0

Full Content is available to subscribers

Subscribe/Learn More  >

Streamwise Variations in Turbulence Statistics in Drag-Reducing Turbulent Boundary Layer of Viscoelastic Fluids

[+] Author Affiliations
Shinji Tamano, Yohei Morinishi

Nagoya Institute of Technology, Nagoya, Aichi, Japan

Michael D. Graham

University of Wisconsin-Madison, Madison, WI

Paper No. AJK2011-25001, pp. 3853-3863; 11 pages
doi:10.1115/AJK2011-25001
From:
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
  • Hamamatsu, Japan, July 24–29, 2011
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4440-3
  • Copyright © 2011 by JSME

abstract

Direct numerical simulation (DNS) of a zero-pressure gradient drag-reducing turbulent boundary layer of viscoelastic fluids was performed at the different Weissenberg number We = 25, 50, 75, and 100 using the FENE-P model. The increase in We, i.e. the relaxation time leads to the larger maximum of trace of conformation tensor in upstream region, and to the larger maximum of drag reduction ratio DR in downstream region, in which the trace of conformation tensor decreases gradually in the streamwise direction, while the DR increases. The trace of conformation tensor is anticorrelated with DR, While the phase difference between DR and streamwise turbulence intensity becomes larger with the increase in We. Streamwise variations in DR, turbulence statistics and structures are so different between We = 25 and We = 50 to 100, and the difference is elucidated by using the active and hibernating turbulence mechanism of Xi and Graham (2010b) for the minimal channel flow. At We = 25, the locally high and low wall-shear stress regions show larger scale compared to Newtonian fluid. On the other hand, at We = 50, regions of active and hibernating turbulence become obscurer, while the mechanism itself is unchanged.

Copyright © 2011 by JSME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In