Search Results - subject:"finite element"

On discrete maximum principles for nonlinear elliptic problems

Karátson, János; Korotov, Sergey; Křížek, Michal - In: Mathematics and Computers in Simulation (MATCOM) 76 (2007) 1, pp. 99-108

counterparts of the maximum principle (called discrete maximum principles, DMPs), mainly in the framework of the finite element …

Persistent link: https://www.econbiz.de/10011050777

Implementation of an elastoplastic solver based on the Moreau–Yosida Theorem

Gruber, Peter; Valdman, Jan - In: Mathematics and Computers in Simulation (MATCOM) 76 (2007) 1, pp. 73-81

We discuss a technique for solving elastoplastic problems with hardening. The one time-step elastoplastic problem can be formulated as a convex minimization problem with a continuous but non-smooth objective. We actually show that its objective structure satisfies conditions of the...

Persistent link: https://www.econbiz.de/10011050835

Multiscale algorithm with patches of finite elements

Rezzonico, Vittoria; Lozinski, Alexei; Picasso, Marco; … - In: Mathematics and Computers in Simulation (MATCOM) 76 (2007) 1, pp. 181-187

, singularities, boundary layers and oscillations in localized regions. We start with a coarse finite element discretization with a …

Persistent link: https://www.econbiz.de/10011050933

Numerical solution of a long-term average control problem for singular stochastic processes

Kaczmarek, P.; Kent, S.; Rus, G.; Stockbridge, R.; Wade, B. - In: Mathematical Methods of Operations Research 66 (2007) 3, pp. 451-473

(a Markov chain approximation to the diffusion) and using a finite element method to approximate the stationary density …

Persistent link: https://www.econbiz.de/10010949953

Elasto-plasticity model in structural optimization of composite materials with periodic microstructures

Hoppe, Ronald H.W.; Petrova, Svetozara I. - In: Mathematics and Computers in Simulation (MATCOM) 74 (2007) 6, pp. 468-480

-plasticity model with the von Mises yield criterion. Closest-point return mapping algorithms within the incremental finite element … experiments for the computation of the homogenized coefficients involving adaptive finite element discretizations of the three …

Persistent link: https://www.econbiz.de/10010748979

Numerical solution of KdV–KdV systems of Boussinesq equations

Bona, J.L.; Dougalis, V.A.; Mitsotakis, D.E. - In: Mathematics and Computers in Simulation (MATCOM) 74 (2007) 2, pp. 214-228

Considered here is a Boussinesq system of equations from surface water wave theory. The particular system is one of a class of equations derived and analyzed in recent studies. After a brief review of theoretical aspects of this system, attention is turned to numerical methods for the...

Persistent link: https://www.econbiz.de/10010750134

Modeling transitional plane Couette flow

Lagha, M.; Manneville, P. - In: The European Physical Journal B - Condensed Matter and … 58 (2007) 4, pp. 433-447

The Galerkin method is used to derive a realistic model of plane Couette flow in terms of partial differential equations governing the space-time dependence of the amplitude of a few cross-stream modes. Numerical simulations show that it reproduces the globally sub-critical behavior typical of...

Persistent link: https://www.econbiz.de/10009282825

FINITE ELEMENT SURFACE FITTING FOR BRIDGE MANAGEMENT

CHEN, XIAOJUN; KIMURA, TAKUMA - In: International Journal of Information Technology & … 05 (2006) 04, pp. 671-681

We propose a new finite element surface fitting method which can handle very large databases. This method uses finite … derivatives under some constraints on data. The finite element discretization derives a large scale constrained quadratic program … element discretization to find an approximation of a smooth function which minimizes a sum of data residuals and second …

Persistent link: https://www.econbiz.de/10004971681

Analysis of a short-circuit ring impact problem and design of a new ventilator for a 625kVA generator, using SVL

Oslinger, José L.; Palacios, Jairo A.; Jaramillo, … - In: Mathematics and Computers in Simulation (MATCOM) 71 (2006) 4, pp. 282-289

The necessity of an energy supplier was to solve an impact problem presented at the damper winding ring or short-circuit ring of a 625kVA generator and to redesign a fan for it. The principal restriction was the time. It should be done in 15 calendar days, working with drawings of the machine,...

Persistent link: https://www.econbiz.de/10010870112

Quadratic spline methods for the shallow water equations on the sphere: Collocation

Layton, Anita T.; Christara, Christina C.; Jackson, … - In: Mathematics and Computers in Simulation (MATCOM) 71 (2006) 3, pp. 187-205

In this study, we present numerical methods, based on the optimal quadratic spline collocation (OQSC) methods, for solving the shallow water equations (SWEs) in spherical coordinates. The error associated with quadratic spline interpolation is fourth order locally at certain points and third...

Persistent link: https://www.econbiz.de/10010749744