Browsing by Subject "Turbulència"
Now showing items 1-20 of 178
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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 characteristic length scale for density gradients in supercritical monocomponent flows near pseudoboiling
(2020-12)
Research report
Open Access -
A conservative overlap method for multi-block parallelization of compact finite-volume schemes
(Elsevier, 2017-12)
Article
Open AccessA conservative approach for MPI-based parallelization of tridiagonal compact schemes is developed in the context of multi-block finite-volume methods. For each block, an enlarged linear system is solved by overlapping a ... -
A framework for estimating epistemic uncertainty in LES closures
(2016)
Research report
Open Access -
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 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 scalable geometric multigrid method for non-symmetric linear systems arising from elliptic equations
(2015)
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 ... -
Advanced study for the numerical resolution of the Navier-Stokes equations. Application to thermal energy storage systems
(Universitat Politècnica de Catalunya, 2022-07-19)
Master thesis
Open AccessThe resolution of the Navier Stokes equations in three dimensions in a turbulent regime applying turbulence models is studied. To accomplish this objective, it is done a brief introduction to the work done on the Final ... -
Advanced techniques for grau area mitigation in DES simulations and their effectes on the subsonic round jet acoustic spectra
(2021)
Conference report
Restricted access - publisher's policyThe research dedicated to the investigation of different gray-area mitigation approaches towards accurate aerodynamics and aeroacoustics is presented. The recent modifications of hybrid RANS-LES DDES approach based on ... -
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 ... -
Aggregation of microplastic and biogenic particles in upper-ocean turbulence
(2022-12)
Article
Restricted access - publisher's policyThe aggregation of microplastic and biogenic particles in upper-ocean turbulence is studied by means of direct numerical simulations and Lagrangian tracking of point particles. The range of particle properties (size and ... -
An Investigation of RANS Simulations for Swirl-Stabilized Isothermal Turbulent Flow in a Gas Turbine Burner
(2019-09-09)
Article
Open AccessThe presence of complex flow features in swirling flows have made it an essential part of many engineering applications. These features can only be accurately predicted by the DNS or LES type methods which are highly ... -
Analysis of the effect of the small-scale turbulence on the phytoplankton dynamics in the open ocean. Modelling and numerical simulation in the vertical dimension.
(Universitat Politècnica de Catalunya, 2001-02-02)
Doctoral thesis
Open AccessEs tracta d'una tesi fonamentalment interdisciplinària que aborda l'anàlisi de la dinàmica fitoplanctònica, en condicions de mar obert i en termes de fixació de carboni, en funció de pressos estrictament físics com són la ... -
Analysis of the Near-Wall Flow in a Turbine Cascade by Splat Visualization
(2020-01)
Article
Open AccessTurbines are essential components of jet planes and power plants. Therefore, their efficiency and service life are of central engineering interest. In the case of jet planes or thermal power plants, the heating of the ... -
Analytical solutions of velocity profile in flow through submerged vegetation with variable frontal width
(Elsevier, 2019-11)
Article
Open AccessFlow 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 de flujos turbulentos confinados en un canal usando métodos DNS
(Universitat Politècnica de Catalunya, 2021-07-08)
Bachelor thesis
Open AccessAmb el present treball final de grau s’ha pretès establir els fonaments de la turbulència i entendre com es forma aquest fenomen. Concretament, s’estudiarà el comportament dels fluxos turbulents confinats. Per això he fet ... -
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
