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 language | English (US) |
|---|---|
| Pages (from-to) | 84-115 |
| Number of pages | 32 |
| Journal | Journal of Fluid Mechanics |
| Volume | 787 |
| DOIs | |
| State | Published - Dec 8 2015 |
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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 journal › Article
}
TY - JOUR
T1 - Effect of small roughness elements on thermal statistics of a turbulent boundary layer at moderate Reynolds number
AU - Doosttalab, Ali
AU - Araya, Guillermo
AU - Newman, Jensen
AU - Adrian, Ronald
AU - Jansen, Kenneth
AU - Castillo, Luciano
PY - 2015/12/8
Y1 - 2015/12/8
N2 - 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+
AB - 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+
KW - turbulent boundary layers
KW - turbulent flows
UR - http://www.scopus.com/inward/record.url?scp=84949599366&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84949599366&partnerID=8YFLogxK
U2 - 10.1017/jfm.2015.676
DO - 10.1017/jfm.2015.676
M3 - Article
AN - SCOPUS:84949599366
VL - 787
SP - 84
EP - 115
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
ER -