Roberto Verzicco

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A numerical method is presented which can simulate flows in complex geometries with moving boundaries while still retaining all the advantages and the efficiency of solving the Navier-Stokes equations on cylindrical grids. The boundary conditions are applied independently of the grid by assigning body forces over surfaces that need not coincide with(More)
Direct numerical simulation and stereoscopic particle image velocimetry of turbulent convection are used to gather spatial data for the calculation of structure functions. We wish to add to the ongoing discussion in the literature whether temperature acts as an active or passive scalar in turbulent convection, with consequences for structure-function(More)
Experimental and numerical data for the heat transfer as a function of the Rayleigh, Prandtl, and Rossby numbers in turbulent rotating Rayleigh-Bénard convection are presented. For relatively small Ra approximately 10(8) and large Pr modest rotation can enhance the heat transfer by up to 30%. At larger Ra there is less heat-transfer enhancement, and at(More)
(Received ?? and in revised form ??) Results from direct numerical simulations for three dimensional Rayleigh-Bénard con-vection in a cylindrical cell of aspect ratio 1/2 and P r = 0.7 are presented. They span five decades of Ra from 2 × 10 6 to 2 × 10 11. Good numerical resolution with grid spacing ∼ Kolmogorov scale turns out to be crucial to accurately(More)
Vertically bounded fingering double diffusive convection is numerically investigated, focusing on the influences of different velocity boundary conditions, i.e., the no-slip condition, which is inevitable in the lab-scale experimental researches, and the free-slip condition, which is an approximation for the interfaces in many natural environments, such as(More)
SUMMARY In this paper the wave breaking induced by modulational instability is investigated numerically. The wave train is composed by a fundamental component with two sideband disturbances and the analysis is performed for those conditions in which the instability leads the limiting steepness to be exceeded. Due to the different speeds characterizing(More)
As combustion generated nano-organic particles (NOC) may pose significant health and environmental problems, there is great scientific interest in studying their formation and evolution in turbulent combustion systems. Traditional approaches to turbulent combustion numerical modeling apply Reynolds averaging techniques (RANS) to predict the behavior of the(More)
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