# American Institute of Mathematical Sciences

November  2012, 11(6): 2445-2472. doi: 10.3934/cpaa.2012.11.2445

## The rate of attraction of super-critical waves in a Fisher-KPP type model with shear flow

 1 Institut de Mathématiques (UMR CNRS 5219), Université Paul Sabatier, 31062 Toulouse Cedex 4, France 2 Laboratoire MIP, Université Paul Sabatier, 31062 Toulouse Cedex 9

Received  October 2010 Revised  June 2011 Published  April 2012

We consider in this paper the thermo-diffusive model for flame propagation, which is a reaction-diffusion equation of the KPP (Kolmogorov, Petrovskii, Piskunov) type, posed on an infinite cylinder. Such a model has a family of travelling waves of constant speed, larger than a critical speed $c_*$. The family of all supercritical waves attract a large class of initial data, and we try to understand how. We describe in this paper the fate of an initial datum trapped between two supercritical waves of the same velocity: the solution will converge to a whole set of translates of the same wave, and we identify the convergence dynamics as that of an effective drift, around which an effective diffusion process occurs.
Citation: Patrick Martinez, Jean-Michel Roquejoffre. The rate of attraction of super-critical waves in a Fisher-KPP type model with shear flow. Communications on Pure & Applied Analysis, 2012, 11 (6) : 2445-2472. doi: 10.3934/cpaa.2012.11.2445
##### References:
 [1] B. Audoly, H. Berestycki and Y. Pomeau, Réaction-diffusion en écoulement rapide,, C. R. Acad. Sci.Paris, 328 (2000), 255. Google Scholar [2] M. Bages, "Équations de réaction-diffusion de type KPP: ondes pulsatoires, dynamique non triviale et applications,", Ph.D thesis, (2007). Google Scholar [3] M. Bages, P. Martinez and J.-M. Roquejoffre, Dynamique en grand temps pour une classe d'équations de type KPP en milieu périodique,, C.R. Acad. Sci. Paris, 346 (2008), 1051. Google Scholar [4] M. Bages, P. Martinez and J.-M. Roquejoffre, How travelling waves attract solutions of KPP-type equations,, Trans A.M.S., (). Google Scholar [5] H. Berestycki and F. Hamel, Generalized travelling waves for reaction-diffusion equations,, In, 446 (): 101. Google Scholar [6] F. Benkhaldoun and B. Larrouturou, Numerical analysis of the two-dimensional thermodiffusive model for flame propagation,, RAIRO Mod\el. Math. Anal. Num\'er., 22 (1988), 535. Google Scholar [7] H. Berestycki and B. Larrouturou, Quelques aspects mathématiques de la propagation des flammes prémélangées,, Nonlinear Partial Differential Equations and their Applications, (1991), 65. Google Scholar [8] H. Berestycki and L. Nirenberg, Travelling fronts in cylinders,, Ann. Inst. H. Poincar\'e, 9 (1992), 497. Google Scholar [9] M. Bramson, Convergence of solutions of the Kolmogorov equation to travelling waves,, Memoirs of the AMS, 44 (1983). Google Scholar [10] P. Collet and J. P. Eckmann, Space-time behaviour in problems of hydrodynamic type: a case study,, Nonlinearity, 5 (1992), 1265. doi: 10.1088/0951-7715/5/6/004. Google Scholar [11] U. Ebert and W. van Saarloos, Front propagation into unstable states: universal algebraic convergence towards uniformly translating pulled fronts,, Physica D, 146 (2000), 1. doi: 10.1016/S0167-2789(00)00068-3. Google Scholar [12] A. Fannjiang and G. Papanicolaou, Convection Enhanced Diffusion for Periodic Flows,, SIAM J. Appl. Math., 54 (1994), 333. doi: 10.1137/S0036139992236785. Google Scholar [13] F. Hamel and N. Nadirashvili, Travelling fronts and entire solutions of the Fisher-KPP equation in $\RR^N$,, Arch. Ration. Mech. Anal., 157 (2001), 91. doi: 10.1007/PL00004238. Google Scholar [14] F. Hamel and L. Roques, Uniqueness and stability of monostable pulsating travelling fronts,, J. European Math. Soc, (). Google Scholar [15] F. Hamel and L. Ryzhik, Non-adiabatic KPP fronts with an arbitrary Lewis number,, Nonlinearity, 18 (2005), 2881. doi: 10.1088/0951-7715/18/6/024. Google Scholar [16] D. Henry, "Geometric Theory of Semilinear Parabolic Equations,", Lecture Notes in Mathematics, 840 (). Google Scholar [17] A. Kiselev and L. Ryzhik, Enhancement of the traveling front speeds in reaction-diffusion equations with advection,, Ann. de l'Inst. Henri Poincar\'e, 18 (2001), 309. Google Scholar [18] A. N. Kolmogorov, I. G. Petrovskii and N. S. Piskunov, A study of the equation of diffusion with increase in the quantity of matter, and its application to a biological problem,, Bjul. Moskowskogo Gos. Univ., 17 (1937), 1. Google Scholar [19] N. Maman and B. Larrouturou, Dynamical mesh adaption for two-dimensional reactive flow simulations,, in, (1991), 13. Google Scholar [20] P. Martinez and J.-M. Roquejoffre, Convergence to critical waves in KPP equations,, in preparation., (). Google Scholar [21] J.-F. Mallordy and J.-M. Roquejoffre, A parabolic equation of the KPP type in higher dimensions,, SIAM J. Math. Anal., 26 (1995), 1. doi: 10.1137/S0036141093246105. Google Scholar [22] J. R. Norris, Long-time behaviour of heat flow : global estimates and exact asymptotics,, Arch. Rational Mech. Anal., 140 (1997), 161. doi: 10.1007/s002050050063. Google Scholar [23] J. Ortega and E. Zuazua, Large time behaviour in RN for linear parabolic equations with periodic coefficients,, Asymptotic Analysis, 22 (2000), 51. Google Scholar [24] J.-M. Roquejoffre, Eventual monotonicity and convergence to travelling waves for semi-linear parabolic equations in cylinders,, Ann. IHP, 14 (1997), 499. Google Scholar [25] K. Uchiyama, The behaviour of solutions of some nonlinear diffusion equations for large time,, J. Math. Kyoto Univ., 18 (1978), 453. Google Scholar [26] J.-L. Vazqueza and E. Zuazua, Complexity of large time behaviour of evolution equations with bounded data,, Chinese Annals of Mathematics, 23 (2002), 293. Google Scholar

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##### References:
 [1] B. Audoly, H. Berestycki and Y. Pomeau, Réaction-diffusion en écoulement rapide,, C. R. Acad. Sci.Paris, 328 (2000), 255. Google Scholar [2] M. Bages, "Équations de réaction-diffusion de type KPP: ondes pulsatoires, dynamique non triviale et applications,", Ph.D thesis, (2007). Google Scholar [3] M. Bages, P. Martinez and J.-M. Roquejoffre, Dynamique en grand temps pour une classe d'équations de type KPP en milieu périodique,, C.R. Acad. Sci. Paris, 346 (2008), 1051. Google Scholar [4] M. Bages, P. Martinez and J.-M. Roquejoffre, How travelling waves attract solutions of KPP-type equations,, Trans A.M.S., (). Google Scholar [5] H. Berestycki and F. Hamel, Generalized travelling waves for reaction-diffusion equations,, In, 446 (): 101. Google Scholar [6] F. Benkhaldoun and B. Larrouturou, Numerical analysis of the two-dimensional thermodiffusive model for flame propagation,, RAIRO Mod\el. Math. Anal. Num\'er., 22 (1988), 535. Google Scholar [7] H. Berestycki and B. Larrouturou, Quelques aspects mathématiques de la propagation des flammes prémélangées,, Nonlinear Partial Differential Equations and their Applications, (1991), 65. Google Scholar [8] H. Berestycki and L. Nirenberg, Travelling fronts in cylinders,, Ann. Inst. H. Poincar\'e, 9 (1992), 497. Google Scholar [9] M. Bramson, Convergence of solutions of the Kolmogorov equation to travelling waves,, Memoirs of the AMS, 44 (1983). Google Scholar [10] P. Collet and J. P. Eckmann, Space-time behaviour in problems of hydrodynamic type: a case study,, Nonlinearity, 5 (1992), 1265. doi: 10.1088/0951-7715/5/6/004. Google Scholar [11] U. Ebert and W. van Saarloos, Front propagation into unstable states: universal algebraic convergence towards uniformly translating pulled fronts,, Physica D, 146 (2000), 1. doi: 10.1016/S0167-2789(00)00068-3. Google Scholar [12] A. Fannjiang and G. Papanicolaou, Convection Enhanced Diffusion for Periodic Flows,, SIAM J. Appl. Math., 54 (1994), 333. doi: 10.1137/S0036139992236785. Google Scholar [13] F. Hamel and N. Nadirashvili, Travelling fronts and entire solutions of the Fisher-KPP equation in $\RR^N$,, Arch. Ration. Mech. Anal., 157 (2001), 91. doi: 10.1007/PL00004238. Google Scholar [14] F. Hamel and L. Roques, Uniqueness and stability of monostable pulsating travelling fronts,, J. European Math. Soc, (). Google Scholar [15] F. Hamel and L. Ryzhik, Non-adiabatic KPP fronts with an arbitrary Lewis number,, Nonlinearity, 18 (2005), 2881. doi: 10.1088/0951-7715/18/6/024. Google Scholar [16] D. Henry, "Geometric Theory of Semilinear Parabolic Equations,", Lecture Notes in Mathematics, 840 (). Google Scholar [17] A. Kiselev and L. Ryzhik, Enhancement of the traveling front speeds in reaction-diffusion equations with advection,, Ann. de l'Inst. Henri Poincar\'e, 18 (2001), 309. Google Scholar [18] A. N. Kolmogorov, I. G. Petrovskii and N. S. Piskunov, A study of the equation of diffusion with increase in the quantity of matter, and its application to a biological problem,, Bjul. Moskowskogo Gos. Univ., 17 (1937), 1. Google Scholar [19] N. Maman and B. Larrouturou, Dynamical mesh adaption for two-dimensional reactive flow simulations,, in, (1991), 13. Google Scholar [20] P. Martinez and J.-M. Roquejoffre, Convergence to critical waves in KPP equations,, in preparation., (). Google Scholar [21] J.-F. Mallordy and J.-M. Roquejoffre, A parabolic equation of the KPP type in higher dimensions,, SIAM J. Math. Anal., 26 (1995), 1. doi: 10.1137/S0036141093246105. Google Scholar [22] J. R. Norris, Long-time behaviour of heat flow : global estimates and exact asymptotics,, Arch. Rational Mech. Anal., 140 (1997), 161. doi: 10.1007/s002050050063. Google Scholar [23] J. Ortega and E. Zuazua, Large time behaviour in RN for linear parabolic equations with periodic coefficients,, Asymptotic Analysis, 22 (2000), 51. Google Scholar [24] J.-M. Roquejoffre, Eventual monotonicity and convergence to travelling waves for semi-linear parabolic equations in cylinders,, Ann. IHP, 14 (1997), 499. Google Scholar [25] K. Uchiyama, The behaviour of solutions of some nonlinear diffusion equations for large time,, J. Math. Kyoto Univ., 18 (1978), 453. Google Scholar [26] J.-L. Vazqueza and E. Zuazua, Complexity of large time behaviour of evolution equations with bounded data,, Chinese Annals of Mathematics, 23 (2002), 293. Google Scholar
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