Now showing items 41-60 of 219

• #### Computational fixed-point theory for differential delay equations with multiple time lags ﻿

(SIAM Journal on Numerical Analysis, 2013-12-31)
We present an efficient rigorous computational method which is an extension of the work Analytic Estimates and Rigorous Continuation for Equilibria of Higher-Dimensional PDEs (M. Gameiro and J.-P. Lessard, J. Differential ...
• #### Sensitivity study of borehole-to-surface and crosswell electromagnetic measurements acquired with energized steel casing to water displacement in hydrocarbon-bearing layers ﻿

(Central European Journal of Mathematics, 2013-12-31)
[No abstract available]
• #### Automatic Red-Channel underwater image restoration ﻿

(19th AIAA/CEAS Aeroacoustics Conference, 2013-12-31)
This is a summary of preliminary results from simulations with the 30P30N high-lift device. We used the General Galerkin finite element method (G2), where no explicit subgrid model is used, and where the computational mesh ...
• #### Numerical investigation of the aerodynamic performance for a wells-type turbine in a wave energy converter ﻿

(Computers and Mathematics with Applications, 2013-12-31)
In this paper we proposed a two-level finite element discretization of the nonlinear stationary quasi-geostrophic equations, which model the wind driven large scale ocean circulation. Optimal error estimates for the two-level ...
• #### Goal-oriented adaptivity using unconventional error representations for the 1D Helmholtz equation ﻿

(19th AIAA/CEAS Aeroacoustics Conference, 2013-12-31)
We report the latest results obtained in the development of an adaptive finite element method for computational aeroacoustics (CAA). The new methodology is based on the General Galerkin (G2) method, which has been successfully ...
• #### Analysis of extreme wave events on the southern coast of Brazil ﻿

(Proceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition; Dusseldorf, Germany, June 16-20 2014", 2014-12-31)
This paper deals with the simulation of steady flows in tur- bomachinery. Two approaches are proposed, the first one is the classical multiple-rotating frame method (MRF) by multi- zone approach where the different zones ...
• #### Identification of defects originated during the filling of cast pieces through particles modelling ﻿

(IOP Conference Series: Materials Science and Engineering, 2014-12-31)
In the first part of the paper we present the multi-scale simulation of the Step-and-Flash Imprint Lithography (SFIL), a modern patterning process. The simulation utilizes the hp adaptive Finite Element Method (hp-FEM) ...
• #### The Modellers' Halting Foray into Ecological Theory: Or, What is This Thing Called 'Growth Rate'? ﻿

(Natural Hazards and Earth System Sciences, 2014-12-31)
Using the wave model SWAN (simulating waves nearshore), high waves on the southwestern Atlantic generated by extra-tropical cyclones are simulated from 2000 to 2010, and their impact on the Rio Grande do Sul (RS) coast is ...
• #### A two-level finite element discretization of the streamfunction formulation of the stationary quasi-geostrophic equations of the ocean ﻿

(Journal of Mathematical Analysis and Applications, 2014-12-31)
This paper concerns the behaviour of the apsidal angle for orbits of central force system with homogeneous potential of degree $-2 \le \alpha \le 1$ and logarithmic potential. We derive a formula for the apsidal angle as ...
• #### Discontinuous high-order finite-volume/finite-element method for inviscid compressible flows ﻿

(52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014, 2014-12-31)
We present a time-resolved, adaptive finite element method for aerodynamics, together with the results from the HiLiftPW-2 workshop, where this method is used to compute the ow past a DLR-F11 aircraft model at realistic ...
• #### Stabilized dual-mixed method for the problem of linear elasticity with mixed boundary conditions ﻿

(Computers and Mathematics with Applications, 2014-12-31)
We show that in dimensions higher than two, the popular "red refinement" technique, commonly used for simplicial mesh refinements and adaptivity in the finite element analysis and practice, never yields subsimplices which ...
• #### A hybrid method for inversion of 3D DC resistivity logging measurements ﻿

(Science of Computer Programming, 2014-12-31)
The finite element method usually requires regular or strongly regular families of partitions in order to get guaranteed a priori or a posteriori error estimates. In this paper we examine the recently invented longest-edge ...
• #### On nonobtuse refinements of tetrahedral finite element meshes ﻿

(11th World Congress on Computational Mechanics, WCCM 2014, 5th European Conference on Computational Mechanics, ECCM 2014 and 6th European Conference on Computational Fluid Dynamics, ECFD 2014, 2014-12-31)
The proposed method naturally merges the desirable conservative properties and intuitive physical formulation of the widely used finite-volume (FV) technique, with the capability of local arbitrary high-order accuracy and ...
• #### A Bochev-Dohrmann-Gunzburger stabilization method for the primitive equations of the ocean ﻿

(Applied Mathematics Letters, 2014-12-31)
We extend the applicability of the augmented dual-mixed method introduced recently in Gatica (2007), Gatica et al. (2009) to the problem of linear elasticity with mixed boundary conditions. The method is based on the ...
• #### Unstructured, curved elements for the two-dimensional high order discontinuous control-volume/finite-element method ﻿

(Natural Computing, 2014-12-31)
This paper focuses on the application of hp hierarchic genetic strategy (hp-HGS) for solution of a challenging problem, the inversion of 3D direct current (DC) resistivity logging measurements. The problem under consideration ...
• #### On numerical regularity of the face-to-face longest-edge bisection algorithm for tetrahedral partitions ﻿

(International Journal for Numerical Methods in Engineering, 2014-12-31)
Quadrilateral and triangular elements with curved edges are developed in the framework of spectral, discontinuous, hybrid control-volume/finite-element method for elliptic problems. In order to accommodate hybrid meshes, ...
• #### One-dimensional chaos in a system with dry friction: analytical approach ﻿

(Applied Numerical Mathematics, 2014-12-31)
We consider an augmented mixed finite element method applied to the linear elasticity problem and derive a posteriori error estimators that are simpler and easier to implement than the ones available in the literature. In ...
• #### A Non-uniform Staggered Cartesian Grid approach for Lattice-Boltzmann method ﻿

(11th World Congress on Computational Mechanics, WCCM 2014, 5th European Conference on Computational Mechanics, ECCM 2014 and 6th European Conference on Computational Fluid Dynamics, ECFD 2014, 2014-12-31)
In casting processes, strong recirculation zones may trap air, gases and strip particles of sand off the mold affecting seriously the quality of the cast pieces. Especially during the filling of molten pieces with large ...
• #### Towards the development of adaptive finite element methods for internal flow aeroacoustics ﻿

(Proceedings of International Conference MASCOT2012 / ISGG2012, Las Palmas, Spain, 2014, 2014-12-31)
It is known that piecewise linear continuous finite element (FE) approximations on nonobtuse tetrahedral FE meshes guarantee the validity of discrete analogues of various maximum principles for a wide class of elliptic ...
• #### Non-conforming curved finite element schemes for time-dependent elastic-acoustic coupled problems ﻿

(Computers and Mathematics with Applications, 2014-12-31)
In this paper we present computational cost estimates for parallel shared memory isogeometric multi-frontal solvers. The estimates show that the ideal isogeometric shared memory parallel direct solver scales as \$\mathcal{O}( ...