Browsing by Subject "Turbulence"
Now showing items 1-20 of 180
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123-321 models of classical novae
(EDP Sciences, 2020-01-28)
Article
Open Access
Covenantee: Università di PisaContext. High-resolution spectroscopy has revealed large concentrations of CNO and sometimes other intermediate-mass elements (e.g., Ne, Na, Mg, or Al, for ONe novae) in the shells ejected during nova outbursts, suggesting ... -
A framework for estimating epistemic uncertainty in LES closures
(2016)
External research report
Open Access -
A measure of flow vorticity with twisted beams of light
(Curran, 2016)
Conference report
Restricted access - publisher's policyThe measurement of vorticity, a parameter providing local measurements of rotation at every point in a flow, would greatly assist research fields as diverse as biology microfluidics, complex motions in the oceanic and ... -
A new subgrid characteristic length for turbulence simulations on anisotropic grids
(2017-11-29)
Article
Open AccessDirect numerical simulations of the incompressible Navier-Stokes equations are not feasible yet for most practical turbulent flows. Therefore, dynamically less complex mathematical formulations are necessary for coarse-grained ... -
A numerical strategy to compute optical parameters in turbulent flow: application to telescopes
(2008-07-29)
Article
Open AccessWe present a numerical formulation to compute optical parameters in a turbulent air flow. The basic numerical formulation is a large eddy simulation (LES) of the incompressible Navier-Stokes equations, which are approximated ... -
A priori study of subgrid-scale features in turbulent Rayleigh-Bénard convection
(2017-10-06)
Article
Open AccessAt the crossroad between flow topology analysis and turbulence modeling, a priori studies are a reliable tool to understand the underlying physics of the subgrid-scale (SGS) motions in turbulent flows. In this paper, ... -
A pseudo-DNS method for the simulation of incompressible fluid flows with instabilities at different scale
(Springer, 2020-01)
Article
Open AccessIn this work, a new model for the analysis of incompressible fluid flows with massive instabilities at different scales is presented. It relies on resolving all the instabilities at all scales without any additional model, ... -
A scalable geometric multigrid method for non-symmetric linear systems arising from elliptic equations
(2015)
External research report
Open Access -
A simple approach to discretize the viscous term with spatially varying (eddy-)viscosity
(2013-11-15)
Article
Restricted access - publisher's policyA simple approach to discretize the viscous dissipation term in the incompressible Navier–Stokes equations with spatially varying viscosity is presented. Unlike the case where the viscosity remains constant, its discretization ... -
Adquisición y tratamiento de datos para la caracterización de las acciones dinámicas en los disipadores de energía hidráulica
(1992-02)
Article
Open AccessLas características de tridimensionalidad, turbulencia anisotrópica y no homogénea que se presentan en el flujo de los disipadores de energía hidráulica, no permiten un estudio analítico del problema, siendo por tanto la ... -
Advances in effective flow separation control for aircraft drag reduction: modeling, simulations and experimentations
(Springer, 2020)
Book
Restricted access - publisher's policyThis book includes a collection of chosen research papers from the partners of a research project (the Seventh Framework Programme Grant Agreement (Grant Number: 266326)) named Manipulation of Reynolds Stress for Separation ... -
Air distribution in street canyons: a CFD study
(Universitat Politècnica de Catalunya, 2019-06-10)
Bachelor thesis
Open AccessHeat island effect and air quality are major issues in big cities and the shape ofthe street canyons is directly related with these problems. The only presence the buildings modifies the temperature in their surroundings ... -
Algoritmos de punto de cambio aplicados a la detección de estructuras vorticosas en flujos turbulentos
(Universitat Politècnica de Catalunya. CIMNE, 2017)
Article
Open AccessEn este trabajo se presenta el análisis de la aplicación del modelo de un algoritmo de punto de cambio (Change Point Model, CPM), basado en tests no paramétricos, para la detección de estructuras turbulentas en un flujo ... -
Analysis of sedimentation and resuspension processes of aquaculture biosolids using an oscillating grid
(2008-01)
Article
Restricted access - publisher's policySedimentation and resuspension processes of aquaculture biosolids (non-ingested feed and faeces) are analysed using vertically oscillating grids as a source of turbulence in fluid tanks. An oscillating grid system consists ... -
Analysis of turbulence in fog episodes
(Copernicus Publications, 2008-04-24)
Article / Conference report
Open AccessMany processes interact in a complex and highly non-linear way during the life cycle of fog, the turbulent transport being among them. Observations and analysis of urbulence are, then, fundamental to our understanding of ... -
Analytical solutions of velocity profile in flow through submerged vegetation with variable frontal width
(Elsevier, 2019-11)
Article
Restricted access - publisher's policyFlow within vegetation is one of the main driving forces for material exchange and energy transfer in wetland systems. Impacted by vegetation, the flow velocity profile illustrates distortions to the classic logarithmic ... -
Análisis del evento de viento fuerte (ventisca) de diciembre del año 2000 en los Pirineos orientales
(Universitat Politècnica de Catalunya, 2019-10-04)
Bachelor thesis
Open AccessOn December 30 of the year 2000, a strong and sudden episode of wind hit the Eastern Pyrenees, causing a severe blizzard. The wind lifted the snow that covered the ground, reducing visibility and causing extreme conditions ... -
Análisis multifractal de procesos autosimilares : imágenes de satélite e inestabilidades baroclinas
(2008-05-05)
Article
Open Access -
Assessment of variational multiscale models for the large eddy simulation of turbulent incompressible flows
(2015-03)
Article
Open AccessIn this work we study the performance of some variational multiscale models (VMS) in the large eddy simulation (LES) of turbulent flows. We consider VMS models obtained by different subgrid scale approximations which include ... -
Atmospheric-turbulence-induced power-fade statistics for a multiaperture optical receiver
(OPTICAL SOC AMER, 1997-01-31)
Article
Open AccessTo estimate the probability distributions of power fades, we consider two basic types of disturbance in electromagnetic wave propagation through atmospheric turbulence: wave-front intensity fluctuations and wave-front ...
