turbulence

Flow and turbulence in idealized urban canopies

Flow and turbulence in idealized urban canopies

Flow, turbulence, and dispersion in two- and three-dimensional urban canopies are studied experimentally in a water channel. Velocity measurements are taken using laser velocimetry, while pollutant concentration is measured using image analysis (PLIF).

Indoor Air Pollution

Indoor Air Pollution

The research focuses on the study of air circulation in indoor environments, with particular reference to the measurement of velocity fields and concentrations of chemically passive pollutants originating both from outside the environment and from internal sources. The measurements were conducted using techniques based on laser velocimetry and image analysis.

Turbulence and Mixing at a Density Interface

Turbulence and Mixing at a Density Interface

The research group focuses on analyzing the vertical mixing that characterizes the interface of stratified currents by means of laboratory experiments. Such phenomenon is of fundamental importance in many environmental contexts, such as slope currents generated on mountain slopes, and in many other physical-engineering contexts characterized by turbulent mixing. Velocity measurements are taken using laser velocimetry, while density measurements are taken using image analysis. 

Urban Ventilation

Urban Ventilation

The research focuses on the study of urban ventilation through laboratory experiments conducted in a hydraulic channel. The aim is to improve knowledge of the effect of trees on streets, and in particular how they interact with wind and pollutants emitted by vehicular traffic. The study is conducted on small-scale models, reproducing both ideal cases and real situations, such as small city neighborhoods.

Computational singular perturbation method and tangential stretching rate analysis of large scale simulations of reactive flows: feature tracking, time scale characterization, and cause/effect identification. Part 2, analyses of ignition systems, lam

This chapter provides a review of the basic ideas at the core of the Computational Singular Perturbation (CSP) method and the Tangential Stretching Rate (TSR) analysis. It includes a coherent summary of the theoretical foundations of these two methodologies while emphasizing theirmutual interconnections. The main.

Computational singular perturbation method and tangential stretching rate analysis of large scale simulations of reactive flows: feature tracking, time scale characterization, and cause/effect identification. Part 1, basic concepts

This chapter provides a review of the basic ideas at the core of the Computational Singular Perturbation (CSP) method and the Tangential StretchingRate (TSR) analysis. It includes a coherent summary of the theoretical foundations of these two methodologies while emphasizing theirmutual interconnections. The main.

DNS study of dust particle resuspension in a fusion reactor induced by a transonic jet into vacuum

This paper reports on a two-phase flow Direct Numerical Simulation (DNS) aimed at analyzing the resuspension of solid particles from a surface hit by a transonic jet inside a low pressure container. Conditions similar to those occurring in a fusion reactor vacuum vessel during a Loss of Vacuum Accident (LOVA) have been considered. Indeed, a deep understanding of the resuspension phenomenon is essential to make those reactors safe and suitable for a large-scale sustainable energy production. The jet Reynolds and Mach numbers are respectively set to 3300 and 1.

Application of the exact regularized point particle method (ERPP) to particle laden turbulent shear flows in the two-way coupling regime

The Exact Regularized Point Particle method (ERPP), which is a new inter-phase momentum coupling ap- proach, is extensively used for the first time to explore the response of homogeneous shear turbulence in presence of different particle populations. Particle suspensions with different Stokes number and/or mass loading are considered. Particles with Kolmogorov Stokes number of order one suppress turbulent kinetic energy when the mass loading is increased. In contrast, heavier particles leave this observable almost un- changed with respect to the reference uncoupled case.

Application of the exact regularised point particle method (ERPP) to bubbleladen turbulent shear flows in the two-way coupling regime

Direct Numerical Simulations (DNS) of a bubbly laden homogeneous shear flow has beencarried out using the Exact Regularised Point Particle method (ERRP) as inter-phase mo-mentum coupling approach. The aim of the study consists in addressing the modulationof shear turbulence and the bubble clustering geometry in presence of different inter-phasemomentum coupling conditions. Suspensions with different combinations of void fractionand Kolmogorov-based Stokes number, in the dilute regime, have been addressed. Bubblessuppress the turbulent kinetic energy and turbulent dissipation as well.

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