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Investigation of Transient Aerodynamic Effects on Public Roads in Comparison to Individual Driving Situations on a Test Site

Jessing, Christoph and Wilhelmi, Henning and Wittmeier, Felix and Wagner, Andreas and Wiedemann, Jochen and Dillmann, Andreas (2020) Investigation of Transient Aerodynamic Effects on Public Roads in Comparison to Individual Driving Situations on a Test Site. SAE International Journal of Advances and Current Practices in Mobility, 1 (0670), pp. 2585-2595. SAE International. doi: 10.4271/2020-01-0670. ISSN 2641-9637.

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Official URL: https://doi.org/10.4271/2020-01-0670

Abstract

Natural wind, roadside obstacles, terrain roughness, and traffic influence the incident flow of a vehicle driven on public roads. These transient on-road conditions differ from the idealized statistical steady-state flow environment utilized in CFD simulations and wind tunnel experiments. To understand these transient on-road conditions better, measurements were performed on German public highways and on a test site. A compact car was equipped with a measurement system that is capable of determining the transient airflow around the vehicle and the vehicle’s actual driving state. This vehicle was driven several times on a predefined 200 km long route to investigate different traffic densities on public highways in southern Germany. During the tests the transient incident flow and pressure distribution on the vehicle surface were measured. With the same test vehicle, individual driving situations were recreated on a test site under weather conditions similar to those of the tests on public roads. This paper presents a comparison of the aerodynamic characteristics measured on public highways and on the test site. Two driving situations were examined at the test site: one is driving the test vehicle without traffic and the other is driving behind a box truck in different distances. This paper compares the realistic properties of the turbulent flow structures and the surface pressure around the vehicle during on-road driving in public traffic with those measured on the testing site. The purpose of this study is to investigate the possibility of reproducing the representative driving on public highways with a simplified approach.

Item URL in elib:https://elib.dlr.de/137432/
Document Type:Article
Additional Information:ISSN: 2641-9637 e-ISSN: 2641-9645
Title:Investigation of Transient Aerodynamic Effects on Public Roads in Comparison to Individual Driving Situations on a Test Site
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jessing, ChristophUniversität Stuttgart, IVKUNSPECIFIED
Wilhelmi, HenningHenning.Wilhelmi (at) dlr.dehttps://orcid.org/0000-0002-0086-287X
Wittmeier, FelixUniversität Stuttgart, IVKUNSPECIFIED
Wagner, AndreasUniversität Stuttgart, IVKUNSPECIFIED
Wiedemann, JochenUniversität Stuttgart, IVKUNSPECIFIED
Dillmann, AndreasAndreas.Dillmann (at) dlr.deUNSPECIFIED
Date:14 April 2020
Journal or Publication Title:SAE International Journal of Advances and Current Practices in Mobility
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:1
DOI :10.4271/2020-01-0670
Page Range:pp. 2585-2595
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDSAE InternationalUNSPECIFIED
Publisher:SAE International
ISSN:2641-9637
Status:Published
Keywords:on-road measurement, aerodynamics, unsteady flow, test-track, driving behind
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Institute for Aerodynamics and Flow Technology > Administration AS-GO
Deposited By: Wilhelmi, Henning
Deposited On:11 Nov 2020 23:19
Last Modified:20 Nov 2020 11:54

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