Local in time results for local and non-local capillary Navier–Stokes systems with large data

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In this article we study three capillary compressible models (the classical local Navier–Stokes–Korteweg system and two non-local models) for large initial data, bounded away from zero, and with a reference pressure state ρ¯ which is not necessarily stable (P′(ρ¯) can be non-positive). We prove that these systems have a unique local in time solution and we study the convergence rate of the solutions of the non-local models towards the local Korteweg model. The results are given for constant viscous coefficients and we explain how to extend them for density dependant coefficients.