1,721,198 research outputs found
Sistema a luci laser posizionate su veicoli per la guida stradale sicura in presenza di nebbia e/o di tracciati non lineari
Full text linkSistema a luci laser posizionate su veicoli per la guida stradale sicura in presenza di nebbia e/o di tracciati non lineari / A system for helping the driving of a vehicle in presence of fog and/or on irregular roads
No full textPrevenzione degli incidenti stradali in presenza di nebbia mediante fari con luci laser
No full textL’articolo riguarda un sistema basato su semplici luci laser installate sui veicoli, per una guida stradale più sicura in presenza di nebbia o di tracciati non lineari. Esso prevede, per ogni veicolo, un emettitore di luce laser nella parte anteriore e due emettitori posteriori di luci laser; la proiezione di un fascio di luce posteriore sul manto stradale permette d’allertare i veicoli inseguitori in quanto i conducenti possono rilevarne la presenza prima di poter scorgere il veicolo che li proietta
A 3D numerical model for turbidity currents
Full text linkA numerical model that solves two-phase flow motion equations to reproduce turbidity currents that occur in reservoirs, is proposed. Three formalizations of the two-phase flow motion equations are presented: the first one can be adopted for high concentration values; the second one is valid under the hypothesis of diluted concentrations; the third one is based on the assumption that the particles are in translational equilibrium with the fluid flow. The proposed numerical model solves the latter formalization of two-phase flow motion equations, in order to simulate turbidity currents. The motion equations are presented in an integral form in time-dependent curvilinear coordinates, with the vertical coordinate that varies in order to follow the free surface movements. The proposed numerical model is validated against experimental data and is applied to a practical engineering case study of a reservoir, in order to evaluate the possibility of the formation of turbidity currents
Hydrodynamic effects produced by submerged breakwaters in a coastal area with a curvilinear shoreline
Full text linkA three-dimensional numerical study of the hydrodynamic effect produced by a system of submerged breakwaters in a coastal area with a curvilinear shoreline is proposed. The three-dimensional model is based on an integral contravariant formulation of the Navier-Stokes equations in a time-dependent curvilinear coordinate system. The integral form of the contravariant Navier-Stokes equations is numerically integrated by a finite-volume shock-capturing scheme which uses Monotonic Upwind Scheme for Conservation Laws Total Variation Diminishing (MUSCL-TVD) reconstructions and an Harten Lax van Leer Riemann solver (HLL Riemann solver). The numerical model is used to verify whether the presence of a submerged coastal defence structure, in the coastal area with a curvilinear shoreline, is able to modify the wave induced circulation pattern and the hydrodynamic conditions from erosive to accretive
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