نتایج جستجو برای: unstructured problems

تعداد نتایج: 597593  

1999
Mark Adams

Multigrid is a popular solution method for the set of linear algebraic equations that arise from PDEs discretized with the nite element method. The application of multigrid to unstructured grid problems, however, is not well developed. We discuss a method, that uses many of the same techniques as the nite element method itself, to apply standard multigrid algorithms to unstructured nite element...

Journal: :SIAM Journal on Numerical Analysis 2021

Related DatabasesWeb of Science You must be logged in with an active subscription to view this.Article DataHistorySubmitted: 3 September 2020Accepted: 05 January 2021Published online: 21 April 2021Keywordsmultiscale method, numerical homogenization, high-order methodAMS Subject Headings65N12, 65N30Publication DataISSN (print): 0036-1429ISSN (online): 1095-7170Publisher: Society for Industrial a...

2016
Harshavardhana Srinivasan Panagiotis Tsoutsanis

This paper demonstrates the capabilities of Adaptive Mesh Refinement Techniques (AMR) on 2D hybrid unstructured meshes, for high order finite volume WENO methods. The AMR technique developed is a conformal adapting unstructured hybrid quadrilaterals and triangles (quads & tris) technique for resolving sharp flow features in accurate manner for steady-state and time dependent flow problems. In t...

2009
Dov Katz Oliver Brock

We propose factorization as a concept to analyze and solve manipulation problems in unstructured environments. A factorization is a decomposition of the original problem into factors (sub-problems), each of which can be solved much more easily than the original problem. The appropriate composition of these factors results in a robust and efficient solution to the original problem. Our assumptio...

1999
Mark Adams

Multigrid is a popular solution method for the set of linear algebraic equations that arise from PDEs discretized with the nite element method. The application of multigrid to unstructured grid problems, however, is not well developed. We discuss a method that uses many of the same techniques as the nite element method itself, to apply standard multigrid algorithms to unstructured nite element ...

2014
M. Hemalatha

The organization of unstructured data is recognized as one of the major uncertain problems in the information industry and data mining paradigm. It will be in the form of computerized information that moreover, does not have a data model and there are not simply used by data mining. The task of managing unstructured data signifies possibly the major data management opportunity for our community...

Journal: :IEEE Trans. Automat. Contr. 2005
Kunpeng Sun Andrew Packard

In this paper, the robust H2 and H∞ filter design problems are considered, where the uncertainties, unstructured or structured, are norm bounded and represented by linear fractional transformation (LFT). The main result is that after upper-bounding the objectives, the problems of minimizing the upper bounds are converted to finite dimensional convex optimization problems involving linear matrix...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بوعلی سینا - دانشکده علوم پایه 1391

abstract: in this thesis, we focus to class of convex optimization problem whose objective function is given as a linear function and a convex function of a linear transformation of the decision variables and whose feasible region is a polytope. we show that there exists an optimal solution to this class of problems on a face of the constraint polytope of feasible region. based on this, we dev...

2013
Safique Ahmad Volker Mehrmann

Minimal structured perturbations are constructed such that an approximate eigenpair of a nonlinear eigenvalue problem in homogeneous form is an exact eigenpair of an appropriately perturbed nonlinear matrix function. Structured and unstructured backward errors are compared. These results extend previous results for (structured) matrix polynomials to more general functions. Structured and unstru...

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