The paper is devoted to the analysis of weak solutions of exterior problem for Navier-Stokes equations. It is stated that it is necessary to use a weak solution because the speed of acoustic waves in compressible models approximating Navier-Stokes equations tends to infinity. A definition of the weak solution is given. It is proved that a weak solution may be obtained as a limiting solution for a system with artificial compressibility and as a limiting solution for a Navier-Stokes-Poisson system. The first system is used for numerical calculations. The second system describes a real physical model. Some estimates for weak solutions are given.

Applications of dispersive estimates to the acoustic pressure waves for incompressible fluid problems

MARCATI, PIERANGELO
2009-01-01

Abstract

The paper is devoted to the analysis of weak solutions of exterior problem for Navier-Stokes equations. It is stated that it is necessary to use a weak solution because the speed of acoustic waves in compressible models approximating Navier-Stokes equations tends to infinity. A definition of the weak solution is given. It is proved that a weak solution may be obtained as a limiting solution for a system with artificial compressibility and as a limiting solution for a Navier-Stokes-Poisson system. The first system is used for numerical calculations. The second system describes a real physical model. Some estimates for weak solutions are given.
2009
978-0-8218-4729-9
dispersive estimates; acoustic pressure waves; incompressible fluid
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12571/3427
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