Non-symmetric bi-stable flow around the Ahmed body

Walter Meile, Thomas Ladinek, Günter Brenn, Aaron Reppenhagen, Anton Fuchs

Research output: Contribution to journalArticlepeer-review


The flow around the Ahmed body at varying Reynolds numbers under yawing conditions is investigated experimentally. The body geometry belongs to a regime subject to spanwise flow instability identified in symmetric flow by Cadot and co-workers (Grandemange et al., 2013b). Our experiments cover the two slant angles 25° and 35° and Reynolds numbers up to 2.784 × 106. Special emphasis lies on the aerodynamics under side wind influence. For the 35° slant angle, forces and moments change significantly with the yawing angle in the range 10° ≤ |β| ≤ 15°. The lift and the pitching moment exhibit strong fluctuations due to bi-stable flow around a critical angle β of ±12.5°, where the pitching moment changes sign. Time series of the forces and moments are studied and explained by PIV measurements in the flow field near the rear of the body.
Original languageEnglish
Pages (from-to)34-47
JournalInternational Journal of Heat and Fluid Flow
Publication statusPublished - 2016

Fields of Expertise

  • Mobility & Production


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