On some geometrical aspects of the potential structure of the equations of evolution: The case of Navier-Stokes

Abstract

In this paper we discuss the potential structure of the evolution equations, in particular Navier-Stokes. To this end, the method of prolongation of Wahlquist H. D. and EstabrookF. B., J. Math. Phys., 16 (1975) 1 is introduced and the most general potential for the flowvelocity is found, expressing everything in terms of the representative differential forms of the system of equations. Steady-flow and self-similar solutions and conditions are presented and brieflydiscussed, as well as the most general solution when a general transformation similar to the onegiven by Cole is introduced into the original system. In this theoretical context, the solutioncan be associated with a damped acoustic wave. Consequently, a useful application area for thepresent work is certainly in nonlinear acoustics, as we discuss briefly at the end of this letter.