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Title: An entropy preserving finite-element/finite-volume pressure correction scheme for the drift-flux model
Authors: Laura Gastaldo (LATP, IRSN), Raphaele Herbin (LATP), Jean-Claude Latché (IRSN)
Categories: math.NA Numerical Analysis
MSC: 65N12,65N30,76N10,76T05,76M25
Abstract: We present in this paper a pressure correction scheme for the drift-flux
model combining finite element and finite volume discretizations, which is
shown to enjoy essential stability features of the continuous problem: the
scheme is conservative, the unknowns are kept within their physical bounds and,
in the homogeneous case (i.e. when the drift velocity vanishes), the discrete
entropy of the system decreases; in addition, when using for the drift velocity
a closure law which takes the form of a Darcy-like relation, the drift term
becomes dissipative. Finally, the present algorithm preserves a constant
pressure and a constant velocity through moving interfaces between phases. To
ensure the stability as well as to obtain this latter property, a key
ingredient is to couple the mass balance and the transport equation for the
dispersed phase in an original pressure correction step. The existence of a
solution to each step of the algorithm is proven; in particular, the existence
of a solution to the pressure correction step is derived as a consequence of a
more general existence result for discrete problems associated to the
drift-flux model. Numerical tests show a near-first-order convergence rate for
the scheme, both in time and space, and confirm its stability.
Owner: Raphaele Herbin
Version 1: Mon, 17 Mar 2008 15:13:22 GMT