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Existence of large-data global weak solutions to kinetic models of nonhomogeneous dilute polymeric fluids

  • *Corresponding author: Chuhui He

    *Corresponding author: Chuhui He 
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  • We prove the existence of large-data global-in-time weak solutions to a general class of coupled bead-spring chain models with finitely extensible nonlinear elastic (FENE) type spring potentials for nonhomogeneous incompressible dilute polymeric fluids in a bounded domain in $ \mathbb{R}^d $, $ d = 2 $ or $ 3 $. The class of models under consideration involves the Navier–Stokes system with variable density, where the viscosity coefficient depends on both the density and the polymer number density, coupled to a Fokker–Planck equation with a density-dependent drag coefficient. The proof is based on combining a truncation of the probability density function with a two-stage Galerkin approximation and weak compactness and compensated compactness techniques to pass to the limits in the sequence of Galerkin approximations and in the truncation level.

    Mathematics Subject Classification: Primary: 35Q30, 35Q84, 76D05, 76D03, 82D60.

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