Exploració per tema "Capa límit (Dinàmica de fluids)"
Ara es mostren els items 1-20 de 24
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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 Sommerfeld non-reflecting boundary condition for the wave equation in mixed form
(2014-07-01)
Article
Accés restringit per política de l'editorialIn this paper we develop numerical approximations of the wave equation in mixed form supplemented with non-reflecting boundary conditions (NRBCs) of Sommerfeld-type on artificial boundaries for truncated domains. We consider ... -
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 ... -
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 ... -
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 ... -
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 ... -
Evaporative cooling amplification of the entrainment velocity in radiatively driven stratocumulus
(2015-09-15)
Article
Accés obertEvaporative cooling monotonically increases as the thermodynamical properties of the inversion allow for more evaporation in shear-free radiatively driven stratocumulus. However, the entrainment velocity can deviate from ... -
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 ... -
Growth and decay of a convective boundary layer over a surface with a constant temperature
(2016-05-05)
Article
Accés obertThe growth and decay of a convective boundary layer (CBL) over a surface with a constant surface temperature that develops into a linear stratification is studied, and a mathematical model for this system is derived. The ... -
Near-surface effects of free atmosphere stratification in free convection
(2016-04-01)
Article
Accés obertThe effect of a linear stratification in the free atmosphere on near-surface properties in a free convective boundary layer (CBL) is investigated by means of direct numerical simulation. We consider two regimes: a neutral ... -
Nonsingular Zero-Order Bulk Models of Sheared Convective Boundary Layers
(2019-12-01)
Article
Accés obertTwo zero-order bulk models (ZOMs) are developed for the velocity, buoyancy, and moisture of a cloud-free barotropic convective boundary layer (CBL) that grows into a linearly stratified atmosphere. The models differ in ... -
Numerical study of a Boundary Layer Ingesting Propulsion system
(Universitat Politècnica de Catalunya, 2012)
Treball Final de Grau
Accés restringit per decisió de l'autorFor several years, Airbus has been working with the ONERA in a project called RAPRO aiming to study the in uence that a boundary layer created by an axisymmetric body placed upstream has in the global performances of an ... -
On the formation of Taylor-Görtler structures in the vortex induced vibration phenomenon
(2020-06-01)
Article
Accés obertIn this work, the three-dimensional structure of the boundary layer in the context of the vortex induced vibration of a circular cylinder is presented and investigated for the first time. Large-eddy simulations of a low ... -
On the role of large-scale updrafts and downdrafts in deviations from Monin-Obukhov similarity theory in free convection
(2019-05-29)
Article
Accés obertWe investigate by means of direct numerical simulation how large-scale circulations produce deviations from Monin–Obukhov similarity theory (MOST) in the limit of free convection, disentangling the role of large-scale ... -
Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer
(2014-11-01)
Article
Accés obertThe heterogeneously heated free convective boundary layer (CBL) is investigated by means of dimensional analysis and results from large-eddy simulations (LES) and direct numerical simulations (DNS). The investigated ... -
Study approach of the flow within a two-dimensional rocket nozzle based on the method of characteristics
(Universitat Politècnica de Catalunya, 2020-06)
Treball Final de Grau
Accés restringit per decisió de l'autor
Realitzat a/amb: SASTRA Deemed UniversityThe study focuses on the gas expansion through a two-dimensional, axisymmetric nozzle using the method of characteristics for the (assumed inviscid) bulk flow, and matching it to the viscous boundary layer. Nozzles are ...