Inflow length and tripping effects in turbulent boundary layers
2011 (English)In: 13TH European Turbulence Conference (ETC13): Wall-Bounded Flows And Control Of Turbulence, Institute of Physics Publishing (IOPP), 2011, 022018- p.Conference paper (Refereed)
A recent assessment of available direct numerical simulation (DNS) data from turbulent boundary layer flows [Schlatter & Orlu, J. Fluid Mech. 659, 116 (2010)] showed surprisingly large differences not only in the skin friction coefficient or shape factor, but also in their predictions of mean and fluctuation profiles far into the sublayer. For the present paper the DNS of a zero pressure-gradient turbulent boundary layer flow by Schlatter et al. [Phys. Fluids 21, 051702 (2009)] serving as the baseline simulation, was re-simulated, however with physically different inflow conditions and tripping effects. The downstream evolution of integral and global quantities as well as mean and fluctuation profiles are presented and results indicate that different inflow conditions and tripping effects explain most of the differences observed when comparing available DNS. It is also found, that if transition is initiated at a low enough Reynolds number (based on the momentum-loss thickness) Re-theta < 300, all data agree well for both inner and outer layer for Re-theta > 2000; a result that gives a lower limit for meaningful comparisons between numerical and/or wind tunnel experiments.
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2011. 022018- p.
, Journal of Physics: Conference Series (Print), ISSN 1742-6588 ; 318
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-83139DOI: 10.1088/1742-6596/318/2/022018ISI: 000301292300018ScopusID: 2-s2.0-84856339711OAI: oai:DiVA.org:kth-83139DiVA: diva2:498735
13th European Turbulence Conference, ETC13; Warsaw;12 September 2011 through 15 September 2011
QC 201204102012-02-122012-02-122012-04-10Bibliographically approved