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Numerical analysis of a vehicle wake with tapered rear extensions under yaw conditions.

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Title: Numerical analysis of a vehicle wake with tapered rear extensions under yaw conditions.
Authors: Urquhart, Magnus1 magnus.urquhart@chalmers.se, Sebben, Simone1, Sterken, Lennert2
Source: Journal of Wind Engineering & Industrial Aerodynamics. Aug2018, Vol. 179, p308-318. 11p.
Subjects: Numerical analysis, Yawing (Aerodynamics), Computer simulation, Groundwater flow, Base flow (Aerodynamics)
Abstract: In recent years, governmental legislation and consumer demands are driving the development of more energy efficient road vehicles. One of the aspects considered when increasing efficiency is the aerodynamic performance of the vehicle. The focus of this paper is on wake effects for a vehicle with tapered rear extensions in side wind conditions. For this purpose, numerical simulations are analysed using post-processing techniques such as Proper Orthogonal Decomposition (POD) and Two-point correlation. The extensions protrude 150 mm from the perimeter of the base and are investigated in two configurations: with a smooth taper and with an added kick. The kick realigns the perimeter base flow to the vehicle's driving direction. As the oncoming flow angularity is increased, drag increases for the investigated angles. The smooth extensions provide the greatest drag improvement at 0° yaw while the extensions with a kick yield additional benefits at yaw, effectively reducing the vehicles drag sensitivity to side wind. A large scale twisting motion is present at yaw for the baseline and smooth extensions configurations which is reduced when adding a kick to the extension. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Wind Engineering & Industrial Aerodynamics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 130911174
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Numerical analysis of a vehicle wake with tapered rear extensions under yaw conditions.
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  Data: <searchLink fieldCode="AR" term="%22Urquhart%2C+Magnus%22">Urquhart, Magnus</searchLink><relatesTo>1</relatesTo><i> magnus.urquhart@chalmers.se</i><br /><searchLink fieldCode="AR" term="%22Sebben%2C+Simone%22">Sebben, Simone</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sterken%2C+Lennert%22">Sterken, Lennert</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Wind+Engineering+%26+Industrial+Aerodynamics%22">Journal of Wind Engineering & Industrial Aerodynamics</searchLink>. Aug2018, Vol. 179, p308-318. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Numerical+analysis%22">Numerical analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Yawing+%28Aerodynamics%29%22">Yawing (Aerodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Groundwater+flow%22">Groundwater flow</searchLink><br /><searchLink fieldCode="DE" term="%22Base+flow+%28Aerodynamics%29%22">Base flow (Aerodynamics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In recent years, governmental legislation and consumer demands are driving the development of more energy efficient road vehicles. One of the aspects considered when increasing efficiency is the aerodynamic performance of the vehicle. The focus of this paper is on wake effects for a vehicle with tapered rear extensions in side wind conditions. For this purpose, numerical simulations are analysed using post-processing techniques such as Proper Orthogonal Decomposition (POD) and Two-point correlation. The extensions protrude 150 mm from the perimeter of the base and are investigated in two configurations: with a smooth taper and with an added kick. The kick realigns the perimeter base flow to the vehicle's driving direction. As the oncoming flow angularity is increased, drag increases for the investigated angles. The smooth extensions provide the greatest drag improvement at 0° yaw while the extensions with a kick yield additional benefits at yaw, effectively reducing the vehicles drag sensitivity to side wind. A large scale twisting motion is present at yaw for the baseline and smooth extensions configurations which is reduced when adding a kick to the extension. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Wind Engineering & Industrial Aerodynamics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=130911174
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.jweia.2018.06.001
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 308
    Subjects:
      – SubjectFull: Numerical analysis
        Type: general
      – SubjectFull: Yawing (Aerodynamics)
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Groundwater flow
        Type: general
      – SubjectFull: Base flow (Aerodynamics)
        Type: general
    Titles:
      – TitleFull: Numerical analysis of a vehicle wake with tapered rear extensions under yaw conditions.
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            NameFull: Urquhart, Magnus
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            NameFull: Sebben, Simone
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            NameFull: Sterken, Lennert
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          Dates:
            – D: 01
              M: 08
              Text: Aug2018
              Type: published
              Y: 2018
          Identifiers:
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              Value: 01676105
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              Value: 179
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            – TitleFull: Journal of Wind Engineering & Industrial Aerodynamics
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