Publications related to Optimal spanwise-periodic control for recirculation length in a backward-facing step flow

Large-eddy simulation of very-large-scale motions in atmospheric boundary-layer flows

In the last few decades, laboratory experiments and direct numerical simulations of turbulent boundary layers, performed at low to moderate Reynolds numbers, have found very-large-scale motions (VLSMs) in the logarithmic and outer regions. The size of VLSM ...

2015

Turbulent-laminar patterns in plane Poiseuille flow

Tobias Schneider, Tobias Klaus Kreilos

Turbulent-laminar banded patterns in plane Poiseuille flow are studied via direct numerical simulations in a tilted and translating computational domain using a parallel version of the pseudospectral code Channelflow. 3D visualizations via the streamwise v ...

Amer Inst Physics2014

The vertical structure of eddy diffusivity in pure slope flows over smooth surfaces

Jiannong Fang, Marc Parlange, Marco Giovanni Giometto

Thermally driven slope flows are ubiquitous in nature and play a major role in regulating local microclimates in valleys, glaciers and ice-sheets. They control in large part surface momentum, heat and moisture fluxes, and their effects must therefore be ac ...

2014

Forced reattachment in separated flows: a variational approach to recirculation length reduction

François Gallaire, Edouard Boujo

Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region

l_c

is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...

2013

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

Fernando Porté Agel, Wai Chi Cheng

Large-eddy simulations of flow past a two-dimensional (2D) block were performed to evaluate four sub-grid-scale (SGS) models: (i) the traditional Smagorinsky model, (ii) the Lagrangian dynamic model, (iii) the Lagrangian scale-dependent dynamic model, and ...

Elsevier2013

Open-loop control of noise amplification in separated boundary layers

François Gallaire, Edouard Boujo

Linear optimal gains are computed for the subcritical two-dimensional separated boundary-layer flow past a bump. Very large optimal gain values are found, making it possible for small-amplitude noise to be strongly amplified and to destabilize the flow. Th ...

2013

Stability analysis and control of the flow in a symmetric channel with a sudden expansion

Andrea Fani

The laminar flow in two-dimensional diffusers may produce either symmetric or nonsymmetric steady solutions, depending on the value of the Reynolds number as compared with some critical value. The stability properties of the flow are studied in the context ...

American Institute of Physics2012

A second-order cut-cell method for the numerical simulation of 2D flows past obstacles

We present a new second-order method, based on the MAC scheme on cartesian grids, for the numerical simulation of two-dimensional incompressible flows past obstacles. In this approach, the solid boundary is embedded in the cartesian computational mesh. Dis ...

Pergamon-Elsevier Science Ltd2012

Large Eddy Simulation of Particle Dynamics Inside a Differentially Heated Cavity

Christoph Bosshard

In nuclear safety, most severe accident scenarios lead to the presence of fission products in aerosol form in the closed containment atmosphere. It is important to understand the particle depletion process to estimate the risk of a release of radioactivity ...

EPFL2012

A weakly nonlinear mechanism for mode selection in swirling jets

François Gallaire, Philippe Meliga

Global linear and nonlinear bifurcation analysis is used to revisit the spiral vortex breakdown of nominally axisymmetric swirling jets. For the parameters considered herein, stability analyses single out two unstable linear modes of azimuthal wavenumber m ...

Cambridge University Press2012

Optimal spanwise-periodic control for recirculation length in a backward-facing step flow

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Large-eddy simulation of very-large-scale motions in atmospheric boundary-layer flows

Turbulent-laminar patterns in plane Poiseuille flow

The vertical structure of eddy diffusivity in pure slope flows over smooth surfaces

Forced reattachment in separated flows: a variational approach to recirculation length reduction

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

Open-loop control of noise amplification in separated boundary layers

Stability analysis and control of the flow in a symmetric channel with a sudden expansion

A second-order cut-cell method for the numerical simulation of 2D flows past obstacles

Large Eddy Simulation of Particle Dynamics Inside a Differentially Heated Cavity

A weakly nonlinear mechanism for mode selection in swirling jets

Stability analysis and control of the flow in a symmetric channel with a sudden expansion

Large Eddy Simulation of Particle Dynamics Inside a Differentially Heated Cavity

Large-eddy simulation of very-large-scale motions in atmospheric boundary-layer flows

The vertical structure of eddy diffusivity in pure slope flows over smooth surfaces

A second-order cut-cell method for the numerical simulation of 2D flows past obstacles

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

A weakly nonlinear mechanism for mode selection in swirling jets

Turbulent-laminar patterns in plane Poiseuille flow

Forced reattachment in separated flows: a variational approach to recirculation length reduction

Open-loop control of noise amplification in separated boundary layers