Geodesic
Oscillations of stratified fluids
Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 29 (2008), pp. 103-130

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We study the problem on small motions and normal oscillations of a system of two heavy immiscible stratified fluids partially filling a fixed vessel. The lower fluid is assumed to be viscous, while the upper one is assumed to be ideal. We find sufficient existence conditions for a strong (with respect to the time variable) solution of the initial-boundary value problem describing the evolution of the specified hydraulic system. For the corresponding spectral system, we obtain results about the localization of the spectrum, asymptotic behavior of branches of eigenvalues, and existence of the substantial spectrum of the problem. 
@article{CMFD_2008_29_a6,
     author = {N. D. Kopachevskii and D. O. Tsvetkov},
     title = {Oscillations of stratified fluids},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {103--130},
     publisher = {mathdoc},
     volume = {29},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2008_29_a6/}
}
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N. D. Kopachevskii; D. O. Tsvetkov. Oscillations of stratified fluids. Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 29 (2008), pp. 103-130. http://geodesic.mathdoc.fr/item/CMFD_2008_29_a6/