# Chapter 2

Boundary Representation

## 2.1 Introduction

The boundary element method can be a versatile method
only if it includes the ability to represent any boundary
in the given class of two-, three- or
axisymmetric three-dimensional space. In general this is
carried out by the facility of defining the
surface as a set of panels, each having the same
characteristic form (or a set of two or three characteristic
forms in more advanced software).
For example a closed
two-dimensional boundary in two dimensions can be represented
by a set of straight lines, as illustrated earlier in Figure 2.1.

Fig 2.1. A general two-dimensional boundary approximated by straight line panels.

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