Effect of small roughness elements on thermal statistics of a turbulent boundary layer at moderate Reynolds number

Ali Doosttalab, Guillermo Araya, Jensen Newman, Ronald Adrian, Kenneth Jansen, Luciano Castillo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A zero-pressure-gradient turbulent boundary layer flowing over a transitionally rough surface (24-grit sandpaper) with k+∼11 and a momentum-thickness Reynolds number of approximately 2400 is studied using direct numerical simulation (DNS). Heat transfer between the isothermal rough surface and the turbulent flow with molecular Prandtl number Pr=0.71 is simulated. The dynamic multiscale approach developed by Araya et al. (J. Fluid Mech., vol. 670, 2011, pp. 581-605) is employed to prescribe realistic time-dependent thermal inflow boundary conditions. In general, the rough surface reduces mean and fluctuating temperature profiles with respect to the smooth surface flow when normalized by Wang & Castillo (J. Turbul., vol. 4, 2003, 006) inner/outer scaling. It is shown that the Reynolds analogy does not hold for y+

Original languageEnglish (US)
Pages (from-to)84-115
Number of pages32
JournalJournal of Fluid Mechanics
Volume787
DOIs
StatePublished - Dec 8 2015

Fingerprint

turbulent boundary layer
Reynolds number
Boundary layers
roughness
Surface roughness
Statistics
statistics
grit
Prandtl number
Direct numerical simulation
Pressure gradient
direct numerical simulation
pressure gradients
turbulent flow
temperature profiles
Turbulent flow
Momentum
heat transfer
Boundary conditions
boundary conditions

Keywords

  • turbulent boundary layers
  • turbulent flows

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Effect of small roughness elements on thermal statistics of a turbulent boundary layer at moderate Reynolds number. / Doosttalab, Ali; Araya, Guillermo; Newman, Jensen; Adrian, Ronald; Jansen, Kenneth; Castillo, Luciano.

In: Journal of Fluid Mechanics, Vol. 787, 08.12.2015, p. 84-115.

Research output: Contribution to journalArticle

Doosttalab, Ali ; Araya, Guillermo ; Newman, Jensen ; Adrian, Ronald ; Jansen, Kenneth ; Castillo, Luciano. / Effect of small roughness elements on thermal statistics of a turbulent boundary layer at moderate Reynolds number. In: Journal of Fluid Mechanics. 2015 ; Vol. 787. pp. 84-115.
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