(Received ?? and in revised form ??) We consider the kinematic dynamo problem for a velocity field consisting of a mixture of turbulence and coherent structures. For these flows the dynamo growth rate is determined by a competition between the large eddies that have large magnetic Reynolds number but long turnover times and the small eddies that have low magnetic Reynolds number but short turno...

Rayleigh number (<i>Ra</i>) dependence in Rayleigh-Bénard (RB) convection has been studied by many investigators, but the reported power-law scaling expressions are different these researches. Previous studies have found that when <i>Ra</i> reaches a critical value, flow patterns change and transition appears of <i>Nu</i>(<i>Ra</i>) (where <i&g...

We present an experimental and numerical study of the flow downstream honeycomb straighteners for a range Reynolds numbers, covering both laminar turbulent inside cells. carried out experiments with planar particle image velocimetry (PIV) in wind tunnel performed simulations to perform in-depth investigation three-dimensional field. The individual channel profiles gradually develop into one uni...

The path to turbulence in the wake of cylinders with square crosssection is investigated by means of direct numerical simulation, employing a two-dimensional spectral element method and Floquet linear stability analysis. The critical Reynolds number for the onset of the three-dimensional instability modes A, B, C and QP are reported for cylinder incidence angles between 0° and 45°. The Strouhal...

A spherical drop, placed in a second liquid of the same density, is subjected to shearing between parallel plates. The subsequent flow is investigated numerically with a volume-of-fluid ~VOF! method. The scheme incorporates a semi-implicit Stokes solver to enable computations at low Reynolds number. Our simulations compare well with previous theoretical, numerical, and experimental results. For...