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Aerodynamic Characterisation of a Compact Car Driving Behind a Heavy Vehicle

Wilhelmi, Henning and Jessing, Christoph and Bell, James and Heine, Daniela and Wiedemann, Jochen and Wagner, A. and Wagner, Claus (2021) Aerodynamic Characterisation of a Compact Car Driving Behind a Heavy Vehicle. In: 22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII, 151, pp. 514-524. Springer Nature. 22. STAB/DGLR Symposium 2020, 2020-07-15, Göttingen, Deutschland. doi: 10.1007/978-3-030-79561-0_49. ISBN 978-3-030-79560-3. ISSN 1612-2909.

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Official URL: https://link.springer.com/book/10.1007/978-3-030-79561-0#editorsandaffiliations


The transient incoming flow a compact car experiences whilst driving 10 m – 100 m behind a heavy vehicle on a runway has been characterised. The incoming flow was measured using a 2D array of 11 five-hole probes mounted 1 m in front of an operational, full-scale compact car. Additionally, 188 surface pressure taps were used to measure the effect of the incoming flow conditions on the compact car. The experiments were performed under ideal conditions on a 2.9 km long runway in Faßberg near the DLR in Trauen, Germany. The experiments showed that the heavy vehicle and the distance between the two vehicles have a significant impact on the flow characteristics: with decreasing distances between the vehicles the fluctuations increase from ±0.5 m/s to ±6 m/s and exhibit coherent dominant frequencies at 2.5 Hz in the spanwise direction that are attributed to the vortex shedding in the wake of the heavy vehicle. The turbulence intensities increase from 1% to 25% while the length scales decrease from 25 m to 0.25 m. The change in the incoming flow has a demonstrable influence on the surface pressure of the compact car. The pressure coefficient fluctuates by up to ±0.6 and cp, rms increases from 5% to 30%. The effect of the heavy vehicle on the pressure distribution indicates that the global forces acting on the compact car are influenced.

Item URL in elib:https://elib.dlr.de/136507/
Document Type:Conference or Workshop Item (Other)
Additional Information:Hardcover ISBN 978-3-030-79560-3 Softcover ISBN 978-3-030-79563-4 eBook ISBN 978-3-030-79561-0 Series ISSN 1612-2909 Series E-ISSN 1860-0824
Title:Aerodynamic Characterisation of a Compact Car Driving Behind a Heavy Vehicle
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wilhelmi, HenningUNSPECIFIEDhttps://orcid.org/0000-0002-0086-287XUNSPECIFIED
Jessing, ChristophUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Bell, JamesUNSPECIFIEDhttps://orcid.org/0000-0001-8319-9817UNSPECIFIED
Heine, DanielaUNSPECIFIEDhttps://orcid.org/0000-0001-7967-5542UNSPECIFIED
Wiedemann, JochenUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:14 July 2021
Journal or Publication Title:22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 514-524
EditorsEmailEditor's ORCID iDORCID Put Code
Krämer, EwaldInstitut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Keywords:overtaking, platooning, on-road, aerodynamics, real-world, drag, wake Überholmanöver, Straßenfahrt, Aerodynamik, Widerstand, Nachlauf
Event Title:22. STAB/DGLR Symposium 2020
Event Location:Göttingen, Deutschland
Event Type:international Conference
Event Date:15 July 2020
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Wilhelmi, Henning
Deposited On:09 Dec 2020 11:40
Last Modified:24 Apr 2024 20:38

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