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Moving Model Investigation of Unsteady-Crosswind Ground-Vehicle Aerodynamics / Untersuchung instationärer Seitenwinde in der Aerodynamik bodengebundener Fahrzeuge anhand der Methode bewegter Modelle

Bechthold, Max (2020) Moving Model Investigation of Unsteady-Crosswind Ground-Vehicle Aerodynamics / Untersuchung instationärer Seitenwinde in der Aerodynamik bodengebundener Fahrzeuge anhand der Methode bewegter Modelle. Bachelor's, Georg-August-Universität Göttingen.

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Abstract

A vehicles performance, efficiency and safety depends on the aerodynamic conditions it is operating in. Unsteady aerodynamic conditions, such as gusty crosswinds, come with sudden yaw and force transients that can lead to path deviation and fatal accidents. A better understanding of these unsteady conditions is thus fundamental. This work analyses unsteady crosswind events, using a cutting-edge moving-model facility at the German Aerospace Center (DLR) in Göttingen, in which a generic vehicle model is accelerated on a track along a perpendicular side-wind tunnel. A static wind-tunnel setup is used for comparison. Evaluations of the unsteady surface pressures, transient forces and salient flow structures between the steady and unsteady case are compared. Peaks and extended maxima in the force coefficients in the moving-model analysis were found to overshoot the values from the steady analysis. These results suggest that realistic, unsteady crosswind encounters lead to temporary higher forces as steady investigations might predict. Therefore steady-state crosswind simulations can only be taken as a first approximation for the problem, but further investigations should be conducted with unsteady-state-simulating facilities, like the moving-model facility.

Item URL in elib:https://elib.dlr.de/136984/
Document Type:Thesis (Bachelor's)
Title:Moving Model Investigation of Unsteady-Crosswind Ground-Vehicle Aerodynamics / Untersuchung instationärer Seitenwinde in der Aerodynamik bodengebundener Fahrzeuge anhand der Methode bewegter Modelle
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bechthold, MaxUNSPECIFIEDUNSPECIFIED
Date:27 April 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:97
Status:Published
Keywords:unsteady aerodynamics, crosswind, automotive, ground vehicle
Institution:Georg-August-Universität Göttingen
Department:Fakultät für Physik
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Transport und Klima
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Bell, Dr. James
Deposited On:23 Nov 2020 12:50
Last Modified:23 Nov 2020 12:50

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