velocity noiseDr Yannick Ponty

 Directeur de recherche CNRS

office : PHCS-15
adress : Laboratory Lagrange CNRS/UMR 7293
Observatoire de la Côte d'Azur
CS 34229 06304 NICE Cedex 4 France
Université Côte d'Azur (UCA)

  phone :  +33 (0)4 92 00 30 57
  fax :  +33 (0)4 92 00 31 21
  email :

 cv : pdfcv-Y.Ponty.pdf

Free time Activities

MagnetoHydroDynamic (MHD), Dynamo Effect, Fluid Instability,

High Performance Computing (HPC)



                                                                      10.1103/PhysRevLett.129.024502  Editor Suggestion  [PDF]

route to sub branche

dynamo seed tg 

(update 05/07/2022)

[27] A systematic route to subcritical dynamo branches
Paul M. Mannix, Yannick Ponty, and Florence Marcotte,
Phys. Rev. Lett. 129, 024502 - 2022
10.1103/PhysRevLett.129.024502  Editor Suggestion  [PDF]

[26] Dynamo Enhancement and Mode Selection Triggered by High Magnetic Permeability
S. Kreuzahler, Y. Ponty, N. Plihon, H. Homann, and R. Grauer
Phys. Rev. Lett. 119, 234501 – Published 6 December 2017   [PDF]
[25]  J. D. Gibbon, A. Gupta, G. Krstulovic, R. Pandit, H. Politano, Y. Ponty, A. Pouquet, G. Sahoo, and J. Stawarz
"Depletion of nonlinearity in magnetohydrodynamic turbulence: Insights from analysis and simulations"
Phys. Rev. E 93, 043104 (2016) [PDF]
doi : 10.1103/PhysRevE.93.043104

[24]  Sebastian Kreuzahler, Daniel Schulz, Holger Homann, Yannick Ponty, Rainer Grauer
   "Numerical study of impeller-driven von Karman flows via a volume penalization method"
     New J. Phys. 16 103001 (2014) [PDF]

[23] Holger Homann, Yannick Ponty, Giorgio Krstulovic, Rainer Grauer
       "Structures and Lagrangian statistics of the Taylor-Green Dynamo"
        New J. Phys. 16 075014 (2014)  [PDF] 

[22] Y. Ponty and F. Plunian
       "Transition from Large-Scale to Small-Scale Dynamo"
        Phys. Rev. Lett.  106, 154502 (2011). [PDF]

[21] A. D. Gilbert, Y. Ponty, V. Zheligovsky
       ``Dissipative structures in a nonlinear dynamo''
          Geoph. Astroph. Fluid. Dyn. 1-25 (2010). [PDF]

[20] J. Baerenzung, P.D. Mininni, A. Pouquet, H. Politano, and Y. Ponty
       "Spectral Modeling of Rotating Turbulent Flows"      
         Physics of Fluids, 22, p. 025104 (2010) . [PDF]

[19] Y. Ponty, P. D. Mininni , J-P. Laval, A. Alexakis, J. Baerenzung,
        F. Daviaud, B. Dubrulle, J-F. Pinton, H. Politano, A. Pouquet
       "Linear and non linear features of the Taylor-Green Dynamo"
       C. R. Physique  9  749–756 (2008) [PDF] .

[18]  J. Baerenzung, H. Politano, Y. Ponty, A. Pouquet
       "Spectral Modeling of Magnetohydrodynamic Turbulent Flows"
         Phys. Rev. E 78 026310 (2008)  [PDF]

[17] A. Alexakis and Y. Ponty
       "The Lorentz force effect on the On-Off dynamo intermittency"
        Phys. Rev. E 77, 056308 (2008)  [PDF]

[16] J. Baerenzung, H. Politano, Y. Ponty, A. Pouquet,
        "Spectral Modeling of Turbulent Flows and the Role of Helicity"
         Phys. Rev. E  77,  (2008) 04303  [PDF]

[15] Y. Ponty, J.-P. Laval, B. Dubrulle, F. Daviaud, and J.-F. Pinton
          «Subcritical Dynamo Bifurcation in the Taylor-Green Flow»
           Phys. Rev. Lett. 99, 224501 (2007) [PDF] 

  Cover page of PRL  November 2007  :  see this link 

[14] Y. Ponty , P. Minnini , J.-F. Pinton, H. Politano  and A. Pouquet
        "Dynamo action at low magnetic Prandtl numbers: mean flow versus fully turbulent motions"
       New Journal of Physics 9 , 296 (2007)  [PDF]

[13] A. Courvoisier,, A. G. Gilbert, & Y. Ponty,   "Dynamo action in flows with cat's eyes" 
        Geophysical and Astrophysical Fluid Dynamics, Vol. 99, No. 5, pp 413-­429 October (2005) [PDF]

[12]  P. D. Mininni, Y. Ponty, D. C. Montgomery, J-F Pinton, H. Politano, and A. Pouquet      
        "Dynamo Regimes with a Non-helical Forcing"  
         The Astrophysical Journal,  626: 853 ­-863  (2005) [PDF]

[11] Y. Ponty , P. Minnini , A. Pouquet , H. Politano , D. Montgomery , J.-F. Pinton
        "Numerical study of dynamo action at low magnetic Prandtl numbers"
         Phys. Rev. Lett.  94  164512  (2005) [PDF]

[10] Y. Ponty, J. F Pinton and H. Politano,
        " Simulation of induction at low magnetic Prandtl number" 
        Phys. Rev. Lett. Vol. 92 number 14 , pp 144503 -1 (2004) [PDF]
[9]  Y. Ponty, A.D. Gilbert and A.M. Soward
      "The onset of thermal convection in Ekman--Couette shear flow with oblique rotation" 
       J. Fluid Mech. 487  pp 91-123 (2003). [PDF]

[8]  Y. Ponty, A.D. Gilbert and A.M. Soward , 
      "Kinematic dynamo action in flows driven by shear and convection"
       J. Fluid Mech. 435  , 261-287  (2001). [PDF]

[7]  A.D. Gilbert, and Y. Ponty,
      ``Slow Ponomarenko dynamos on stream surfaces.''
       Geophys. Astrophys. Fluid Dyn 93,  55- 95 (2000). [PDF]

[6] D. Laveder, T. Passot, Y. Ponty and P.L. Sulem,
     ``Effect of a random noise on scaling laws of finite Prandtl number rotating convection near threshold''
   Phys. Rev. E  59   R4745-R4748 (1999). [PDF]

[5] Y. Ponty, T. Passot and P.L Sulem, ``Rotating convection at moderate Prandtl number''
      Physica A249, 146-150 (1998). [PDF]

[4] Y. Ponty, T. Passot and P. L. Sulem, .
     ``Pattern dynamics in rotating convection at finite Prandtl number''
       Phys. Rev. E. 56, 4162-4178 (1997).  [PDF]

[3] Y.Ponty, T.Passot and P.L. Sulem,
      ``Chaos and structures in rotating convection at finite Prandtl number''
       Phys. Rev. Lett79, 71-74 (1997). [PDF]

[2] Y. Ponty, T. Passot and P.L Sulem,
     ``A new instability for finite Prandtl number rotating convection with free-slip boundary conditions'',
Phys. Fluids, 9 , 67-75 (1997). [PDF]

[1] Y. Ponty, A. Pouquet, P.L. Sulem,  "Dynamos in weakly chaotic two-dimensional flows"
      Geophys. Astrophys. Fluid Dyn. 79 , 239-257 (1995). [PDF]

Book chapter :

  Yannick Ponty,
       "Numerical modeling of liquid metal dynamo experiments."
       In: Ph. Cardin, L.F. Cugliandolo, editor(s), Les Houches, Session LXXXVIII, 2007,
        Dynamos. Amsterdam: Elsevier, p. 359-382 (2008). [PDF]

Proceeding with referee process :

[4] A. Pouquet, J. Baerenzung, J. Pietarila Graham, P. Mininni, H. Politano, and Y. Ponty,
``Modeling of anisotropic turbulent flows with either magnetic fields or imposed rotation'',
Proceedings of the TI2009 Conference in  "Notes on Numerical Fluid Mechanics and Multidisciplinary Design," Springer;  [PDF]

[3] A.M. Soward , A. Bassom and  Y. Ponty
"Alpha-Quenched alpha^2 Omega-Dynamo waves  in stellar shells"
P. Chossat et al. ed , Dynamo and Dynamics, a Mathematical Challenge
Kluwer Academic Publishers, 297-304 (2001). [PDF]

[2] Y. Ponty, A.D. Gilbert and A.M. Soward
" Dynamo Action due to Ekman layer Instability"
P. Chossat et al. ed , Dynamo and Dynamics, a Mathematical Challenge
Kluwer Academic Publishers,  261-287 (2001). [PDF]

[1] Y. Ponty, A. Pouquet, V. Rom-Kedar, P.L. Sulem,
"Dynamo Action in a Nearly Integrable Chaotic Flow"
in "Solar and planetary Dynamos" 241-248,  (eds.) Cambridge University Press (1993). [PDF]

Thesis (PHD, HDR) :

16 janvier 1997   [PDF]
Thèse de doctorat : Textures convectives dans un fluide en rotation et effet dynamo dans un écoulement chaotique.

31 janvier 2012 
Thèse d'Habilitation à Diriger des Recherches (HDR) : [PDF]
Rôle de la turbulence sur l'effet dynamo et l'induction magnétique.

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