Scaling of statistics in wall-bounded turbulent flows

Abstract

Scaling of statistics in wall-bounded turbulent flows Lois d'échelle des moments statistiques pour des écoulements turbulents pariétaux

Influence of the transient airflow pattern on the temporal evolution of microparticle resuspension: Application to ventilated duct during fan acceleration

“…The dimensionless vertical velocity profiles u þ ¼ f(y þ ) are presented in Figure 2. For y þ ¼ 3 to 8 (i.e., the y þ range concerning the viscous sublayer), these profiles are in good agreement with profiles reported by Keirsbulck et al (2012) and obtained by experimental measurements and DNS simulations, and allow determining the y þ ranges corresponding to the different zones of the boundary layer: the logarithmic law involves y þ values higher than 30 and the viscous sublayer corresponds to y þ ¼ 0-8. For each mean velocity the y value corresponding to y þ ¼ 8, i.e., the viscous sublayer thickness, is given in Table 2.…”

Statistical properties of wall shear stress fluctuations in turbulent channel flows

“…7, and is consistent with the one found in literature (Khoo et al, 2001). Note that the wall shear stress and velocity fluctuations are directly related to each other in the vicinity of the wall, and as such could be directly compared as done by the present authors in a separate publication (Keirsbulck et al, 2012). A long positive probabilitydensity-function tail indicates much more frequent positive fluctuations consistent with a positive skewness factor.…”

Scaling and flow dependencies over forward-facing steps

“…The facility can operates in a velocity range from 0.5 to 60m s with a low inlet turbulent intensity (0.6 % of free stream velocity). More details about the facility can be found in Keirsbulck et al [16]. A scheme of the present forwardfacing step configuration is given in Fig.…”