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Global-in-time existence of finite energy weak solutions to a relaxed Navier-Stokes-Korteweg model

Florian Oschmann, Florian Wendt

math.AParXiv:2608.12969

Abstract

We consider a parabolic relaxation formulation of the compressible Navier-Stokes-Korteweg system and prove the global-in-time existence of finite energy weak solutions to the associated initial-boundary-value-problem. Our proof is based on a three-level approximation scheme, a weak compactness property of the effective viscous flux, and parabolic regularity estimates. Our result holds for a broad variety of non-monotone pressure functions and generalizes the corresponding results known for the compressible Navier-Stokes equations to the relaxation system.

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