Publications related to Assessment of RANS turbulence models in urban environments: CFD simulation of airflow around idealized high-rise morphologies.

Detached eddy simulation of flow around two wall-mounted cubes in tandem

We investigate the performance of unsteady Reynolds-averaged Navier-Stokes (URANS) computation and various versions of detached eddy simulation (DES) in resolving coherent structures in turbulent flow around two cubes mounted in tandem on a flat plate at R ...

Elsevier2009

Algebraic turbulence modeling in adiabatic gas–liquid annular two-phase flow

John Richard Thome, Andrea Cioncolini

The study considers algebraic turbulence modeling in adiabatic gas-liquid annular two-phase flow. After reviewing the existing literature, two new algebraic turbulence models are proposed for both the liquid film and the droplet laden gas core of annular t ...

Elsevier2009

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Ismail Albayrak

River and open-channel flows are free surface boundary layer flows with complex 3D, large-scale, turbulent structures. The study of 2D and 3D large-scale turbulent flow structures is a great challenge for physicists, mathematicians and engineers from such ...

EPFL2008

Microscale airflow simulations over complex alpine terrain

Françoise Faure

Accurate microscale windfields computations over complex topography is crucial to many particle transport models but remains a challenging task. The objective of this work focuses on the numerical simulations of micro-scale windfields over the steep Gauder ...

EPFL2008

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Albert Renken, Lioubov Kiwi, Anne-Laure Dessimoz

The flow of two immiscible fluids was investigated in rectangular glass microchannels with equivalent diameters of 269 and 400

\mu m

. Deionised water, dyed toluene and hexane were selected as probe fluids. Flow patterns were obtained for Y- and T-junction ...

2008

Subfilter-scale fluxes over a surface roughness transition. Part II: Evaluation of large-eddy simulation models

Fernando Porté Agel

The ability of subfilter-scale (SFS) models to reproduce the statistical properties of SFS stresses and energy transfers over heterogeneous surface roughness is key to improving the accuracy of large-eddy simulations of the atmospheric boundary layer. In t ...

2008

Turbulent kinetic energy budgets in a model canopy: comparisons between LES and wind-tunnel experiments

Marc Parlange, Charles Vivant Ignacio Meneveau

A comparative study of turbulence in a wind-tunnel model canopy is performed, using Large eddy simulation (LES) and experimental data from PIV and hot-wire anemom¬etry measurements. The model canopy is composed of thin cylindrical stalks. In the LES, these ...

2008

Simulation of shear-driven flows

Roland Bouffanais

The research work reported in the present dissertation is aimed at the analysis of complex physical phenomena involving instabilities and nonlinearities occurring in fluids through state-of-the-art numerical modeling. Solutions of intricate fluid physics p ...

EPFL2007

Large Eddy Simulation of the Turbulent Flow in a Tunnel with a Localized Heat Source

This paper presents Large Eddy Simulations of a compressible turbulent flow through a duct of square cross-section with a localized heat source on its bottom wall. The potential applications are related to the accidental heat release in a road tunnel. A co ...

2007

Existence and features of similarity solutions for non-Boussinesq gravity currents

Christophe Ancey, Steve Cochard, Martin Rentschler, Sébastien Wiederseiner

In this paper, the flow dynamics of gravity currents on a horizontal plane is investigated from a theoretical point of view by seeking similarity solutions. The current is generated by unleashing a varying volume of heavy fluid within an ambient fluid of m ...

2007

Assessment of RANS turbulence models in urban environments: CFD simulation of airflow around idealized high-rise morphologies.

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Detached eddy simulation of flow around two wall-mounted cubes in tandem

Algebraic turbulence modeling in adiabatic gas–liquid annular two-phase flow

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Microscale airflow simulations over complex alpine terrain

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Subfilter-scale fluxes over a surface roughness transition. Part II: Evaluation of large-eddy simulation models

Turbulent kinetic energy budgets in a model canopy: comparisons between LES and wind-tunnel experiments

Simulation of shear-driven flows

Large Eddy Simulation of the Turbulent Flow in a Tunnel with a Localized Heat Source

Existence and features of similarity solutions for non-Boussinesq gravity currents

Turbulent kinetic energy budgets in a model canopy: comparisons between LES and wind-tunnel experiments

Detached eddy simulation of flow around two wall-mounted cubes in tandem

Subfilter-scale fluxes over a surface roughness transition. Part II: Evaluation of large-eddy simulation models

Simulation of shear-driven flows

Existence and features of similarity solutions for non-Boussinesq gravity currents

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Algebraic turbulence modeling in adiabatic gas–liquid annular two-phase flow

Microscale airflow simulations over complex alpine terrain

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Large Eddy Simulation of the Turbulent Flow in a Tunnel with a Localized Heat Source