## Search

Now showing items 1-10 of 21

#### Explicit-in-Time Goal-Oriented Adaptivity

(Computer Methods in Applied Mechanics and Engineering, 2019-04-15)

Goal-oriented adaptivity is a powerful tool to accurately approximate physically relevant solution features for partial differential equations. In time dependent problems, we seek to represent the error in the quantity of ...

#### Fast 2.5D Finite Element Simulations of Borehole Resistivity Measurements

(Computational Geosciences, 2018-05-29)

We develop a rapid 2.5-dimensional (2.5D) finite element method for simulation of borehole resistivity measurements in transversely isotropic (TI) media. The method combines arbitrary high-order $H^1$ - and $H$ (curl)-conforming ...

#### A multi-domain decomposition-based Fourier finite element method for the simulation of 3D marine CSEM measurements

(Computational Geosciences, 2017-01-01)

We introduce a multi-domain decomposition Fourier finite element (MDDFFE) method for the simulation of three-dimensional (3D) marine controlled source electromagnetic measurement (CSEM). The method combines a 2D finite ...

#### On the maximum angle condition for the conforming longest-edge n-section algorithm for large values of n

(Computer Aided Geometric Design, 2015-12-31)

In this note we introduce the conforming longest-edge $n$-section algorithm and show that for $n \ge 4$ it produces a family of triangulations which does not satisfy the maximum angle condition.

#### Quantities of interest for surface based resistivity geophysical measurements

(Procedia Computer Science, 2015-12-31)

The objective of traditional goal-oriented strategies is to construct an optimal mesh that minimizes the problem size needed to achieve a user prescribed tolerance error for a given quantity of interest (QoI). Typical ...

#### Direct solvers performance on h-adapted grids

(Computers and Mathematics with Applications, 2015-12-31)

We analyse the performance of direct solvers when applied to a system of linear equations arising from an $h$-adapted, $C^0$ finite element space. Theoretical estimates are derived for typical $h$-refinement patterns arising ...

#### Some discrete maximum principles arising for nonlinear elliptic finite element problems

(Computers and Mathematics with Applications, 2015-12-31)

The discrete maximum principle (DMP) is an important measure of the qualitative reliability of the applied numerical scheme for elliptic problems. This paper starts with formulating simple sufficient conditions for the ...

#### Towards a parameter-free method for high Reynolds number turbulent flow simulation based on adaptive finite element approximation

(Computer Methods in Applied Mechanics and Engineering, 2015-05-01)

This article is a review of our work towards a parameter-free method for simulation of turbulent flow at high Reynolds numbers. In a series of papers we have developed a model for turbulent flow in the form of weak solutions ...

#### Red refinements of simplices into congruent subsimplices

(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 ...

#### On numerical regularity of the face-to-face longest-edge bisection algorithm for tetrahedral partitions

(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 ...