Numerical modeling of erosion using an improvement of the extended finite element method / Cottereau, Régis in European journal of environmental and civil engineering, Vol. 15 N° 8 (Août 2011)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 15 N° 8 (Août 2011) . - pp. 1187-1206 Titre : Numerical modeling of erosion using an improvement of the extended finite element method Titre original : Modélisation numérique de l'érosion avec une amélioration de la méthode des éléments finis étendus Type de document : texte imprimé Auteurs : Cottereau, Régis, Auteur ; Pedro Diez, Auteur Année de publication : 2012 Article en page(s) : pp. 1187-1206 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Erosion Level-set XFEM Darcy’s law Stokes equations Homogenization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We present in this paper a numerical model of the erosion of a soil that accounts for both the flow in the open fluid and the flow of fluid through the porous soil. The interface between the open fluid and the soil is represented using a level-set function, and the erosion is controlled by the shear stress vector. The evaluation of the approximate value of this gradient is particularly focused on, and an improved method, called XFE+ method, is presented. Numerical results in 2D and 3D illustrate the accuracy and the potentiality of this method. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16707 [article] Numerical modeling of erosion using an improvement of the extended finite element method = Modélisation numérique de l'érosion avec une amélioration de la méthode des éléments finis étendus [texte imprimé] / Cottereau, Régis, Auteur ; Pedro Diez, Auteur . - 2012 . - pp. 1187-1206. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 8 (Août 2011) . - pp. 1187-1206 Mots-clés : Erosion Level-set XFEM Darcy’s law Stokes equations Homogenization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We present in this paper a numerical model of the erosion of a soil that accounts for both the flow in the open fluid and the flow of fluid through the porous soil. The interface between the open fluid and the soil is represented using a level-set function, and the erosion is controlled by the shear stress vector. The evaluation of the approximate value of this gradient is particularly focused on, and an improved method, called XFE+ method, is presented. Numerical results in 2D and 3D illustrate the accuracy and the potentiality of this method. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16707

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Simple formulas for the dynamic stiffness of pile groups / Taherzadeh, Reza in Earthquake engineering structural dynamics, Vol. 38 N° 15 (Décembre 2009)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 38 N° 15 (Décembre 2009) . - pp. 1665-1685 Titre : Simple formulas for the dynamic stiffness of pile groups Type de document : texte imprimé Auteurs : Taherzadeh, Reza, Auteur ; Clouteau, Didier, Auteur ; Cottereau, Régis, Auteur Article en page(s) : pp. 1665-1685 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Soil impedance matrix  Pile foundation  Design formulas  Lumped-parameter models  Hiden variables models Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Simple formulas are derived for the dynamic stiffness of pile group foundations subjected to horizontal and rocking dynamic loads. The formulations are based on the construction of a general model of impedance matrices as the condensation of matrices of mass, damping, and stiffness, and on the identification of the values of these matrices on an extensive database of numerical experiments computed using coupled finite element-boundary element models. The formulations obtained can be readily used for the design of both floating piles on homogeneous half-space and end-bearing piles and are applicable for a wide range of mechanical and geometrical parameters of the soil and piles, in particular for large pile groups. For the seismic design of a building, the use of the simple formulas rather than a full computational model is shown to induce little error on the evaluation of the response spectra and time histories. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Simple formulas for the dynamic stiffness of pile groups [texte imprimé] / Taherzadeh, Reza, Auteur ; Clouteau, Didier, Auteur ; Cottereau, Régis, Auteur . - pp. 1665-1685. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 15 (Décembre 2009) . - pp. 1665-1685 Mots-clés : Soil impedance matrix  Pile foundation  Design formulas  Lumped-parameter models  Hiden variables models Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Simple formulas are derived for the dynamic stiffness of pile group foundations subjected to horizontal and rocking dynamic loads. The formulations are based on the construction of a general model of impedance matrices as the condensation of matrices of mass, damping, and stiffness, and on the identification of the values of these matrices on an extensive database of numerical experiments computed using coupled finite element-boundary element models. The formulations obtained can be readily used for the design of both floating piles on homogeneous half-space and end-bearing piles and are applicable for a wide range of mechanical and geometrical parameters of the soil and piles, in particular for large pile groups. For the seismic design of a building, the use of the simple formulas rather than a full computational model is shown to induce little error on the evaluation of the response spectra and time histories. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe

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