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We consider a real two-fluid system of compressible viscous fluids with a common velocity field and algebraic closure for the pressure law. The constitutive relation involves densities of both fluids through an implicit function. The…

Analysis of PDEs · Mathematics 2026-02-24 Yang Li , Mária Lukáčová-Medvid'ová , Milan Pokorný , Ewelina Zatorska

We extend the weak-strong uniqueness principle to general models of compressible viscous fluids near/on the vacuum. In particular, the physically relevant case of positive density with polynomial decay at infinity is considered.

Analysis of PDEs · Mathematics 2021-09-01 Eduard Feireisl , Antonin Novotny

We introduce the notion of relative entropy for the weak solutions of the compressible Navier-Stokes system. We show that any finite energy weak solution satisfies a relative entropy inequality for any pair of sufficiently smooth test…

Analysis of PDEs · Mathematics 2015-06-03 Eduard Feireisl , Bum Ja Jin , Antonin Novotny

We give a survey of recent results on weak-strong uniqueness for compressible and incompressible Euler and Navier-Stokes equations, and also make some new observations. The importance of the weak-strong uniqueness principle stems, on the…

Analysis of PDEs · Mathematics 2017-05-12 Emil Wiedemann

In this work, we introduce a notion of dissipative weak solution for a system describing the evolution of a heat-conducting incompressible non-Newtonian fluid. This concept of solution is based on the balance of entropy instead of the…

Analysis of PDEs · Mathematics 2022-06-13 Pablo Alexei Gazca-Orozco , Victoria Patel

The weak-strong uniqueness of solutions to a broad class of cross-diffusion systems with volume filling is established. In general, the diffusion matrices are neither symmetric nor positive definite. This issue is overcome by supposing that…

Analysis of PDEs · Mathematics 2025-10-01 Maria Heitzinger , Ansgar Jüngel

We establish weak-strong uniqueness and stability properties of renormalised solutions to a class of energy-reaction-diffusion systems. The systems considered are motivated by thermodynamically consistent models, and their formal entropy…

Analysis of PDEs · Mathematics 2022-05-03 Katharina Hopf

We derive a relative entropy inequality for capillary compressible fluids with density dependent viscosity. Applications in the context of weak-strong uniqueness analysis, pressureless fluids and high-Mach number flows are presented.

Analysis of PDEs · Mathematics 2023-05-17 Matteo Caggio , Donatella Donatelli

Our paper deals with three-dimensional nonsteady Navier-Stokes equations for non-Newtonian compressible fluids. It contains a~derivation of the relative energy inequality for the weak solutions to these equations. We show that the standard…

Analysis of PDEs · Mathematics 2022-10-25 Richard Andrášik , Václav Mácha , Rostislav Vodák

We prove weak-strong uniqueness results for the compressible Navier-Stokes system with degenerate viscosity coefficient and with vacuum in one dimension. In other words, we give conditions on the weak solution constructed in \cite{Jiu} so…

Analysis of PDEs · Mathematics 2014-12-01 Boris Haspot

Bounded weak solutions to a particular class of degenerate parabolic cross-diffusion systems are shown to coincide with the unique strong solution determined by the same initial condition on the maximal existence interval of the latter. The…

Analysis of PDEs · Mathematics 2022-07-04 Philippe Laurençot , Bogdan-Vasile Matioc

In this work we employ the relative energy method to obtain a weak-strong uniqueness principle for a Euler-Riesz system, as well as to establish its convergence in the high-friction limit towards a gradient flow equation. The main technical…

Analysis of PDEs · Mathematics 2024-07-09 Nuno J. Alves , José A. Carrillo , Young-Pil Choi

In this paper, our goal is to define a measure valued solution of compressible Navier--Stokes--Fourier system for a heat conducting fluid with Dirichlet boundary condition for temperature in a bounded domain. The definition is based on the…

Analysis of PDEs · Mathematics 2022-07-05 Nilasis Chaudhuri

This paper is concerned with a compressible MHD equations describing the evolution of viscous non-resistive fluids in piecewise regular bounded Lipschitz domains. Under the general inflow-outflow boundary conditions, we prove existence of…

Analysis of PDEs · Mathematics 2025-01-28 Yang Li , Young-Sam Kwon , Yongzhong Sun

This paper concerns with the compressible two-fluid model with algebraic pressure closure. We prove a conditional weak-strong uniqueness principle, meaning that a finite energy weak solution, with bounded densities, coincides with the…

Analysis of PDEs · Mathematics 2021-12-02 Yang Li , Ewelina Zatorska

This paper is devoted to the study of the weak-strong uniqueness property for the full compressible magnetohydrodynamics flows. The governing equations for magnetohydrodynamic flows are expressed by the full Navier-Stokes system for…

Analysis of PDEs · Mathematics 2013-01-16 Weiping Yan

The Navier-Stokes-Fourier system describing the motion of a compressible, viscous, and heat conducting fluid is known to possess global-in-time weak solutions for any initial data of finite energy. We show that a weak solution coincides…

Analysis of PDEs · Mathematics 2015-06-03 Eduard Feireisl , Antonin Novotny

We consider the Cauchy problem for incompressible viscoelastic fluids in the whole space $\mathbb{R}^d$ ($d=2,3$). By introducing a new decomposition via Helmholtz's projections, we first provide an alternative proof on the existence of…

Analysis of PDEs · Mathematics 2023-07-28 Xianpeng Hu , Hao Wu

A Maxwell-Stefan system for fluid mixtures with driving forces depending on Cahn-Hilliard-type chemical potentials is analyzed. The corresponding parabolic cross-diffusion equations contain fourth-order derivatives and are considered in a…

Analysis of PDEs · Mathematics 2022-05-16 Xiaokai Huo , Ansgar Jüngel , Athanasios E. Tzavaras

So far existence of dissipative weak solutions for the compressible Navier-Stokes equations (i.e. weak solutions satisfying the relative energy inequality) is known only in the case of boundary conditions with non zero inflow/outflow (i.e.,…

Analysis of PDEs · Mathematics 2019-05-08 Young-Sam Kwon , Antonin Novotny , Vladyslav Satko
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