
Vanishing capillarity limit of the Navier-Stokes-Korteweg system in one dimension with degenerate viscosity coefficient and discontinuous initial density
Burtea, Cosmin; Haspot, Boris (2022), Vanishing capillarity limit of the Navier-Stokes-Korteweg system in one dimension with degenerate viscosity coefficient and discontinuous initial density, SIAM Journal on Mathematical Analysis, 54, 2, p. 36. 10.1137/21M1428686
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Article accepté pour publication ou publiéDate
2022Journal name
SIAM Journal on Mathematical AnalysisVolume
54Number
2Publisher
SIAM - Society for Industrial and Applied Mathematics
Pages
36
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Burtea, CosminInstitut de Mathématiques de Jussieu - Paris Rive Gauche [IMJ-PRG (UMR_7586)]
Haspot, Boris
CEntre de REcherches en MAthématiques de la DEcision [CEREMADE]
Abstract (EN)
In the first main result of this paper we prove that one can approximate discontinious solutions of the 1d Navier Stokes system with solutions of the 1d Navier-Stokes-Korteweg system as the capilarity parameter tends to 0. Moreover, we allow the viscosity coefficients µ = µ (ρ) to degenerate near vaccum. In order to obtain this result, we propose two main technical novelties. First of all, we provide an upper bound for the density verifing NSK that does not degenerate when the capillarity coefficient tends to 0. Second of all, we are able to show that the positive part of the effective velocity is bounded uniformly w.r.t. the capillary coefficient. This turns out to be crucial in providing a lower bound for the density. The second main result states the existene of unique finite-energy global strong solutions for the 1d Navier-Stokes system assuming only that ρ0, 1/ρ0 ∈ L ∞. This last result finds itself a natural application in the context of the mathematical modeling of multiphase flows.Subjects / Keywords
Navier--Stokes in one dimension; fluid mechanics; effective velocityRelated items
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