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Accueil > Pages personnelles > COSSU Carlo > Carlo Cossu

Carlo Cossu

JPEG
Directeur de recherche CNRS
IMFT, 1 allée du Pr. Camille Soula
31400 Toulouse France
carlo.cossu(at)imft.fr
+33 (0)5 3432 2934,

Professeur chargé de cours à l’École polytechnique

École polytechnique, Palaiseau, France

WEB page @ Polytechnique


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Research interests


« Modern » hydrodynamic stability
with applications to flow
control,aerodynamics,
astrophysics
and numerical stability.
Dynamics of large bubbles. Coherent
structures and structure of turbulent flows.<br
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Teaching<font
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  • 2000- : Introduction to hydrodynamic instabilities MEC631. <span style="font-style: italic;">Master in Fluid Mechanics, M2, École polytechnique.
  • 2009 : Constrained optimization. Summer school on flow control and optimization, <span style="font-style: italic;">Linné Flow Centre graduate school, KTH Stockholm
  • 2006-2010 : Aérodynamique & Hydrodynamique MEC594, stages d’option.<span style="font-style: italic;"> École polytechnique.
  • 2005- : Mécanique des milieux continus MEC431, petites classes. <span style="font-style: italic;">École polytechnique.
  • 2002-2005 ; Hydrodynamic instabilities in open flows. 50% with Patrick Huerre. <span style="font-style: italic;">Master in Fluid Mechanics, M2, École polytechnique.
  • 2005- : Topics in Scientific Computing CS28501. 33% with R. Pierrehumbert. <span style="font-weight: bold;">Ordinary Differential Equations MATH27301. 33% with N. Lebovitz. Applied Numerical Analysis MATH211. 33% with R. Scott (2005). <span style="font-style: italic;">Undergraduate, Paris Applied & Computational Mathematics Winter Program. University of Chicago.
  • 2005-2008 : Projets en Mécanique des fluides MEC581, sujets & encadrement de projets. École polytechnique.


<span
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style="color: rgb(0, 0, 0);" color="#003399">Publications

  • M. Lombardi, C. Cossu, C.P. Caulfield, A.I. Pesci & R.E. Goldstein. Growth and instability of a laminar plume in a strongly stratified environment. Submitted to J. Fluid Mech.,  2010.
  • J. Park, Y. Hwang & C. Cossu. On the stability of large-scale streaks in turbulent Couette and Poiseulle flows. Submitted to Comptes-Rendus de l’Académie des Sciences, Mécanique, 2010.
  • A.P. Willis, Y. Hwang & C. Cossu. Optimally amplified large-scale streaks and drag reduction in the turbulent pipe flow. To appear in Phys. Rev. E, 2010
  • Y. Hwang & C. Cossu. On a self-sustained process al large scale in the turbulent channel flow. <span style="font-style: italic;">Phys. Rev. Lett. <span style="font-weight: bold;">105:044505 2010
  • Y. Hwang & C. Cossu. Linear non-normal energy amplification of harmonic and stochastic forcing in the turbulent channel flow. To appear in J. Fluid Mech. 2010.
  • G. Pujals, S. Depardon & C. Cossu. Drag reduction of a 3D bluff body using coherent streamwise streaks. To appear in <span style="font-style: italic;">Exp. Fluids, 2010.
  •  G. Pujals, C. Cossu & S. Depardon. Forcing large-scale coherent streaks in a zero pressure gradient turbulent boundary layer. <span style="font-style: italic;">J. Turbulence, <span style="font-weight: bold;">11(25):1-13<span style="font-style: italic;"> 2010<span style="font-style: italic;">.
  • Y. Hwang & C. Cossu. Amplification of coherent streaks in the turbulent Couette flow : an input-output analysis at low Reynolds number. J. Fluid Mech. <span style="font-weight: bold;">643:333-348, 2010.
  • M. Hollands & C. Cossu. Adding streaks in the plane Poiseuille flow. Comptes-Rendus de l’Académie des Sciences, Mécanique <span style="font-weight: bold;">337:179-183, 2009.
  • G. Pujals, M. Garcia-Villalba, C. Cossu & S. Depardon. A note on optimal transient growth in turbulent channel flows. <span style="font-style: italic;">Phys. Fluids <span style="font-weight: bold;">21:015109, 2009.
  • C. Cossu, G. Pujals & S. Depardon. Optimal transient growth and very large scale structures in turbulent boundary layers. <span style="font-style: italic;">J. Fluid Mech. <span style="font-weight: bold;">619:79-94, 2009.
  • J.R. Landel, C. Cossu & C.P. Caulfield. Fast rising cap bubbles with a toroidal bubbly wake. Phys. Fluids 20:122101, 2008. Paper in the Physics of Fluids top 20 (Dec 2008, Jan 2009).
  • F. Rincon, G. I. Ogilvie, M.R.E. Proctor & C. Cossu. Subcritical dynamos in shear flows. Astron. Nashr. 329:750, 2008.
  • C. Cossu, M. P. Chevalier & D. S. Henningson. Optimal secondary energy growth in a plane channel flow. <span style="font-style: italic;">Physics of Fluids. <span style="font-weight: bold;">19:05817, 2007.
  • F. Rincon, G. I. Ogilvie & C. Cossu. On self-sustaining processes in Rayleigh-stable rotating plane Couette flows and subcritical transition to turbulence in accretion disks. <span style="font-style: italic;">Astronomy & Astrophysics <span style="font-weight: bold;">463:817-832, 2007.
  • J.H.M. Fransson, A. Talamelli, L. Brandt & C. Cossu. Delaying transition to turbulence by a passive mechanism. <span style="font-style: italic;">Physical Review Letters <span style="font-weight: bold;">96 :064501, 2006.
  • E. Lauga & C. Cossu. A note on the stability of slip channel flows. Physics of Fluids 17 :088106, 2005.
  • J.H.M. Fransson, L. Brandt, A. Talamelli & C. Cossu. Experimental study of the stabilisation of Tollmien-Schlichting waves by finite amplitude streaks Physics of Fluids 17 :054110, 2005.
  • C. Cossu. An optimality condition on the minimum energy threshold in subcritical instabilities. <span style="font-style: italic;">Comptes-Rendus de l’Académie des Sciences, Mécanique. 333:331-336, 2005.
  • C. Cossu & L. Brandt. On Tollmien-Schlichting-like waves in streaky boundary layers. European Journal of Mechanics B/Fluids 23:815-833, 2004.
  • J.H.M. Fransson, L. Brandt, A. Talamelli & C. Cossu. Experimental and theoretical investigation of the non-modal growth of steady streaks in a flat plate boundary layer. <span style="font-style: italic;">Physics of Fluids <span style="font-weight: bold;">16 (10):3627-3638, 2004.
  • L. Brandt & C. Cossu & J.-M Chomaz & P. Huerre & D.S. Henningson. On the convectively unstable nature of optimal streaks in boundary layers. Journal of Fluid Mechanics, 485:221-242, 2003.
  • C. Cossu & L. Brandt. Stabilization of Tollmien-Schlichting waves by finite amplitude optimal streaks in the Blasius boundary layer. Physics of Fluids 14:L57-L60, 2002.
  • C. Cossu & L. Morino On the instability of a spring-mounted circular cylinder in a viscous flow at low Reynolds numbers. Journal of Fluids and Structures 14:183-196, 2000.
  • D. Fabre, C. Cossu & L. Jacquin. Spatio-temporal development of the long and short-wave vortex pair instabilities. <span style="font-style: italic;">Physics of Fluids <span style="font-weight: bold;">12 :1247-1250, 2000.
  • D. Sipp, L. Jacquin & C. Cossu Self-adaptation and viscous selection of concentrated 2D vortex dipoles. <span style="font-style: italic;">Physics of Fluids <span style="font-weight: bold;">12:245-248, 2000.
  • C. Cossu, J.-M. Chomaz, P. Huerre & M. Costa. Maximum spatial growth of Görtler vortices. <span style="font-style: italic;">Flows, Turbulence and Combustion, <span style="font-weight: bold;">65:369 392, 2000.
  • C. Cossu & T. Loiseleux. On the convective and absolute nature of instabilities in finite difference numerical simulations of open flows. Journal of Computational Physics 144:98-108, 1998.
  • C. Cossu & J. M. Chomaz. Global measures of local convective instabilities Physical Review Letters 78(23):4387-90, 1997.
  • C. Cossu & L. Morino. A vorticity-only formulation and a low-order asymptotic expansion near Hopf bifurcation. <span style="font-style: italic;">Computational Mechanics <span style="font-weight: bold;">20:229-241, 1997.