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Derivation and numerical approximation of hyperbolic viscoelastic flow systems: Saint-Venant 2D equations for Maxwell fluids. (arXiv:1712.04257v1 [math.NA])
来源于:arXiv
We pursue here the development of models for complex (viscoelastic) fluids in
shallow free-surface gravity flows which was initiated by [Bouchut-Boyaval,
M3AS (23) 2013] for 1D (translation invariant) cases. The models we propose are
hyperbolic quasilinear systems that generalize Saint-Venant shallow-water
equations to incompressible Maxwell fluids. The models are compatible with a
formulation of the thermo-dynamics second principle. In comparison with
Saint-Venant standard shallow-water model, the momentum balance includes
extra-stresses associated with an elastic potential energy in addition to a
hydrostatic pressure. The extra-stresses are determined by an additional tensor
variable solution to a differential equation with various possible time rates.
For the numerical evaluation of solutions to Cauchy problems, we also propose
explicit schemes discretizing our generalized Saint-Venant systems with
Finite-Volume approximations that are entropy-consistent (under a CFL
constraint) in 查看全文>>