where φ is the potential and σ is the conductivity tensor. The most common numerical methods used to solve this equation inside a human torso are the finite element method (FEM) [1], [2] and the boundary element method (BEM) [3]-[5]. Both techniques have their relative merits for this problem. The FEM handles the highly anisotropic muscle regions well, while the BEM is more efficient in electri...

the main objective of this article is evaluation of the simplified models which have been developed for analysis and design of liquid storage tanks. the empirical formulas of these models for predicting maximum sloshing wave height (mswh) are obtained from mass spring models (msm). a finite element modeling (fem) tool is used for investigating the behavior the some selected liquid storage tanks...

We present the principles of an algorithm which solves partial diierential equations with an adaptive version of the Finite Element Method (FEM), an approach that is very interesting because of the increasing importance of numerical simulations. The calculations are executed in a distributed way on a net of loosely coupled workstations. The algorithm is based on the principle of recur-sive subs...

This paper deals with the coupled procedure of the boundary element method (BEM) and the finite element method (FEM) for the exterior boundary value problems for the Helmholtz equation. A circle is selected as the common boundary on which the integral equation is set up with Fourier expansion. As a result, the exterior problems are transformed into nonlocal boundary value problems in a bounded ...

Model reduction techniques seek approximate solutions of a problem with a large number of DOFs within a subspace of small dimension. Component Mode Synthesis (CMS) methods form a large class of reduction methods where the subspace is selected a priori. Introducing a posteriori error estimation and iterative correction significantly extends the range of applications of reduction methods. The pap...

Building up a time-dependent FEM model the user has to master huge amounts of data inside and outside of the FEM model. For common groundwater modeling projects the time-dependent data that should be included into the FEM model has to be stored „outside“ in database or GIS systems in form of time varying functions applied to point, line or polygon features or in form of areal distributions of t...

Efficient and reliable models for semiconductor distributed feedback (DFB) lasers design and optimization are highly desirable. An innovative dynamic model for accurate simulations of DFB lasers is proposed in this paper. The developed algorithm is based on a system of coupled partial differential equations which is solved by the finite element method (FEM). No approximation is assumed and obta...