Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Direct numerical simulations of variable-aspect-ratio turbulent duct flows at low to moderate reynolds numbers
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0002-0889-5190
Show others and affiliations
2013 (English)In: International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, TSFP-8 , 2013Conference paper, Published paper (Refereed)
Abstract [en]

Three-dimensional effects in turbulent duct flows, i.e., side-wall boundary layers and secondary motions, are studied by means of direct numerical simulations (DNS). The spectral element code Nek5000 is used to compute turbulent duct flows with aspect ratios 1 to 7 (at Reb, c = 2800, Reτ 180) and 1 (at Reb, c = 5600, Reτ 330) in streamwiseperiodic boxes of length 25h. The total number of grid points ranges from 28 to 145 million, and the fluid kinematic viscosity n was adjusted iteratively in order to keep the same bulk Reynolds number at the centerplane with changing aspect ratio. Spanwise variations in wall shear, mean-flow profiles and turbulence statistics are analyzed with aspect ratio, and also compared with the 2D channel. These computations show good agreement with experimental measurements carried out at IIT in parallel, and reinforces one important conclusion: the conditions obtained in the core region of a high-aspect-ratio duct cannot exactly be reproduced by spanwise-periodic DNSs of turbulent channel flows.

Place, publisher, year, edition, pages
TSFP-8 , 2013.
Keywords [en]
Boundary layers, C (programming language), Channel flow, Direct numerical simulation, Ducts, Numerical models, Reynolds number, Shear flow, Turbulence, Wall flow, High aspect ratio, Mean flow profiles, Moderate Reynolds numbers, Spanwise variations, Spectral element, Three dimensional effect, Turbulence statistics, Turbulent channel flows, Aspect ratio
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-222979Scopus ID: 2-s2.0-85034016810ISBN: 9780000000002 OAI: oai:DiVA.org:kth-222979DiVA, id: diva2:1193266
Conference
8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, 28 August 2013 through 30 August 2013
Note

QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-05-24Bibliographically approved

Open Access in DiVA

No full text in DiVA

Scopus

Authority records BETA

Noorani, AzadEl-khoury, JadSchlatter, Philipp

Search in DiVA

By author/editor
Noorani, AzadEl-khoury, JadSchlatter, Philipp
By organisation
MechanicsMachine Design (Dept.)Linné Flow Center, FLOWSeRC - Swedish e-Science Research Centre
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 10 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf