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DNS of a spatially developing turbulent boundary layer with passive scalar transport
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-4346-4732
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-7864-3071
2009 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 30, no 5, 916-929 p.Article in journal (Refereed) Published
Abstract [en]

A direct numerical simulation (DNS) of a spatially developing turbulent boundary layer over a flat plate under zero pressure gradient (ZPG) has been carried out. The evolution of several passive scalars with both isoscalar and isoflux wall boundary condition are computed during the simulation. The Navier-Stokes equations as well as the scalar transport equation are solved using a fully spectral method. The highest Reynolds number based on the free-stream velocity U-infinity and momentum thickness 0 is Re-0 = 830, and the molecular Prandtl numbers are 0.2, 0.71 and 2. To the authors' knowledge, this Reynolds number is to date the highest with such a variety of scalars. A large number of turbulence statistics for both flow and scalar fields are obtained and compared when possible to existing experimental and numerical simulations at comparable Reynolds number. The main focus of the present paper is on the statistical behaviour of the scalars in the outer region of the boundary layer, distinctly different from the channel-flow simulations. Agreements as well as discrepancies are discussed while the influence of the molecular Prandtl number and wall boundary conditions is also highlighted. A Pr scaling for various quantities is proposed in outer scalings. In addition, spanwise two-point correlation and instantaneous fields are employed to investigate the near-wall streak spacing and the coherence between the velocity and the scalar fields. Probability density functions (PDF) and joint probability density functions (JPDF) are shown to identify the intermittency both near the wall and in the outer region of the boundary layer. The present simulation data will be available online for the research community.

Place, publisher, year, edition, pages
2009. Vol. 30, no 5, 916-929 p.
Keyword [en]
Turbulent boundary layer, Passive scalar, Direct numerical simulation, (DNS), Prandtl number, direct numerical-simulation, low-reynolds-number, near-wall region, channel flow, heat-transfer, prandtl number, temperature-fluctuations, velocity, respect
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-18923DOI: 10.1016/j.ijheatfluidflow.2009.06.007ISI: 000271355100012Scopus ID: 2-s2.0-70249119222OAI: oai:DiVA.org:kth-18923DiVA: diva2:336970
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Simulations of turbulent boundary layers with heat transfer
Open this publication in new window or tab >>Simulations of turbulent boundary layers with heat transfer
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2009. vii, 36 p.
Series
Trita-MEK, ISSN 0348-467X ; 2009:14
Keyword
DNS, LES, Turbulent boundary layer, passive scalar, large-scale structures, massively parallel simulations
Identifiers
urn:nbn:se:kth:diva-11320 (URN)978-91-7415-443-6 (ISBN)
Presentation
2009-10-22, Sal E3, OB 14, Stockholm, Sweden, 15:15 (English)
Opponent
Supervisors
Available from: 2009-10-26 Created: 2009-10-23 Last updated: 2010-10-26Bibliographically approved
2. Direct and Large-Eddy Simulations of Turbulent  Boundary Layers with Heat Transfer
Open this publication in new window or tab >>Direct and Large-Eddy Simulations of Turbulent  Boundary Layers with Heat Transfer
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xv, 83 p.
Series
Trita-MEK, ISSN 0348-467X ; 2011:11
Keyword
direct numerical simulation (DNS), large-eddy simulation (LES), turbulent boundary layer, passive scalar, coherent structures, free-stream t urbulence (FST), structure ensemble dynamics (SED), massively parallel simulations
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-41156 (URN)978-91-7501-101-1 (ISBN)
Public defence
2011-10-10, F3 Sal, Lindstedsv. 26, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Funder
Swedish e‐Science Research Center
Note
QC 20110926Available from: 2011-09-26 Created: 2011-09-23 Last updated: 2012-05-24Bibliographically approved

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Schlatter, PhilippBrandt, LucaHenningson, Dan S.

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