Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Global modes in a confined impinging jet: Application to heat transfer and control

Philippe Meliga 1, 2, * Jean-Marc Chomaz 1, * 
Abstract : We investigate the stability and control of a plane, laminar jet impinging on a flat plate in a channel, a geometry used to cool down a hot wall with a cold air jet in many industrial configurations. The global stability analysis indicates that, even for a strong confinement, the two-dimensional (2-D) steady flow is unstable to three-dimensional (3-D), steady perturbations. In the simplest limit case where dilatation effects are neglected, we show that the development of the instability induces a significant spanwise modulation of the heat flux at the impacted wall. To control the leading global mode, we propose adjoint-based 3-D harmonic and 2-D steady forcing in the bulk or at the wall. We show for instance that the unstable mode is controllable using a spanwise uniform blowing at the upper wall, in a specific domain corresponding to the footprint of the upper recirculating bubble. These techniques are applied to a novel open-loop control, in which we introduce into the flow a small airfoil, modelled by the lift force it exerts on the flow. © 2010 Springer-Verlag.
Complete list of metadata
Contributor : Denis Roura Connect in order to contact the contributor
Submitted on : Wednesday, June 4, 2014 - 10:29:37 AM
Last modification on : Thursday, March 5, 2020 - 6:28:51 PM

Links full text




Philippe Meliga, Jean-Marc Chomaz. Global modes in a confined impinging jet: Application to heat transfer and control. Theoretical and Computational Fluid Dynamics, Springer Verlag, 2011, 25 (1-4), pp.179-193. ⟨10.1007/s00162-010-0194-6⟩. ⟨hal-00997978⟩



Record views