jul 22 2019 8:01PM