778 articles – 1385 references  [version française]
 HAL: hal-00667121, version 1
 Applied Mathematics Letters 25, 11 (2012) 1681--1688
 A fast vector penalty-projection method for incompressible non-homogeneous or multiphase Navier-Stokes problems
 Philippe Angot ( ) 1, Jean-Paul Caltagirone 2, 3
 (2012-11)
 We present a new {\em fast vector penalty-projection method (VPP$_{\eps}$)} to efficiently compute the solution of unsteady Navier-Stokes problems governing incompressible multiphase viscous flows with variable density and/or viscosity. The key idea of the method is to compute at each time step an accurate and curl-free approximation of the pressure gradient increment in time. This method performs a {\em two-step approximate divergence-free vector projection} yielding a velocity divergence vanishing as $\cO(\eps\,\dt)$, $\dt$ being the time step, with a penalty parameter $\eps$ as small as desired until the machine precision, {\em e.g.} $\eps=10^{-14}$, whereas the solution algorithm can be extremely fast and cheap. Indeed, the proposed {\em vector correction step} typically requires only a few iterations of a suitable preconditioned Krylov solver whatever the spatial mesh step. The method is numerically validated on three benchmark problems for non-homogeneous or multiphase flows where we compare it to the Uzawa augmented Lagrangian (UAL) and scalar incremental projection (SIP) methods. Moreover, a new test case for fluid-structure interaction problems is also investigated. That results in a very robust method running faster than usual methods and being able to efficiently and accurately compute sharp test cases whatever the density, viscosity or anisotropic permeability jumps, whereas other methods crash.
 1: Laboratoire d'Analyse, Topologie, Probabilités (LATP) CNRS : UMR6632 – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III 2: Transferts, écoulements, fluides, énergétique (TREFLE) CNRS : UMR8508 – Université Sciences et Technologies - Bordeaux I – École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB) – Arts et Métiers ParisTech 3: Institut de Mécanique et d'Ingénierie de Bordeaux (I2M) Université Sciences et Technologies - Bordeaux I – CNRS : UMR5295 – Arts et Métiers ParisTech – Institut Polytechnique de Bordeaux 4: Institut de Mathématiques de Bordeaux (IMB) CNRS : UMR5251 – Université Sciences et Technologies - Bordeaux I – Université Victor Segalen - Bordeaux II
 Research team: EDP
 Subject : Mathematics/Numerical AnalysisMathematics/Analysis of PDEsPhysics/Mechanics/Mechanics of the fluidsPhysics/Physics/Fluid DynamicsPhysics/Physics/Computational PhysicsEngineering Sciences/Mechanics/Fluids mechanicsEngineering Sciences/Reactive fluid environment
 Keyword(s): Vector penalty-projection method – Divergence-free penalty-projection – Penalty method – Splitting prediction-correction scheme – Navier-Stokes equations – incompressible non-homogeneous or multiphase flows
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 hal-00667121, version 1 http://hal.archives-ouvertes.fr/hal-00667121 oai:hal.archives-ouvertes.fr:hal-00667121 From: Philippe Angot <> Submitted on: Tuesday, 7 February 2012 00:01:53 Updated on: Friday, 20 July 2012 19:12:27