Browsing by Author "Zlotnik, Sergio"
Now showing items 1-20 of 41
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A high order finite element formulation for the simulation of 3D Magneto-Mechanical problems with application to MRI scanners
(2019)
Conference report
Restricted access - publisher's policyTransient magnetic fields generated by the gradient coils in MRI scanners induce eddy currents in their conducting components, which lead to vibrations, imaging artefacts, noise and the dissipation of heat. Heat dissipation ... -
A Lagrangian–Eulerian finite element algorithm for advection–diffusion–reaction problems with phase change
(2016-03)
Article
Open AccessThis paper presents a particle-based Lagrangian–Eulerian algorithm for the solution of the unsteady advection–diffusion–reaction heat transfer equation with phase change. The algorithm combines a Lagrangian formulation for ... -
A new tool-less layered fracturing technology and its pilot application in deep thick formations
(2016)
Conference report
Restricted access - publisher's policyMulti-layer fracturing technology is challenging because of the risk of packer failure and high cost in the deep thick formation. It depends largely on the effectiveness of packer tools. However, a new degradable fiber ... -
A numerical study on hydraulic fracturing problems via the proper generalized decomposition method
(2020-02-01)
Article
Open AccessThe hydraulic fracturing is a nonlinear, fluid-solid coupling and transient problem, in most cases it is always time-consuming to simulate this process numerically. In recent years, although many numerical methods were ... -
A Proper Generalized Decomposition (PGD) approach to crack propagation in brittle materials: with application to random field material properties
(Springer, 2020-02)
Article
Open AccessUnderstanding the failure of brittle heterogeneous materials is essential in many applications. Heterogeneities in materialproperties are frequently modeled through random fields, which typically induces the need to solve ... -
A reduced order approach for probabilistic inversions of 3-D magnetotelluric data I: general formulation
(2020-12)
Article
Restricted access - publisher's policy -
A stable XFEM formulation for multi-phase problems enforcing the accuracy of the fluxes through Lagrange multipliers
(2013-11-02)
Article
Open AccessWhen 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 ... -
Algebraic PGD for tensor separation and compression: an algorithmic approach
(2018-07)
Article
Open AccessProper Generalized Decomposition (PGD) is devised as a computational method to solve high-dimensional boundary value problems (where many dimensions are associated with the space of parameters defining the problem). The ... -
An efficient and general approach for implementing thermodynamic phase equilibria information in geophysical and geodynamic studies
(2015-10-25)
Article
Open AccessWe 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 ... -
An error estimator for real-time simulators based on model order reduction
(Springer, 2015-11-26)
Article
Open AccessModel order reduction (MOR) is one of the most appealing choices for real-time simulation of non-linear solids. In this work a method is presented in which real time performance is achieved by means of the o -line solution ... -
Assembling sparse matrices in MATLAB
(2010)
Article
Restricted access - publisher's policyThe 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 ... -
Building a certified reduced basis for coupled thermo-hydro-mechanical systems with goal-oriented error estimation
(Springer, 2020-09)
Article
Restricted access - publisher's policyA goal-oriented a-posteriori error estimator is developed for transient coupled thermo-hydro-mechanical (THM) parametric problems solved with a reduced basis approximation. The estimator assesses the error in some specific ... -
Cell-DEVS modeling and simulation of artificial hydraulic fracturing of rocks in boreholes (WIP)
(Society for Computer Simulation International, 2018)
Conference report
Restricted access - publisher's policyHydraulic Fracturing is a technique used in the extraction and exploration of oil and gas. During hydraulic fracturing, a high-pressure fluid is injected into a wellbore; this fluid flows through some artificially made ... -
Controls on subduction reorganization in the Hellenic margin, eastern Mediterranean
(2010)
Article
Open Access -
Coupled mantle dripping and lateral dragging controlling the lithosphere structure of the NW-Moroccan margin and the Atlas Mountains: A numerical experiment
(2014-02-15)
Article
Open AccessRecent studies integrating gravity, geoid, surface heat flow, elevation and seismic data indicate a prominent lithospheric mantle thickening beneath the NW-Moroccan margin (LAB >200 km-depth) followed by thinning beneath ... -
Dynamics of double-polarity subduction: application to the Western Mediterranean
(Barcelona Supercomputing Center, 2015-05-05)
Conference report
Open AccessThe Western Mediterranean tectonic setting and history is studied by means of three-dimensional numerical models. Goals are to understand its dynamics and to test the feasibility of a doublepolarity subduction process ... -
Effect of the separated approximation of input data in the accuracy of the resulting PGD solution
(Springer, 2015-11-25)
Article
Open AccessThe Proper Generalized Decomposition (PGD) requires separability of the input data (e.g. physical properties, source term, boundary conditions, initial state). In many cases the input data is not expressed in a separated ... -
Effect of the separated approximation of input data in the accuracy of the resulting PGD solution
(CIMNE, 2015)
Conference report
Open AccessSeparated representations are commonly used to avoid the so-called curse of dimensionality, that is, an exponential increase in the number of degrees of freedom with the number of dimensions. In order to use separated ... -
Efficiency and accuracy of high-order computations and reduced order modelling in coastal engineering wave propagation problems
(2012)
Conference report
Restricted access - publisher's policySeveral numerical issues have to be considered when solving wave propagation problems, between which there are the artificial boundary conditions, the small geometrical features that can be influential or the variable ... -
Encapsulated PGD algebraic toolbox operating with high-dimensional data
(2019-11-28)
Article
Open AccessIn its original conception, proper generalized decomposition (PGD) provides explicit parametric solutions, denoted as computational vademecums or digital abacuses, to parametric boundary value problems. The PGD approach ...
