Publications related to An adjoint-based approach to the optimal control of separated flows

Model Order Reduction in Fluid Dynamics: Challenges and Perspectives

Alfio Quarteroni, Gianluigi Rozza, Andrea Manzoni, Toni Mikael Lassila

This chapter reviews techniques of model reduction of fluid dynamics systems. Fluid systems are known to be difficult to reduce efficiently due to several reasons. First of all, they exhibit strong nonlinearities - which are mainly related either to nonlin ...

Springer International Publishing2014

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

François Gallaire, Edouard Boujo

A variational technique is used to derive analytical expressions for the sensitivity of recirculation length to steady forcing in separated flows. Linear sensitivity analysis is applied to the two-dimensional steady flow past a circular cylinder for Reynol ...

Cambridge University Press2014

Open-loop control of a separated boundary layer

François Gallaire, Edouard Boujo

Linear optimal gains

G_{opt}(\omega)

are computed for the separated boundary-layer flow past a two-dimensional bump in the subcritical regime. Very large values are found, making it possible for small-amplitude noise to be strongly amplified and to desta ...

Elsevier France-Editions Scientifiques Medicales Elsevier2014

Linear response to harmonic forcing of the non-parallel Batchelor vortex

François Gallaire, Francesco Viola, Cristobal Manuel Arratia Martinez

The Batchelor vortex1 is a slowly developing asymptotic solution of the flow of a trailing line vortex. This flow has been comprehensively studied in its parallel approximation. In particular, the convective/absolute nature of the instability has been inve ...

2014

Shape Optimization of an Hydrofoil by Isogeometric Analysis

Matthieu Martin Jean-André Simeoni

We use Isogeometric Analysis as a framework for NURBS-based shape optimization of hydrofoils. We present geometrical representations by NURBS and some of their properties to design an hydrofoil. Then, we consider an irrotational flow around an hydrofoil an ...

2014

Head losses in junction manholes for free surface flows in circular conduits

Michael Pfister, Corrado Gisonni

Former studies on combining flows resulted in an efficient layout of sewer junctions operated under supercritical approach flow conditions. Straight extensions allowed a reduction in the shock wave heights generated by the merging flows, so that the global ...

Asce-Amer Soc Civil Engineers2014

Model order reduction in fluid dynamics: challenges and perspectives

Alfio Quarteroni, Gianluigi Rozza, Andrea Manzoni, Toni Mikael Lassila

This chapter reviews techniques of model reduction of fluid dynamics systems. Fluid systems are known to be difficult to reduce efficiently due to several reasons. First of all, they exhibit strong nonlinearities – which are mainly related either to nonlin ...

Springer2013

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

Vegetation establishment in convectively accelerated streams

Paolo Perona, Benoît Crouzy, Peter Molnar

We study the conditions for vegetation establishment within river reaches with converging boundaries. Common to many such rivers worldwide is the existence of a limiting front (e.g., Figure 1a) beyond which all the riverbed vegetation is uprooted by floodi ...

2013

Open-loop control of a separated boundary layer

François Gallaire, Edouard Boujo

Linear optimal gains

G_opt(\omega)

are computed for the separated boundary-layer flow past a two-dimensional bump in the subcritical regime. Very large values are found, making it possible for small-amplitude noise to be strongly amplified and to destabi ...

Cépaduès Editions2013

An adjoint-based approach to the optimal control of separated flows

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Model Order Reduction in Fluid Dynamics: Challenges and Perspectives

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

Open-loop control of a separated boundary layer

Linear response to harmonic forcing of the non-parallel Batchelor vortex

Shape Optimization of an Hydrofoil by Isogeometric Analysis

Head losses in junction manholes for free surface flows in circular conduits

Model order reduction in fluid dynamics: challenges and perspectives

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

Vegetation establishment in convectively accelerated streams

Open-loop control of a separated boundary layer

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

Head losses in junction manholes for free surface flows in circular conduits

Linear response to harmonic forcing of the non-parallel Batchelor vortex

Open-loop control of a separated boundary layer

Model order reduction in fluid dynamics: challenges and perspectives

Model Order Reduction in Fluid Dynamics: Challenges and Perspectives

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

Shape Optimization of an Hydrofoil by Isogeometric Analysis

Vegetation establishment in convectively accelerated streams

Open-loop control of a separated boundary layer