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Flow in shallow rectangular basins: experimental study and 2D numerical simulations

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Large-eddy simulation of plant canopy flows using plant-scale representation

Marc Parlange, Charles Vivant Ignacio Meneveau

Turbulent flow in a corn canopy is simulated using large-eddy simulation (LES) with a Lagrangian dynamic Smagorinsky model. A new numerical representation of plant canopies is presented that resolves approximately the local structure of plants and takes in ...

2007

Pump-Turbine Rotor-Stator Interactions in Generating Mode: Pressure Fluctuation in Distributor Channel

François Avellan, Mohamed Farhat, Amirreza Zobeiri

Investigation of the rotor-stator interactions of a reduced-scale model 0.19 ν= pump-turbine in generating mode is presented for the maximum discharge operating condition. This operating point is chosen in order to have the most important rotor-stator inte ...

International Association For Hydraulic Research2006

Viscoplastic flows

Actually little is known on the physical processes involved in avalanches or debris flows. We tackle this difficult issue by carrying out idealized experiments, where we focus on the motion of highly time-dependent flows of non-Newtonian fluids. The object ...

AGU2006

Inviscid Vortex Breakdown in Decelerated Swirling Flows and Flow Control Methods

François Avellan, Vlad Hasmatuchi

The paper is focused on decelerated swirling flow behavior as the upstream swirl intensity is increased. We define simplified flow model and boundary conditions in order to analyze the basic flow features. Numerical experiments are carried out for incompre ...

2006

Flow in a Pelton Turbine Bucket: Numerical and Experimental Investigations

François Avellan, Mohamed Farhat, Alexandre Perrig

The aim of the paper is to present the results of investigations conducted on the free surface flow in a Pelton turbine model bucket. Unsteady numerical simulations, based on the two-phase homogeneous model, are performed together with wall pressure measur ...

2006

To investigate the suitability of 144Ce for both interstitial and intravascular brachytherapy applications. Monte Carlo calculations of radial dose rate distributions in water were performed for 144Ce in a spring-shaped source and compared with two commonl ...

Elsevier2005

Analysis and numerical simulation of free surface flows

Alexandre Caboussat

Mathematical and numerical aspects of free surface flows are investigated. On one hand, the mathematical analysis of some free surface flows is considered. A model problem in one space dimension is first investigated. The Burgers equation with diffusion ha ...

EPFL2004

In order to better understand the sources of numerical instabilities occurring in the simulation of time-dependent flows of viscoelastic fluids at high Weissenberg numbers, we have used various types of linear stability analyses. In complement to the limit ...

2003

Numerical treatment of defective boundary conditions for the Navier-Stokes equations

Alfio Quarteroni, Fabio Nobile, Luca Formaggia

We present a formulation for accommodating defective boundary conditions for the incompressible Navier--Stokes equations where only averaged values are prescribed on measurable portions of the boundary. In particular we consider the case where the flow rat ...

Society for Industrial and Applied Mathematics2002

Application of k-epsilon turbulence models to enclosed basins: The role of internal seiches

Alfred Johny Wüest

[1] A numerical model was developed for the prediction of the density stratification of lakes and reservoirs. It combines a buoyancy-extended k-epsilon model with a seiche excitation and damping model to predict the diffusivity below the surface mixed laye ...

Amer Geophysical Union2002