author = "Zlotnik, Sergio"

Encontrado 43 documentos, página mostrada 1 de 5

Hierarchical x-fem applied to n-phase flow

Description: In this work we proposed an extencion of the level set technique to track any number of free surfaces. This extension is based in a hierarchical ordering of several level set functions. To complete the X–FEM approach, the enrichment via partition of the unity method is also extended. The ridge funct...
Language(s): Inglés

Hierarchical X-FEM for n-phase flow (n > 2)

Description: The eXtended Finite Element Method (X-FEM) has been successfully used in two-phase flow problems involving a moving interface. In order to simulate problems involving more than two phases, the X-FEM has to be further eXtended. The proposed approach is presented in the case of a quasi-static Stokes n...
Language(s): Inglés

Assembling sparse matrices in MATLAB

Description: The assembly of sparse matrices is a key operation in finite element methods. In this study we analyze several factors that may have an influence on the efficiency of the assembly procedure. Different insertion strategies are compared using two metrics: a Cost function (the number of memory movement...
Language(s): Inglés

The subductability of continental lithosphere: the before and after story

Description: The temporal evolution of internal forces in a collision environment controls first-order characteristics such as convergence rate, slab dip, subduction stall, and slab breakoff, amongst others. Foremost among these forces are the positive buoyancy provided by the subduction of felsic continental ma...
Language(s): Inglés

Generalized parametric solutions in Stokes flow

Description: The final publication is available at Springer via https://doi.org/10.1016/j.cma.2017.07.016 , Design optimization and uncertainty quantification, among other applications of industrial interest, require fast or multiple queries of some parametric model. The Proper Generalized Decomposition (PGD) provi...
Language(s): Inglés

An efficient and general approach for implementing thermodynamic phase equilibria information in geophysical and geodynamic studies

Description: We present a flexible, general, and efficient approach for implementing thermodynamic phase equilibria information (in the form of sets of physical parameters) into geophysical and geodynamic studies. The approach is based on Tensor Rank Decomposition methods, which transform the original multidimen...
Language(s): Inglés

Proper generalized decomposition for parameterized Helmholtz problems in heterogeneous and unbounded domains: application to harbor agitation

Description: Solving the Helmholtz equation for a large number of input data in an heterogeneous media and unbounded domain still represents a challenge. This is due to the particular nature of the Helmholtz operator and the sensibility of the solution to small variations of the data. Here a reduced order model ...
Language(s): Inglés

A stable XFEM formulation for multi-phase problems enforcing the accuracy of the fluxes through Lagrange multipliers

Description: When applied to diffusion problems in a multi-phase setup, the popular extended finite element method (XFEM) strategy suffers from an inaccurate representation of the local fluxes in the vicinity of the interface. The XFEM enrichment improves the global quality of the solution but it is not enforcin...
Language(s): Inglés

Enforcing interface flux continuity in enhanced XFEM: stability analysis

Description: XFEM is found to be an efficient approach for solving multiphase problems. , Peer Reviewed
Language(s): Inglés

Proper generalized decomposition solution of the parameterized Helmholtz problem: application to inverse geophysical problems

Description: This is the peer reviewed version of the following article: [Signorini, M., Zlotnik, S., and Díez, P. (2017) Proper generalized decomposition solution of the parameterized Helmholtz problem: application to inverse geophysical problems. Int. J. Numer. Meth. Engng, 109: 1085–1102. doi: 10.1002/nme.531...
Language(s): Inglés

Encontrado 43 documentos, página mostrada 1 de 5

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