Reynolds number dependence of particle resuspension in turbulent duct flows

Dissipative Particle Dynamics Modelling of Low Reynolds Number Incompressible Flows

Reynolds number dependence of scalar fluctuations in a high Schmidt number turbulent jet

The scalar rms fluctuations in a turbulent jet were investigated experimentally, using highresolution, laser-induced fluorescence techniques. The experiments were conducted in a high Schmidt nuinber fluid (water), on the jet centerline, over a jet Reynolds number range of 3000<Re<24 000. It was found that the normalized scalar rms fluctuations c’/ C decrease with increasing flow Reynolds number...

Prandtl and Rayleigh number dependence of the Reynolds number in turbulent thermal convection.

The Prandtl and Rayleigh number dependences of the Reynolds number in turbulent thermal convection following from the unifying theory by Grossmann and Lohse [J. Fluid Mech. 407, 27 (2000); Phys. Rev. Lett. 86, 3316 (2001)] are presented and compared with various recent experimental findings. This dependence Re(Ra,Pr) is more complicated than a simple global power law. For Pr=5.5 and 10(8)<Ra<10...

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...

Reynolds-number-dependent turbulent inertia and onset of log region in pipe flows

A detailed analysis of the ‘turbulent inertia’ (TI) term (the wall-normal gradient of the Reynolds shear stress, d〈−uv〉/dy), in the axial mean momentum equation is presented for turbulent pipe flows at friction Reynolds numbers δ+ ≈ 500, 1000 and 2000 using direct numerical simulation. Two different decompositions for TI are employed to further understand the mean structure of wall turbulence. ...