Reynolds number scaling of particle clustering in turbulent aerosols

Reynolds number effects in stratified turbulent wakes

We report large-eddy simulations of the turbulent wake of a towed-sphere of diameter D at speed U in a linearly stratified Boussinesq fluid with buoyancy frequency N . These simulations are performed using a spectral-multidomain-penalty-method-based incompressible Navier-Stokes solver for Re ≡ UD/ν ∈ {5 × 10, 10, 4 × 10} and Fr ≡ 2U/(ND) ∈ {4, 16, 64}. Increasingly richer turbulent fine structu...

Multiscale geometry and scaling of the turbulent-nonturbulent interface in high Reynolds number boundary layers.

The scaling and surface area properties of the wrinkled surface separating turbulent from nonturbulent regions in open shear flows are important to our understanding of entrainment mechanisms at the boundaries of turbulent flows. Particle image velocimetry data from high Reynolds number turbulent boundary layers covering three decades in scale are used to resolve the turbulent-nonturbulent inte...

Model-based scaling of the streamwise energy density in high-Reynolds-number turbulent channels

We study the Reynolds-number scaling and the geometric self-similarity of a gainbased, low-rank approximation to turbulent channel flows, determined by the resolvent formulation of McKeon & Sharma (J. Fluid Mech., vol. 658, 2010, pp. 336–382), in order to obtain a description of the streamwise turbulence intensity from direct consideration of the Navier–Stokes equations. Under this formulation,...

Anomalous Reynolds-number scaling in turbulent Rayleigh--B{e}nard convection

This paper reports measurements of Reynolds numbers R e corresponding to the turnover time of thermal excitations (‘plumes’) and Rω e corresponding to the twisting-oscillation period of the large-scale circulation (LSC) of turbulent Rayleigh–Bénard convection over the Rayleigh-number range 2 × 108 R 1011 and Prandtl-number range 3.3 σ 29 for cylindrical samples of aspect ratio Γ = 1. For R < R∗...

Effect of Reynolds Number in the Turbulent-flow Range