Exploració per tema "Eddies"
Ara es mostren els items 21-38 de 38
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Near-Wall Flow in Turbomachinery Cascades—Results of a German Collaborative Project
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-08)
Article
Accés obertThis article provides a summarizing account of the results obtained in the current collabora-tive work of four research institutes concerning near-wall flow in turbomachinery. Specific questions regarding the influences ... -
New Strategies for Mitigating the Gray Area in Delayed-Detached Eddy Simulation Models
(2021-09)
Article
Accés obertThis paper presents a new approach for mitigating the unphysical delay in the Reynolds-averaged Navier–Stokes (RANS) to large-eddy simulation (LES) transition, often referred to as the gray area, which is a common issue ... -
Non-dissipative large-eddy simulation of high-pressure transcritical turbulent flows: formulation and a priori analysis
(European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
Text en actes de congrés
Accés obertThis work presents a filtered set of equations suitable for the large-eddy simulation of high-pressure transcritical turbulent flows. The formulation is derived from a novel kinetic-energy- and pressureequilibrium- preserving ... -
Numerical analysis of parcel tracking in large eddy simulation of polydispersed multiphase flows: assessment of different parcel modeling techniques
(2023)
Text en actes de congrés
Accés restringit per política de l'editorialIn order to assess the impacts of parcel modeling, the Eulerian-Lagrangian method, by using the Particle-In-Cell model, is implemented for a three-dimensional polydispersed two-phase turbulent flow. First, the benchmark ... -
Numerical assessment of parcel modeling in large eddy simulation for dispersed multiphase flows
(2023)
Text en actes de congrés
Accés obertThe particle-laden turbulent flow benchmark case of a confined jet by Hishida (1987) was selected for validation purposes of the Eulerian-Lagrangian method in Large Eddy Simulation (LES). After validation, a particle size ... -
On a Proper Tensor-Diffusivity Model for Large-Eddy Simulation of Buoyancy-Driven Turbulence
(Springer, 2020-03-26)
Article
Accés obertIn this work, we aim to shed light to the following research question: can we find a nonlinear tensorial subgrid-scale (SGS) heat flux model with good physical and numerical properties, such that we can obtain satisfactory ... -
On a proper tensor-diffusivity model for large-eddy simulations of buoyancy driven flows
(2019)
Text en actes de congrés
Accés restringit per política de l'editorial -
On a Proper Tensorial Subgrid Heat Flux Model
(2021)
Text en actes de congrés
Accés obertIn this work, we aim to shed light to the following research question: can we find a nonlinear tensorial subgrid-scale (SGS) heat flux model with good physical and numerical properties, such that we can obtain satisfactory ... -
On the Characteristics of the Super-Critical Wake behind a Circular Cylinder
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-11-03)
Article
Accés obertThe flow topology of the wake behind a circular cylinder at the super-critical Reynolds number of Re=7.2×105 is investigated by means of large eddy simulations. In spite of the many research works on circular cylinders, ... -
On the effect of prandtl number to subgrid-scale heat flux models
(Scipedia, 2022)
Text en actes de congrés
Accés obertEstimations of the grid size and computational cost for direct numerical simulation (DNS) and large-eddy simulation (LES) of Rayleigh-Bénard convection (RBC) are presented in the {Ra, P r} phase space. Computational ... -
On the evolution of flow topology in turbulent Rayleigh-Bénard convection
(2016-11-22)
Article
Accés obertSmall-scale dynamics is the spirit of turbulence physics. It implicates many attributes of flow topology evolution, coherent structures, hairpin vorticity dynamics, and mechanism of the kinetic energy cascade. In this work, ... -
On the large-eddy simulation of a fully developed wind-turbine array boundary layer
(European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
Comunicació de congrés
Accés obertDirect 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 ... -
Study: Numerical simulations of synthetic jets
(Universitat Politècnica de Catalunya, 2020-06)
Treball Final de Grau
Accés obertA synthetic jet is formed by the oscillating movement of a membrane located inside a cavity. Such movement allows ambient fluid to be dragged inside and outside, hence producing a jet that is able to transfer both linear ... -
Symmetry-preserving discretizations applied to Large-Eddy Simulation techniques in Navier-Stokes equations
(Universitat Politècnica de Catalunya, 2020-09-28)
Treball Final de Grau
Accés obertDirect Numerical Simulations of the incompressible Navier-Stokes equations for relatively high Reynolds numbers, as required for airfoils, are extremely expensive in terms of number of CPUs as well as processing time. Thus, ... -
Taming Winfree turbulence of scroll waves in excitable media
(2003-03-14)
Article
Accés obertWinfree turbulence of scroll waves is a special kind of spatiotemporal chaos that exists exclusively in three-dimensional excitable media and is currently considered one of the principal mechanisms of cardiac fibrillation. ... -
The biogeochemical structure of Southern Ocean mesoscale eddies
(Wiley, 2020-08)
Article
Accés obertMesoscale eddies play a key role in modulating physical and biogeochemical properties across the global ocean. They also play a central role in cross‐frontal transport of heat, freshwater, and carbon, especially in the ... -
The entrainment process between the Monsoon flow and the Saharan Air Layer in the West African Monsoon system
(2010)
Comunicació de congrés
Accés obert -
Unsteady forces on a circular cylinder at critical Reynolds numbers
(2014-12-23)
Article
Accés obertIt is well known that the flow past a circular cylinder at critical Reynolds number combines flow separation, turbulence transition, reattachment of the flow, and further turbulent separation of the boundary layer. The ...
