Now showing items 1-20 of 197

• #### 5-axis double-flank CNC machining of spiral bevel gears via custom-shaped milling tools -- Part I: modeling and simulation ﻿

(Precision Engineering, 2019-11-20)
A new category of 5-axis flank computer numerically controlled (CNC) machining, called \emph{double-flank}, is presented. Instead of using a predefined set of milling tools, we use the shape of the milling tool as a free ...
• #### A Bochev-Dohrmann-Gunzburger stabilization method for the primitive equations of the ocean ﻿

(Applied Mathematics Letters, 2013-12-31)
We introduce a low-order stabilized discretization of the primitive equations of the ocean with highly reduced computational complexity. We prove stability through a specific inf-sup condition, and weak convergence to a ...
• #### A Geometric Toolbox for Tetrahedral Finite Element Partitions ﻿

(Efficient Preconditioned Solution Methods for Elliptic Partial Differential Equations, 2011-12-31)
In this work we present a survey of some geometric results on tetrahedral partitions and their refinements in a unified manner. They can be used for mesh generation and adaptivity in practical calculations by the finite ...
• #### A hybrid method for inversion of 3D DC resistivity logging measurements ﻿

(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 ...
• #### A modified discontinuous Galerkin method for solving efficiently Helmholtz problems ﻿

(Communications in Computational Physics, 2012-12-31)
A new solution methodology is proposed for solving efficiently Helmholtz problems. The proposed method falls in the category of the discontinuous Galerkin methods. However, unlike the existing solution methodologies, this ...
• #### A Non-uniform Staggered Cartesian Grid approach for Lattice-Boltzmann method ﻿

(Procedia Computer Science, 2015-12-31)
We propose a numerical approach based on the Lattice-Boltzmann method (LBM) for dealing with mesh refinement of Non-uniform Staggered Cartesian Grid. We explain, in detail, the strategy for mapping LBM over such geometries. ...
• #### A posteriori error analysis of a stabilized mixed FEM for convectuion-diffusion problems ﻿

(AIMS Proceedings, 2015, 2015-12-31)
We present an augmented dual-mixed variational formulation for a linear convection-diffusion equation with homogeneous Dirichlet boundary conditions. The approach is based on the addition of suitable least squares type ...
• #### A posteriori error analysis of an augmented mixed finite element method for Darcy flow ﻿

(Computer Methods in Applied Mechanics and Engineering, 2015-12-31)
We develop an a posteriori error analysis of residual type of a stabilized mixed finite element method for Darcy flow. The stabilized formulation is obtained by adding to the standard dual-mixed approach suitable residual ...
• #### A Secondary Field Based hp-Finite Element Method for the Simulation of Magnetotelluric Measurements ﻿

(Journal of Computational Science, 2015-12-31)
In some geophysical problems, it is sometimes possible to divide the subsurface resistivity distribution as a one dimensional (1D) contribution plus some two dimensional (2D) inhomogeneities. Assuming this scenario, we ...
• #### A stable discontinuous Galerkin-type method for solving efficiently Helmholtz problems ﻿

(Computers and Structures, 2012-12-31)
We propose a stable discontinuous Galerkin-type method (SDGM) for solving efficiently Helmholtz problems. This mixed-hybrid formulation is a two-step procedure. Step 1 consists in solving well-posed problems at the element ...
• #### A study of the apsidal angle and a proof of monotonicity in the logarithmic potential case ﻿

(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 ...
• #### A two-level finite element discretization of the streamfunction formulation of the stationary quasi-geostrophic equations of the ocean ﻿

(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 ...
• #### A variational finite element model for large-eddy simulations of turbulent flows ﻿

(Chinese Annals of Mathematics. Series B, 2013-12-31)
The authors introduce a new Large Eddy Simulation model in a channel, based on the projection on finite element spaces as filtering operation in its variational form, for a given triangulation {T h}h&gt;0. The eddy viscosity ...
• #### Accelerating fluid-solid simulations (Lattice-Boltzmann & Immersed-Boundary) on heterogeneous architectures ﻿

(Journal of Computational Science, 2015-12-31)
We propose a numerical approach based on the Lattice-Boltzmann (LBM) and Immersed Boundary (IB) methods to tackle the problem of the interaction of solids with an incompressible fluid flow, and its implementation on ...
• #### Accessibility for Line-Cutting in Freeform Surfaces ﻿

(Computer-Aided Design, 2019-04-26)
Manufacturing techniques such as hot-wire cutting, wire-EDM, wire-saw cutting, and flank CNC machining all belong to a class of processes called line-cutting where the cutting tool moves tangentially along the reference ...
• #### Adaptive Direct FEM Simulation with Unicorn/FEniCS-HPC for CS1 ﻿

(5th International Workshop on High Order CFD Methods, 2018-01-01)
• #### Adaptive simulation of unsteady flow past the submerged part of a floating wind turbine platform ﻿

(MARINE 2015 - Computational Methods in Marine Engineering VI, 2015-12-31)
Offshore floating platforms for wind turbines represent challenging concepts for designers trying to combine an optimal compromise between cost effectiveness and performance. Modelling of the hydrodynamic behaviour of the ...
• #### Adjoint-based formulation for computing derivatives with respect to bed boundary positions in resistivity geophysics ﻿

(Computational Geosciences, 2019-02)
In inverse geophysical resistivity problems, it is common to optimize for specific resistivity values and bed boundary positions, as needed, for example, in geosteering applications. When using gradient-based inversion ...
• #### Aerodynamic study of a tricycle wheel subsystem for drag reduction ﻿

(Journal of Fluids Engineering, 2014-12-31)
This paper deals with a computational fluid dynamics (CFD) and experimental drag analysis on an isolated rotating wheel subsystem (including its accessories: tire, suspension, A-arms, and fender) of a motor tricycle vehicle ...
• #### An Agent-Oriented Hierarchic Strategy for Solving Inverse Problems ﻿

(International Journal of Applied Mathematics and Computer Science, 2015-12-31)
The paper discusses the complex, agent-oriented hierarchic memetic strategy (HMS) dedicated to solving inverse parametric problems. The strategy goes beyond the idea of two-phase global optimization algorithms. The global ...