Exploració per tema "Turbulence"
Ara es mostren els items 1-20 de 214
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123-321 models of classical novae
(EDP Sciences, 2020-01-28)
Article
Accés obert
Realitzat a/amb: 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)
Report de recerca
Accés obert -
A conservative overlap method for multi-block parallelization of compact finite-volume schemes
(Elsevier, 2017-12)
Article
Accés obertA 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 data-driven wall-shear stress model for LES using gradient boosted decision trees
(Springer Nature, 2021)
Text en actes de congrés
Accés obertWith the recent advances in machine learning, data-driven strategies could augment wall modeling in large eddy simulation (LES). In this work, a wall model based on gradient boosted decision trees is presented. The model ... -
A framework for estimating epistemic uncertainty in LES closures
(2016)
Report de recerca
Accés obert -
A measure of flow vorticity with twisted beams of light
(Curran, 2016)
Text en actes de congrés
Accés restringit per política de l'editorialThe 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
Accés obertDirect 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
Accés obertWe 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
Accés obertAt 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
Accés obertIn 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)
Report de recerca
Accés obert -
A simple approach to discretize the viscous term with spatially varying (eddy-)viscosity
(2013-11-15)
Article
Accés restringit per política de l'editorialA 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
Accés obertLas 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 techniques for grau area mitigation in DES simulations and their effectes on the subsonic round jet acoustic spectra
(2021)
Text en actes de congrés
Accés restringit per política de l'editorialThe 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)
Llibre
Accés restringit per política de l'editorialThis 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)
Treball Final de Grau
Accés obertHeat 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
Accés obertEn 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
Accés restringit per política de l'editorialSedimentation 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 the Near-Wall Flow in a Turbine Cascade by Splat Visualization
(2020-01)
Article
Accés obertTurbines 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 ... -
Analysis of turbulence in fog episodes
(Copernicus Publications, 2008-04-24)
Article / Text en actes de congrés
Accés obertMany 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 ...
