Comptes Rendus
Mathematical Problems in Mechanics
Viscous potential free-surface flows in a fluid layer of finite depth
[Écoulements viscopotentiels avec surface libre en profondeur finie]
Comptes Rendus. Mathématique, Volume 345 (2007) no. 2, pp. 113-118.

Nous montrons comment modéliser les écoulements à surface libre faiblement dissipatifs en utilisant une approche potentielle. La décomposition de Helmholtz–Leray est appliquée aux équations de Navier–Stokes linéarisées. Le problème est étudié au moyen de la transformée de Fourier–Laplace. Nous montrons comment exprimer la partie rotationnelle de la vitesse en fonction du potentiel des vitesses et de l'élévation de la surface libre. Un nouveau terme nonlocal prépondérant apparaît dans la condition cinématique au fond. La formulation finale est simple et ne requiert pas de corrections ultérieures comme dans Joseph et Wang, 2004. Un modèle d'ondes longues est obtenu à partir de ces nouvelles équations.

It is shown how to model weakly dissipative free-surface flows using the classical potential flow approach. The Helmholtz–Leray decomposition is applied to the linearized 3D Navier–Stokes equations. The governing equations are treated using Fourier–Laplace transforms. We show how to express the vortical component of the velocity only in terms of the potential and free-surface elevation. A new predominant nonlocal viscous term is derived in the bottom kinematic boundary condition. The resulting formulation is simple and does not involve any correction procedure as in previous viscous potential flow theories (Joseph and Wang, 2004). Corresponding long wave model equations are derived.

Reçu le :
Accepté le :
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DOI : 10.1016/j.crma.2007.06.007
Denys Dutykh 1 ; Frédéric Dias 1

1 CMLA, ENS Cachan, CNRS, PRES UniverSud, 61, avenue du Président Wilson, 94230 Cachan cedex, France
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Denys Dutykh; Frédéric Dias. Viscous potential free-surface flows in a fluid layer of finite depth. Comptes Rendus. Mathématique, Volume 345 (2007) no. 2, pp. 113-118. doi : 10.1016/j.crma.2007.06.007. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.1016/j.crma.2007.06.007/

[1] J. Boussinesq Lois de l'extinction de la houle en haute mer, C. R. Acad. Sci. Paris, Volume 121 (1895), pp. 15-20

[2] M. Chen; O. Goubet Long-time asymptotic behaviour of dissipative Boussinesq systems, Discrete and Continuous Dynamical Systems, Volume 17 (2007), pp. 61-80

[3] F. Dias, A.I. Dyachenko, V.E. Zakharov, Theory of weakly damped free-surface flows: a new formulation based on potential flow solutions, (2007), submitted for publication

[4] D. Dutykh, F. Dias, Dissipative Boussinesq equations, C. R. Acad. Sci. Paris, Ser. I (2007), in press

[5] A.I. Dyachenko; A.O. Korotkevich; V.E. Zakharov Weak turbulence of gravity waves, JETP Lett., Volume 77 (2003), pp. 546-550

[6] A.I. Dyachenko; A.O. Korotkevich; V.E. Zakharov Weak turbulent Kolmogorov spectrum for surface gravity waves, Phys. Rev. Lett., Volume 92 (2004), p. 134501

[7] D.D. Joseph; J. Wang The dissipation approximation and viscous potential flow, J. Fluid Mech., Volume 505 (2004), pp. 365-377

[8] T. Kakutani; K. Matsuuchi Effect of viscosity on long gravity waves, J. Phys. Soc. Japan, Volume 39 (1975), pp. 237-246

[9] H. Lamb Hydrodynamics, Cambridge University Press, 1932

[10] C.C. Mei The Applied Dynamics of Ocean Surface Waves, World Scientific, 1994

[11] V.E. Zakharov; A.O. Korotkevich; A.N. Pushkarev; A.I. Dyachenko Mesoscopic wave turbulence, JETP Lett., Volume 82 (2005), pp. 487-491

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