Inhomogeneous incompressible Euler with codimension $1$ singular structures

TL;DR

This paper investigates the energy dissipation in inhomogeneous incompressible Euler equations with codimension one singular structures, showing dissipation vanishes on certain interfaces despite jumps in physical quantities.

Contribution

It establishes a Duchon--Robert type approximation theorem for solutions with BV regularity, analyzing dissipation behavior near hypersurfaces in incompressible fluid models.

Findings

Dissipation measure does not concentrate on hypersurfaces of codimension one.

Dissipation vanishes if concentrated on a set of finite perimeter.

Results apply to systems with immiscible fluids separated by Lipschitz interfaces.

Abstract

This paper is concerned with the inhomogeneous incompressible Euler system. We establish a Duchon--Robert type approximation theorem for the distribution describing the local energy flux of bounded solutions. The velocity field is assumed to have bounded variation or bounded deformation with respect to the spatial variable. The density satisfies no-vacuum condition and has $BV$ regularity in space, allowing for a system made by two immiscible fluids separated by a Lipschitz hypersurface. By means of a careful analysis of the traces along hypersufaces of bounded vector fields with measure divergence, we show that the dissipation does not give mass to hypersurfaces of codimension one, even if the velocity field, the density and the pressure have jumps. This feature is specific of incompressible models. As a consequence, we show that the dissipation measure vanishes if it is concentrated on a countably rectifiable set of space-time codimension one, even if this is dense. For instance, in the simplest case of a system made by two incompressible immiscible fluids with $BV$ velocity, the dissipation measure vanishes as soon as the interface between the two fluids has (space-time) finite perimeter.