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Directeur de recherche CNRS

Thèmes de recherche :
Stabilité hydrodynamique « moderne » avec application
au contrôle d’écoulements, aérodynamique, astrophysique et
aux analyses de stabilité numérique.
Structures cohérentes dans les écoulements turbulents
Dynamique des grandes bulles.


  • 2012-2016 : Instabilities and Turbulence MEC555. École polytechnique.
  • 2000-2011 : Introduction to hydrodynamic instabilities MEC631. Master in Fluid Mechanics, M2, École polytechnique.
  • 2009 : Constrained optimization. Summer school on flow control and optimization, Linné Flow Centre graduate school, KTH Stockholm
  • 2006-2010 : Aérodynamique & Hydrodynamique MEC594, stages d’option. École polytechnique.
  • 2005-2011 : Mécanique des milieux continus MEC431, petites classes. École polytechnique.
  • 2002-2005 ; Hydrodynamic instabilities in open flows. 50% with Patrick Huerre. Master in Fluid Mechanics, M2, École polytechnique.
  • 2005- : Topics in Scientific Computing CS28501. 33% with R. Pierrehumbert. Ordinary Differential Equations MATH27301. 33% with N. Lebovitz. Applied Numerical Analysis MATH211. 33% with R. Scott (2005). Undergraduate, Paris Applied & Computational Mathematics Winter Program. University of Chicago.
  • 2005-2008 : Projets en Mécanique des fluides MEC581, sujets & encadrement de projets. École polytechnique.

  • Publications

    • C. Cossu & Y. Hwang. Self-sustaining processes at all scales in wall-bounded turbulent shear flows. Phil. Trans. R. Soc. A. 375:20160088, 2017.
    • A. Riols, F. Rincon, C. Cossu, G. Lesur, G. I. Ogilvie & P.-Y. Longaretti. Magnetorotational dynamo chimeras.Astronomy & Astrophysics 598 :A87.1-A87.12, 2017.
    • M. Marant, C. Cossu & G. Pujals. Optimal streaks in the wake of a blunt-based axisymmetric bluff body and their influence on vortex shedding. C. R. Mécanique. 345:378-385, 2017.
    • Y. Hwang, A.P. Willis & C. Cossu. Invariant solutions of minimal large-scale structures in turbulent channel flow for Re_\tau up to 1000. J. Fluid Mech., 802:R1.1-R1.13, 2016.
    • S. Rawat, C. Cossu & F. Rincon. Travelling-wave solutions bifurcating from relative periodic orbits in plane Poiseuille flow. C. R. Mécanique, 344:448-455, 2016.
    • S. Rawat, C. Cossu, Y. Hwang & F. Rincon. On the self-sustained nature of large-scale motions in turbulent Couette flow. J. Fluid Mech., 782:515-540, 2015.
    • A. Riols, F. Rincon, C. Cossu, G. Lesur, G. I. Ogilvie & P.-Y. Longaretti. Dissipative effects on the sustainment of a magnetorotational dynamo in Keplerian shear flow. Astronomy & Astrophysics., 575, A14.1-A14.7, 2015.
    • G. Del Guercio, C. Cossu & G. Pujals. Optimal streaks in the circular cylinder wake and suppression of the global instability. J. Fluid Mech., 752:572-588, 2014.
    • C. Cossu. On the stabilizing mechanism of 2D absolute and global instabilities by 3D streaks. ArXiv Fluid Dynamics, 1404.3191, April 2014.
    • G. Del Guercio, C. Cossu & G. Pujals. Optimal perturbations of non-parallel wakes and their stabilizing effect on the global instability. Phys. Fluids, 26:024110, 2014.
    • C. Cossu. An introduction to optimal control. Appl. Mech. Rev., 66:021001, 2014.
    • G. Del Guercio, C. Cossu & G. Pujals. Stabilizing effect of optimally amplified streaks in parallel wakes. J. Fluid Mech., 739:37, 2014.
    • S. Rawat, C. Cossu & F. Rincon. Relative periodic orbits in plane Poiseuille flow. C. R. Mécanique, 342:485-489, 2014.
    • A. Riols, F. Rincon, C. Cossu, G. Lesur, G. I. Ogilvie, P.-Y. Longaretti & J. Herault. Global bifurcations to subcritical magnetorotational dynamo action in Keplerian shear flow. J. Fluid Mech., 731:1, 2013.
    • J. Herault, F. Rincon, C. Cossu, G. Lesur, G. I. Ogilvie & P.-Y. Longaretti. Periodic magnetorotational dynamo action as a prototype of nonlinear magnetic field generation in shear flows. Phys. Rev. E84:036321, 2011.
    • C. Cossu, L. Brandt, S. Bagheri & D.S. Henningson. Secondary threshold amplitudes for sinuous streak breakdown. Phys. Fluids, 23:074173, 2011.
    • Y. Hwang & C. Cossu. Self-sustained processes in the logarithmic layer of turbulent channel flows. Letter to Phys. Fluids, 23:061702, 2011.
    • M. Lombardi, C.P. Caulfield, C. Cossu, A.I. Pesci & R.E. Goldstein. Growth and instability of a laminar plume in a strongly stratified environment. J. Fluid Mech. 671:184-206, 2011.
    • G. Pujals, S. Depardon & C. Cossu.Transient growth of coherent streaks for control of turbulent flow separation. Intl. J. Aerodyn. 1(3-4):318-336, 2011.
    • J. Park, Y. Hwang & C. Cossu. On the stability of large-scale streaks in turbulent Couette and Poiseulle flows. C. R. Mécanique, 339:1-5, 2011.
    • A.P. Willis, Y. Hwang & C. Cossu. Optimally amplified large-scale streaks and drag reduction in the turbulent pipe flow. <span style="font-style: italic;">Phys. Rev. E, 82:036321 2010
    • Y. Hwang & C. Cossu. On a self-sustained process al large scale in the turbulent channel flow. Phys. Rev. Lett. 105:044505 2010
    • Y. Hwang & C. Cossu. Linear non-normal energy amplification of harmonic and stochastic forcing in the turbulent channel flow. J. Fluid Mech. 664:51-73, 2010.
    • G. Pujals, S. Depardon & C. Cossu. Drag reduction of a 3D bluff body using coherent streamwise streaks. Exp. Fluids, 49(5):1085-1094 2010.
    •  G. Pujals, C. Cossu & S. Depardon. Forcing large-scale coherent streaks in a zero pressure gradient turbulent boundary layer. J. Turbulence, <span style="font-weight: bold;">11(25):1-13 2010.
    • Y. Hwang & C. Cossu. Amplification of coherent streaks in the turbulent Couette flow : an input-output analysis at low Reynolds number. J. Fluid Mech. 643:333-348, 2010.
    • M. Hollands & C. Cossu. Adding streaks in the plane Poiseuille flow. C.R. Mécanique 337:179-183, 2009.
    • G. Pujals, M. Garcia-Villalba, C. Cossu & S. Depardon. A note on optimal transient growth in turbulent channel flows. Phys. Fluids 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. 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. Physics of Fluids. 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. Astronomy & Astrophysics 463:817-832, 2007.
    • J.H.M. Fransson, A. Talamelli, L. Brandt & C. Cossu. Delaying transition to turbulence by a passive mechanism. Physical Review Letters 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. C.R. 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. Physics of Fluids 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 12 :1247-1250, 2000.
    • D. Sipp, L. Jacquin & C. Cossu Self-adaptation and viscous selection of concentrated 2D vortex dipoles. Physics of Fluids 12:245-248, 2000.
    • C. Cossu, J.-M. Chomaz, P. Huerre & M. Costa. Maximum spatial growth of Görtler vortices. Flows, Turbulence and Combustion, 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. Computational Mechanics 20:229-241, 1997.