| HAL : hal-00482143, version 1 |
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| International Journal on Finite Volumes 6, 1 (2009) 1-26 |
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| Error analysis of the Penalty-Projection method for the time dependent Stokes equations |
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| Philippe Angot 1Matthieu Jobelin 2 |
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| (26/01/2009) |
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| We address in this paper a fractional-step scheme for the simulation of incompressible flows falling in the class of penalty-projection methods. The velocity prediction is similar to a penalty method prediction step, or, equivalently, differs from the incremental projection method one by the introduction of a penalty term built to enforce the divergence-free constraint. Then, a projection step based on a pressure Poisson equation is performed, to update the pressure and obtain an (approximately) divergence-free end-of-step velocity. An analysis in the energy norms for the model unsteady Stokes problem shows that this scheme enjoys the time convergence properties of both underlying methods: for low value of the penalty parameter r, the splitting error estimates of the so-called rotational projection scheme are recovered, i.e. convergence as $δt^2$ and $δt^{3/2}$ for the velocity and the pressure, respectively; for high values of the penalty parameter, we obtain the $δt/r$ behaviour for the velocity error known for the penalty scheme, together with a $1/r$ behaviour for the pressure error. Some numerical tests are presented, which substantiate this analysis. |
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| 1 : | Laboratoire d'Analyse, Topologie, Probabilités (LATP) |
| CNRS : UMR6632 – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III | |
| 2 : | Laboratoire d'Etudes et de Simulation des Accidents Graves (DPAM/SEMCA/LESAG) |
| IRSN | |
| 3 : | Institut de radioprotection et de sûreté nucléaire (IRSN) |
| Ministère de l'écologie de l'Energie, du Développement durable et de l'Aménagement du territoire – Ministère de l'économie, de l'industrie et de l'emploi – Ministère de l'Enseignement Supérieur et de la Recherche Scientifique – Ministère de la Défense – Ministère de la santé | |
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| Domaine | : | Mathématiques/Analyse numérique Sciences de l'ingénieur/Mécanique/Mécanique des fluides Physique/Mécanique/Mécanique des fluides |
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| Finite elements – Unsteady Stokes equations – Projection methods – Penalty methods – Penalty-projection method |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00482143, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00482143 | |
| oai:hal.archives-ouvertes.fr:hal-00482143 | |
| Contributeur : Philippe Angot | |
| Soumis le : Dimanche 9 Mai 2010, 13:49:38 | |
| Dernière modification le : Lundi 10 Mai 2010, 09:57:25 | |