LES
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Recent papers in LES
Abstract The paper presents a comparative analysis of recent simulations, conducted in the framework of a French-German collaboration on LES of Complex Flows, for the so-called Ahmed body at Reynolds number 768000 and slant angle 25. It... more
Het Grafisch Lyceum te Utrecht. wil graag dé topvakschool van Nederland worden en heeft breed ingezet om de kwaliteit van haar onderwijs en docenten te verbeteren. Guido Romeijn docent en onderzoeker aan de Mbo-opleiding Interactieve... more
Computational fluid dynamics (CFD) calculations of pump sumps are troublesome due to the nature of the flow. Pump sump flow is turbulent and unsteady, and pump sump dimensions are large compared to diameter of vortices occurring near the... more
Numerical prediction of an efficiency of a 6-blade Kaplan turbine is presented. At first, the results of steady state analysis performed by different turbulence models for different operating regimes are compared to the measurements. For... more
Large-eddy simulation (LES) is conducted to investigate the flow around a simplified ICE2 train under side wind conditions at 30 degrees yaw angle. The Reynolds number based on the height of the train and the free stream velocity is 2 x... more
A popular functional form for modeling the consumption block of a computable general equilibrium model (CGE) is the Linear Expenditure System (LES) for which the Engel curves are straight lines. The LES does not allow for the existence of... more
Recent case studies on the precursor signatures of equatorial spread-F (ESF) have shown a one-to-one correspondence between the large-scale wave structures (LSWS) and ESF development at equatorial latitude. In this study, the LSWS and the... more
We consider the effects of chordwise flexibility on the aerodynamic performance of flapping wings using numerical simulation. The two-dimensional Navier–Stokes equations are solved using a Fourier pseudo-spectral method with no-slip... more
This article is focused on the choice of a suitable turbulence model for simulations of an industrial pump's intake, from the perspective of accuracy and, partially, also the CPU time. Twelve steady-state and transient simulations were... more
We present a newly developed unstructured high order h/p Discontinuous Galerkin Finite Element solver for the computation of tidal turbine hydrodynamics. The solver allows for accurate flow solutions of the two dimensional incompressible... more
The present work develops a low cost numerical method for the solution of nonpremixed piloted methane jet flames. This method is based on the mixture fraction for fluid flow and on unsteady flamelet models, combined with the presumed... more
This paper investigates the unsteady, near wake of a circular cylinder in cross flow at a Reynolds number of 5.5 x 10(3) using Large Eddy Simulation (LES). The near and intermediate wake velocity fields and unsteady aerodynamic forces... more
This article is focused on the choice of a suitable turbulence model for simulations of an industrial pump's intake, from the perspective of accuracy and, partially, also the CPU time. Twelve steady-state and transient simulations... more
Resumen: Investigaciones sobre la cavitación tienen una gran importancia económica en el campo de la maquinaria hidráulica. Durante más de 40 años, métodos de mecánica computacional de fluidos han sido para entender estos fenómenos y... more
"This paper aims at making an assessment of the performance of the large eddy simulation (LES) method in simulating the complex vortical flow in a Francis hydraulic turbine. Firstly the principle of the LES method is presented. Then,... more
This thesis investigates the aerodynamic and aeroacoustic prediction of vertical axis wind turbines, using computational fluid dynamics simulations. Noise pollution from wind turbines is one of the disadvantages of wind energy, calling... more
The present- day Large Eddy Simulation models based on the Smagorinsky assumption and the drawbacks of the dynamic calcula-tion of the closure coefficient for the generalised subgrid scale turbulent stress tensor are presented. The... more
MVG (micro vortex generator) is a potentially new device which can alleviate or overcome the adverse effects of SBLI (Shockboundary layer interaction) and improve the “health” of the boundary layer. In this paper, the SBLI in a ramp flow... more
Page 1. Quels découpages territoriaux pour la gestion de l'environnement ? Thierry Joliveau et Olivier Barge CRENAM/CNRS UMR 5600. Entretiens Jacques Cartier : décembre 1997. Lyon : les découpages du territoire Page 2.... more
Abstract The paper presents a comparative analysis of recent simulations, conducted in the framework of a French-German collaboration on LES of Complex Flows, for the so-called Ahmed body at Reynolds number 768000 and slant angle 25. It... more
"One of the unresolved problems is the unsteady inlet boundary condition in current Computational Fluid Dynamics (CFD) simulations or Computational Wind Engineering (CWE). It is known that the inlet boundary condition of the current CFD... more
In this paper we present the modelled results of turbulence, scalar mixing and intermittency for three different basic fluid dynamical problems using large eddy simulation (LES). The modelled problems are a turbulent round jet, a bluff... more