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 : Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

 cv : pdfcv-Y.Ponty.pdf

Free time Activities


MagnetoHydroDynamic (MHD), Dynamo Effect, Fluid Instability,

High Performance Computing (HPC)


NEWS

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]

cover page

  coverpage2017    Fig4 3low           

 

(update 17/04/2018)

[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]
doi.org/10.1103/PhysRevLett.119.234501

[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]
    doi:10.1088/1367-2630/16/10/103001

[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] 
       doi:10.1088/1367-2630/16/7/075014

[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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