On the existence of flux as a function of the surface elevation for long wave solution of shallow water equations
Authors
-
Sujit K.Bose
S.N. Bose National Center for Basic Sciences, Salt Lake City, Kolkata, 700106, West Bengal, India
https://orcid.org/0000-0003-3867-0969
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Ganesh C. Gorain
Department of Mathematics, J. K. College, Purulia, Purulia, 723101, West Bengal, India
Corresponding Author
https://orcid.org/0000-0002-5326-3635
DOI:
https://doi.org/10.61383/ejam.20242154Keywords:
Shallow water equations, turbulence, horizontal flux, surface elevationAbstract
The shallow water equations in mechanics of fluids, govern the motion of a shallow layer of water over a fixed impervious bed. In this paper, the bed form is assumed to be rough and horizontal, and the motion of water is assumed to be of the long wave type (Lamb [1], pp. 254-256) such that the free surface has a gradually varying propagating profile. Gravitation permits such motion but is resisted by the turbulence generated by the bed friction. A model of the governing equations based on the Reynolds averaged Navier-Stokes equations has recently been given by Bose [2], which is highly nonlinear. A heuristic approach of numerically solving the equations for the modified long waves is also presented in that article, by assuming that the horizontal flux across a section of flow is some function of the free surface elevation alone. This key assertion is analysed in this article and proved to hold provided some boundedness criteria are satisfied by the flux gradients. The theory is apparently applicable to find appropriate boundedness conditions on the flux of flow for numerically solving long wave equations in the case of other models for long wave propagation as well.
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