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About steady transport equation I – L p -approach in domains with smooth boundaries

Antonín Novotný — 1996

Commentationes Mathematicae Universitatis Carolinae

We investigate the steady transport equation λ z + w · z + a z = f , λ > 0 in various domains (bounded or unbounded) with smooth noncompact boundaries. The functions w , a are supposed to be small in appropriate norms. The solution is studied in spaces of Sobolev type (classical Sobolev spaces, Sobolev spaces with weights, homogeneous Sobolev spaces, dual spaces to Sobolev spaces). The particular stress is put onto the problem to extend the results to as less regular vector fields w , a , as possible (conserving the requirement of...

Some remarks to the compactness of steady compressible isentropic Navier-Stokes equations via the decomposition method

Antonín Novotný — 1996

Commentationes Mathematicae Universitatis Carolinae

In [18]–[19], P.L. Lions studied (among others) the compactness and regularity of weak solutions to steady compressible Navier-Stokes equations in the isentropic regime with arbitrary large external data, in particular, in bounded domains. Here we investigate the same problem, combining his ideas with the method of decomposition proposed by Padula and myself in [29]. We find the compactness of the incompressible part u of the velocity field v and we give a new proof of the compactness of the “effective...

Weak solutions for steady compressible Navier-Stokes-Fourier system in two space dimensions

Antonín NovotnýMilan Pokorný — 2011

Applications of Mathematics

We consider steady compressible Navier-Stokes-Fourier system in a bounded two-dimensional domain. We show the existence of a weak solution for arbitrarily large data for the pressure law p ( ϱ , ϑ ) ϱ γ + ϱ ϑ if γ > 1 and p ( ϱ , ϑ ) ϱ ln α ( 1 + ϱ ) + ϱ ϑ if γ = 1 , α > 0 , depending on the model for the heat flux.

Steady plane flow of viscoelastic fluid past an obstacle

Antonín NovotnýMilan Pokorný — 2002

Applications of Mathematics

We consider the steady plane flow of certain classes of viscoelastic fluids in exterior domains with a non-zero velocity prescribed at infinity. We study existence as well as asymptotic behaviour of solutions near infinity and show that for sufficiently small data the solution decays near infinity as fast as the fundamental solution to the Oseen problem.

Global weak solvability to the regularized viscous compressible heat conductive flow

Jiří NeustupaAntonín Novotný — 1991

Applications of Mathematics

The concept of regularization to the complete system of Navier-Stokes equations for viscous compressible heat conductive fluid is developed. The existence of weak solutions for the initial boundary value problem for the modified equations is proved. Some energy and etropy estimates independent of the parameter of regularization are derived.

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

Jan BřezinaAntonín 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,...

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