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## A New Mixed Finite Element Method for Elastodynamics with Weak Symmetry

### Journal of Scientific Computing (2017-09-01) 72: 1049-1079 , September 01, 2017

We provide a new mixed finite element analysis for linear elastodynamics with reduced symmetry. The problem is formulated as a second order system in time by imposing only the Cauchy stress tensor and the rotation as primary and secondary variables, respectively. We prove that the resulting variational formulation is well-posed and provide a convergence analysis for a class of $${\mathrm {H}}(\mathop {{\mathrm {div}}}\nolimits )$$ -conforming semi-discrete schemes. In addition, we use the Newmark trapezoidal rule to obtain a fully discrete version of the problem and carry out the corresponding convergence analysis. Finally, numerical tests illustrating the performance of the fully discrete scheme are presented.

## Theory and Application of Characteristic Finite Element Domain Decomposition Procedures for Coupled System of Dynamics of Fluids in Porous Media

### Acta Mathematicae Applicatae Sinica, English Series (2007-04-01) 23: 255-268 , April 01, 2007

###
*Abstract*

For a coupled system of multiplayer dynamics of fluids in porous media, the characteristic finite element domain decomposition procedures applicable to parallel arithmetic are put forward. Techniques such as calculus of variations, domain decomposition, characteristic method, negative norm estimate, energy method and the theory of prior estimates are adopted. Optimal order estimates in L^{2} norm are derived for the error in the approximate solution.

## A fictitious domain approach with Lagrange multiplier for fluid-structure interactions

### Numerische Mathematik (2017-03-01) 135: 711-732 , March 01, 2017

We study a recently introduced formulation for fluid-structure interaction problems which makes use of a distributed Lagrange multiplier in the spirit of the fictitious domain method. The time discretization of the problem leads to a mixed problem for which a rigorous stability analysis is provided. The finite element space discretization is discussed and optimal convergence estimates are proved.

## Isoparametric C 0 interior penalty methods for plate bending problems on smooth domains

### Calcolo (2013-03-01) 50: 35-67 , March 01, 2013

In this paper we develop isoparametric *C*^{0} interior penalty methods for plate bending problems on smooth domains. The orders of convergence of these methods are shown to be optimal in the energy norm. We also consider the convergence of these methods in lower order Sobolev norms and discuss subparametric *C*^{0} interior penalty methods. Numerical results that illustrate the performance of these methods are presented.

## Two-grid partition of unity method for second order elliptic problems

### Applied Mathematics and Mechanics (2008-04-01) 29: 527-533 , April 01, 2008

A two-grid partition of unity method for second order elliptic problems is proposed and analyzed. The standard two-grid method is a local and parallel method usually leading to a discontinuous solution in the entire computational domain. Partition of unity method is employed to glue all the local solutions together to get the global continuous one, which is optimal in *H*^{1}-norm. Furthermore, it is shown that the *L*^{2} error can be improved by using the coarse grid correction. Numerical experiments are reported to support the theoretical results.

## Interpolation error estimates for mean value coordinates over convex polygons

### Advances in Computational Mathematics (2013-08-01) 39: 327-347 , August 01, 2013

In a similar fashion to estimates shown for Harmonic, Wachspress, and Sibson coordinates in Gillette et al. (Adv Comput Math 37(3), 417–439, 2012), we prove interpolation error estimates for the mean value coordinates on convex polygons suitable for standard finite element analysis. Our analysis is based on providing a uniform bound on the gradient of the mean value functions for all convex polygons of diameter one satisfying certain simple geometric restrictions. This work makes rigorous an observed practical advantage of the mean value coordinates: unlike Wachspress coordinates, the gradients of the mean value coordinates do not become large as interior angles of the polygon approach *π*.

## An adaptive residual local projection finite element method for the Navier–Stokes equations

### Advances in Computational Mathematics (2014-12-01) 40: 1093-1119 , December 01, 2014

This work proposes and analyses an adaptive finite element scheme for the fully non-linear incompressible Navier-Stokes equations. A residual a posteriori error estimator is shown to be effective and reliable. The error estimator relies on a Residual Local Projection (RELP) finite element method for which we prove well-posedness under mild conditions. Several well-established numerical tests assess the theoretical results.

## An efficient and reliable residual-type a posteriori error estimator for the Signorini problem

### Numerische Mathematik (2015-05-01) 130: 151-197 , May 01, 2015

We derive a new a posteriori error estimator for the Signorini problem. It generalizes the standard residual-type estimators for unconstrained problems in linear elasticity by additional terms at the contact boundary addressing the non-linearity. Remarkably these additional contact-related terms vanish in the case of so-called full-contact. We prove reliability and efficiency for two- and three-dimensional simplicial meshes. Moreover, we address the case of non-discrete gap functions. Numerical tests for different obstacles and starting grids illustrate the good performance of the a posteriori error estimator in the two- and three-dimensional case, for simplicial as well as for unstructured mixed meshes.

## Pointwise estimates of SDFEM on Shishkin triangular meshes for problems with exponential layers

### BIT Numerical Mathematics (2017-05-08): 1-26 , May 08, 2017

In this paper, we present a pointwise convergence analysis for a streamline diffusion finite element method (SDFEM) on a Shishkin triangular mesh. We prove that the method is uniformly convergent with a pointwise accuracy of order almost 7/4 (up to a logarithmic factor) away from the subdomain where the layers intersect. Finally, numerical experiments support our theoretical results.

## Anisotropic nonconforming Crouzeix-Raviart type FEM for second-order elliptic problems

### Applied Mathematics and Mechanics (2012-02-01) 33: 243-252 , February 01, 2012

The nonconforming Crouzeix-Raviart type linear triangular finite element approximate to second-order elliptic problems is studied on anisotropic general triangular meshes in 2D satisfying the maximal angle condition and the coordinate system condition. The optimal-order error estimates of the broken energy norm and *L*^{2}-norm are obtained.