Personne
Annalisa Buffa
Publications associées (72)
An a posteriori error estimator for isogeometric analysis on trimmed geometries
Annalisa Buffa, Rafael Vazquez Hernandez, Ondine Gabrielle Chanon
Trimming consists of cutting away parts of a geometric domain, without reconstructing a global parametrization (meshing). It is a widely used operation in computer-aided design, which generates meshes that are unfitted with the described physical object. T ...
2022Reduced order modelling of nonaffine problems on parameterized NURBS multipatch geometries
Annalisa Buffa, Pablo Antolin Sanchez, Margarita Chasapi
This contribution explores the combined capabilities of reduced basis methods and IsoGeometric Analysis (IGA) in the context of parameterized partial differential equations. The introduction of IGA enables a unified simulation framework based on a single g ...
2022A mathematical theory for mass lumping and its generalization with applications to isogeometric analysis
Annalisa Buffa, Espen Sande, Yannis Dirk Voet
Explicit time integration schemes coupled with Galerkin discretizations of time-dependent partial differential equations require solving a linear system with the mass matrix at each time step. For applications in structural dynamics, the solution of the li ...
2022An unrefinement algorithm for planar THB-spline parameterizations
Unrefinement is a tool that allows to perform faster numerical simulations by controlling the level of precision in the specified area. We introduce an algorithm that creates a coarser geometry from an initial regular geometry, which is represented with re ...
ELSEVIER2022A localized reduced basis approach for unfitted domain methods on parameterized geometries
Annalisa Buffa, Pablo Antolin Sanchez, Margarita Chasapi
This work introduces a reduced order modeling (ROM) framework for the solution of parameterized second-order linear elliptic partial differential equations formulated on unfitted geometries. The goal is to construct efficient projection-based ROMs, which r ...
2022Adaptive analysis-aware defeaturing
Annalisa Buffa, Rafael Vazquez Hernandez, Ondine Gabrielle Chanon
Removing geometrical details from a complex domain is a classical operation in computer aided design for simulation and manufacturing. This procedure simplifies the meshing process, and it enables faster simulations with less memory requirements. But depen ...
2022MATHICSE Technical Report : Analysis-aware defeaturing: problem setting and a posteriori estimation
Annalisa Buffa, Rafael Vazquez Hernandez, Ondine Gabrielle Chanon
Defeaturing consists in simplifying geometrical models by removing the geometrical features that are considered not relevant for a given simulation. Feature removal and simplification of computer-aided design models enables faster simulations for engineeri ...
EPFL2021Overlapping Multipatch Isogeometric Method With Minimal Stabilization
Annalisa Buffa, Pablo Antolin Sanchez, Xiaodong Wei, Riccardo Puppi
We present a novel method for isogeometric analysis (IGA) to directly work on geometries constructed by Boolean operations including difference (i.e., trimming), union, and intersection. Particularly, this work focuses on the union operation, which involve ...
SIAM PUBLICATIONS2021Remarks on Poincare and interpolation estimates for Truncated Hierarchical B-splines
This paper should be considered as an addendum to [A. Buffa and C. Giannelli, Adaptive isogeometric methods with hierarchical splines: Error estimator and convergence, Math. Models Methods Appl. Sci. 26 (2016) 1-25] and [A. Buffa and C. Giannelli, Adaptive ...
2021MATHICSE Technical Report : Mathematical Foundations of Adaptive Isogeometric Analysis
Annalisa Buffa, Rafael Vazquez Hernandez
This paper reviews the state of the art and discusses recent developments in the field of adaptive isogeometric analysis, with special focus on the mathematical theory. This includes an overview of available spline technologies for the local resolution of ...
EPFL2021