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On weak solutions of steady Navier-Stokes equations for monatomic gas

Jan Březina, Antonín Novotný (2008)

Commentationes Mathematicae Universitatis Carolinae

We use L estimates for the inverse Laplacian of the pressure introduced by Plotnikov, Sokolowski and Frehse, Goj, Steinhauer together with the nonlinear potential theory due to Adams, Hedberg, to get a priori estimates and to prove existence of weak solutions to steady isentropic Navier-Stokes equations with the adiabatic constant γ > 1 3 ( 1 + 13 ) 1 . 53 for the flows powered by volume non-potential forces and with γ > 1 8 ( 3 + 41 ) 1 . 175 for the flows powered by potential forces and arbitrary non-volume forces. According to our knowledge,...

On weak solutions to the equations of non-stationary motion of heat-conducting incompressible viscous fluids: defect measure and energy equality

Joachim Naumann (2008)

Banach Center Publications

We consider the non-stationary Navier-Stokes equations completed by the equation of conservation of internal energy. The viscosity of the fluid is assumed to depend on the temperature, and the dissipation term is the only heat source in the conservation of internal energy. For the system of PDE's under consideration, we prove the existence of a weak solution such that: 1) the weak form of the conservation of internal energy involves a defect measure, and 2) the equality for the total energy is satisfied....

On weakly A-harmonic tensors

Bianca Stroffolini (1995)

Studia Mathematica

We study very weak solutions of an A-harmonic equation to show that they are in fact the usual solutions.

On weak-strong uniqueness property for full compressible magnetohydrodynamics flows

Weiping Yan (2013)

Open Mathematics

This paper is devoted to the study of the weak-strong uniqueness property for full compressible magnetohydrodynamics flows. The governing equations for magnetohydrodynamic flows are expressed by the full Navier-Stokes system for compressible fluids enhanced by forces due to the presence of the magnetic field as well as the gravity and an additional equation which describes the evolution of the magnetic field. Using the relative entropy inequality, we prove that a weak solution coincides with the...

On weighted estimates of solutions of nonlinear elliptic problems

Igor V. Skrypnik, Dmitry V. Larin (1999)

Mathematica Bohemica

The paper is devoted to the estimate u(x,k)Kk{capp,w(F)pw(B(x,))} 1p-1, 2 p < n for a solution of a degenerate nonlinear elliptic equation in a domain B ( x 0 , 1 ) F , F B ( x 0 , d ) = { x n | x 0 - x | < d } , d < 1 2 , under the boundary-value conditions u ( x , k ) = k for x F , u ( x , k ) = 0 for x B ( x 0 , 1 ) and where 0 < ρ d i s t ( x , F ) , w ( x ) is a weighted function from some Muckenhoupt class, and c a p p , w ( F ) , w ( B ( x , ρ ) ) are weighted capacity and measure of the corresponding sets.

Ondes de surface faiblement non-linéaires

Sylvie Benzoni-Gavage, Jean-François Coulombel, Nikolay Tzvetkov (2011/2012)

Séminaire Laurent Schwartz — EDP et applications

Cet exposé concerne l’approximation faiblement non-linéaire de problèmes aux limites invariants par changement d’échelles.

Currently displaying 1901 – 1920 of 2162