Documents disponibles écrits par cet auteur

SPH high-performance computing simulations of rigid solids impacting the free-surface of water / Pierre Maruzewski in Journal of hydraulic research, Vol. 48 N° spécial (2010) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 48 N° spécial (2010) . - pp. 126-134 Titre : SPH high-performance computing simulations of rigid solids impacting the free-surface of water Titre original : Calcul haute performance de l'impact de corps solides sur la surface libre de l'eau par la méthode SPH Type de document : texte imprimé Auteurs : Pierre Maruzewski, Auteur ; David le Touzé, Auteur ; Guillaume Oger, Auteur Année de publication : 2010 Article en page(s) : pp. 126-134 Note générale : Hydraulique Résumés en Anglais et Français Langues : Anglais (eng) Mots-clés : Free-surface  flows  High  performance  computing  Hydrodynamic  impact  Parallelization  Scalability  Smoothed  particle  hydrodynamics  Water  entry Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Numerical simulations of water entries based on a three-dimensional parallelized Smoothed Particle Hydrodynamics (SPH) model developed by Ecole Centrale Nantes are presented. The aim of the paper is to show how such SPH simulations of complex 3D problems involving a free surface can be performed on a super computer like the IBM Blue Gene/L with 8,192 cores of Ecole polytechnique fédérale de Lausanne. The present paper thus presents the different techniques which had to be included into the SPH model to make possible such simulations. Memory handling, in particular, is a quite subtle issue because of constraints due to the use of a variable-h scheme. These improvements made possible the simulation of test cases involving hundreds of million particles computed by using thousands of cores. Speedup and efficiency of these parallel calculations are studied. The model capabilities are illustrated in the paper for two water entry problems, firstly, on a simple test case involving a sphere impacting the free surface at high velocity; and secondly, on a complex 3D geometry involving a ship hull impacting the free surface in forced motion. Sensitivity to spatial resolution is investigated as well in the case of the sphere water entry, and the flow analysis is performed by comparing both experimental and theoretical reference results. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] SPH high-performance computing simulations of rigid solids impacting the free-surface of water = Calcul haute performance de l'impact de corps solides sur la surface libre de l'eau par la méthode SPH [texte imprimé] / Pierre Maruzewski, Auteur ; David le Touzé, Auteur ; Guillaume Oger, Auteur . - 2010 . - pp. 126-134. Hydraulique Résumés en Anglais et Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 48 N° spécial (2010) . - pp. 126-134 Mots-clés : Free-surface  flows  High  performance  computing  Hydrodynamic  impact  Parallelization  Scalability  Smoothed  particle  hydrodynamics  Water  entry Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Numerical simulations of water entries based on a three-dimensional parallelized Smoothed Particle Hydrodynamics (SPH) model developed by Ecole Centrale Nantes are presented. The aim of the paper is to show how such SPH simulations of complex 3D problems involving a free surface can be performed on a super computer like the IBM Blue Gene/L with 8,192 cores of Ecole polytechnique fédérale de Lausanne. The present paper thus presents the different techniques which had to be included into the SPH model to make possible such simulations. Memory handling, in particular, is a quite subtle issue because of constraints due to the use of a variable-h scheme. These improvements made possible the simulation of test cases involving hundreds of million particles computed by using thousands of cores. Speedup and efficiency of these parallel calculations are studied. The model capabilities are illustrated in the paper for two water entry problems, firstly, on a simple test case involving a sphere impacting the free surface at high velocity; and secondly, on a complex 3D geometry involving a ship hull impacting the free surface in forced motion. Sensitivity to spatial resolution is investigated as well in the case of the sphere water entry, and the flow analysis is performed by comparing both experimental and theoretical reference results. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

SPH modeling of shallow-water coastal flows / Mathieu de Leffe in Journal of hydraulic research, Vol. 48 N° spécial (2010) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 48 N° spécial (2010) . - pp. 118-125 Titre : SPH modeling of shallow-water coastal flows Titre original : Modélisation SPH d'écoulements côtiers en eau peu profonde Type de document : texte imprimé Auteurs : Mathieu de Leffe, Auteur ; David le Touzé, Auteur ; Bertrand Alessandrini, Auteur Année de publication : 2010 Article en page(s) : pp. 118-125 Note générale : Hydraulique Résumés en Anglais et Français Langues : Anglais (eng) Mots-clés : Coastal  area  flooding  Coastal  engineering  Shallow-water  flow  Smoothed  particle  hydrodynamics  Tsunami Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : In the present paper, a Smoothed Particle Hydrodynamics (SPH) modeling of the shallow water equations is presented. The objective of this modeling is to perform flooding simulations involving complex bathymetries of sea bottom and dry land. The formulation is first detailed. Its implementation is then described, including specific procedures making possible to follow the expansion of the fluid domain during flooding simulations. An anisotropic kernel with variable smoothing length is especially used, as well as a periodic redistribution of the particles.A number of validation tests are performed. The model results are first checked on the case of a dam break on a flat dry bottom in one and two dimensions. Then more complex two-dimensional cases are simulated and compared to other models and experiments, e.g. a dam break flooding a slope of complex shape, and a solitary wave running up an island. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] SPH modeling of shallow-water coastal flows = Modélisation SPH d'écoulements côtiers en eau peu profonde [texte imprimé] / Mathieu de Leffe, Auteur ; David le Touzé, Auteur ; Bertrand Alessandrini, Auteur . - 2010 . - pp. 118-125. Hydraulique Résumés en Anglais et Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 48 N° spécial (2010) . - pp. 118-125 Mots-clés : Coastal  area  flooding  Coastal  engineering  Shallow-water  flow  Smoothed  particle  hydrodynamics  Tsunami Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : In the present paper, a Smoothed Particle Hydrodynamics (SPH) modeling of the shallow water equations is presented. The objective of this modeling is to perform flooding simulations involving complex bathymetries of sea bottom and dry land. The formulation is first detailed. Its implementation is then described, including specific procedures making possible to follow the expansion of the fluid domain during flooding simulations. An anisotropic kernel with variable smoothing length is especially used, as well as a periodic redistribution of the particles.A number of validation tests are performed. The model results are first checked on the case of a dam break on a flat dry bottom in one and two dimensions. Then more complex two-dimensional cases are simulated and compared to other models and experiments, e.g. a dam break flooding a slope of complex shape, and a solitary wave running up an island. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com