Abstract
We consider the notion of a functional solution of the Euler equations for incompressible fluid flows. We show that a functional solution can be constructed under “very weak” a priori estimates on approximate solution sequences of the equation; an estimate uniform in L 1loc together with weak consistency with the equation is sufficient to construct a solution. We prove that if we have an estimate uniform in L 2loc available for the approximate solution sequence, then the structured functional solution just described becomes a measure-valued solution in the sense of DiPerna & Majda. We also show that a functional solution can be obtained from a measure-valued solution. We give an example showing that a much higher concentration of energy than in the case of measure-valued solutions is allowed by the approximation procedure of a functional solution.
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Communicated by C. Dafermos
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Chae, D., Dubovskii, P. Functional and measure-valued solutions of the euler equations for flows of incompressible fluids. Arch. Rational Mech. Anal. 129, 385–396 (1995). https://doi.org/10.1007/BF00379261
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DOI: https://doi.org/10.1007/BF00379261