Exploració per tema "Boundary layer"
Ara es mostren els items 1-20 de 49
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A numerical investigation of laminar flow over a backward facing inclined step
(2016-08)
Article
Accés obertThe aim of the present study is to analyze the two dimensional flow over a backward-facing-inclined step in laminar flow regime. The inspiration for the present work is derived from the fact that in automobile industry, ... -
A time-average filtering technique to improve the efficiency of two-layer wall models for large eddy simulation in complex geometries
(Elsevier, 2019-06-30)
Article
Accés obertTwo-Layer wall models have been recurrently studied since they represent a good physical model for Large Eddy Simulations with underresolved wall regions. Specifically, those based on the Reynolds Averaged Navier-Stokes ... -
Aerodynamic efficiency improvement on a NACA-8412 airfoil via active flow control implementation
(Multidisciplinary Digital Publishing Institute, 2022-04-23)
Article
Accés obertThe present paper introduces a parametric optimization of several Active Flow Control (AFC) parameters applied to a NACA-8412 airfoil at a single post-stall Angle of Attack (AoA) of 15° and Reynolds number Re = 68.5×103. ... -
An efficient Two-Layer wall model for accurate numerical simulations of aeronautical applications
(2019)
Text en actes de congrés
Accés obertTwo-Layer wall models have been widely studied since they allow wall modeled Large Eddy Simulationsof general non-equilibrium flows. However, they are plagued by two persistent problems, the "log-layermismatch" and the ... -
An intercomparison of mesoscale simulations during the Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) experimental field campaign
(2014)
Comunicació de congrés
Accés obertThe Convective (diurnal, CBL) and Stably stratified (nocturnal, SBL) Boundary Layers over land have been extensively observed and relatively successfully modeled. But the early morning transition, when the CBL emerges from ... -
Analysis of turbulent exchange and coherent structures in the stable atmospheric boundary layer based on tower observations
(2013-11)
Article
Accés obertUsing data collected at the Spanish low troposphere research centre CIBA (Centro de Investigación de la Baja Atmósfera) and at the Cabauw Experimental Site for Atmospheric Research (CESAR) in the Netherlands, we analysed ... -
Assessment of LES models for a fully developed windturbine array boundary layer
(Begell House, 2023)
Text en actes de congrés
Accés restringit per acord de confidencialitatDirect numerical simulations of the incompressible Navier-Stokes equations at high Reynolds numbers are not yet feasible, so dynamically less complex mathematical formulations such as Large Eddy Simulation (LES) have been ... -
Boundary layer analysis and heat transfer of a nanofluid
(2014-08)
Article
Accés obertA theoretical model for nanofluid flow, including Brownian motion and thermophoresis, is developed and analysed. Standard boundary layer theory is used to evaluate the heat transfer coefficient near a flat surface. The ... -
Boundary Layer Late Afternoon and Sunset Turbulence: the BLLAST 2011 experiment
(2012)
Text en actes de congrés
Accés obert -
Design and qualification of a supersonic wind tunnel for induced boundary layer transition research
(2015-03-01)
Article
Accés obertThis paper presents the design and the results of the qualification test campaign of a multiple Mach number supersonic wind tunnel designed for induced boundary layer transition. Its characteristics, function, and ... -
Developments in acoustics for studying wave-driven boundary layer flow and sediment dynamics over rippled sand-beds
(2018-08)
Article
Accés obertThe processes of sediment entrainment, transport, and deposition over bedforms are highly dynamic and temporally and spatially variable. Obtaining measurements to understand these processes has led to ongoing developments ... -
Direct numerical simulation of free convection over a heated plate
(2012-12-10)
Article
Accés obertDirect numerical simulations of free convection over a smooth, heated plate are used to investigate unbounded, unsteady turbulent convection. Four different boundary conditions are considered: free-slip or no-slip walls, ... -
Effect of the actuation on the boundary layer of an airfoil at moderate reynolds number
(Springer, 2020)
Text en actes de congrés
Accés restringit per política de l'editorialSynthetic (zero net mass flux) jets are an active flow control technique to manipulate the flow field in wall-bounded and free-shear flows. The fluid necessary to actuate on the boundary layer is intermittently injected ... -
Estudi de la capa límit de diferents rugositats
(Universitat Politècnica de Catalunya, 2019-07)
Treball Final de Grau
Accés obertAquest treball de fi de grau té la intenció de establir quina seria la millor superfície per un banyador de competició. Per tal d’aconseguir-ho es té l’objectiu de estudiar superfícies amb diferents rugositats uniformement ... -
Evaluation of the diurnal cycle in the atmospheric boundary layer over land as represented by a variety of single-column models: the second GABLS experiment
(2011-08)
Article
Accés restringit per política de l'editorial -
Ferrofluid thin films for aerofoil lift enhancement and delaying flow separation
(Cambridge University Press, 2020-08-18)
Article
Accés obertIn this work, consideration is given to a novel concept for aerofoil lift enhancement and delaying flow separation. Here, lift enhancement is attained by preventing the growth of the boundary layer through the elimination ... -
Fixed-density boundary conditions in overdamped Langevin simulations of diffusion in channels
(2018-07)
Article
Accés obertWe consider the numerical integration of Langevin equations for particles in a channel, in the presence of boundary conditions fixing the concentration values at the ends. This kind of boundary condition appears for instance ... -
Flow topology dynamics in a three-dimensional phase space for turbulent Rayleigh-Bénard convection
(2020-02-28)
Article
Accés obert -
Fluid dynamics and heat transfer in the wake of a sphere
(2019-04)
Article
Accés obertDirect numerical simulation and large-eddy simulation have been performed for a heated sphere at Reynolds numbers of $Re=1000$ and $Re=10^4$, respectively. The Prandtl number for both simulations has been $Pr=0.7$. ... -
Fluidic oscillators, feedback channel effect under compressible flow conditions
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-09-01)
Article
Accés obertFluidic oscillators are often used to modify the forces fluid generates on any given bluff body; they can also be used as flow, pressure or acoustic sensors, with each application requiring a particular oscillator ...