# Diffusion term

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[[Image:Nm_descretisation_diffusionterms_01.jpg]]
[[Image:Nm_descretisation_diffusionterms_01.jpg]]
- Figure 1.1
+ '''Figure 1.1'''
$\vec r_{0}$ and $\vec r_{1}$ are position vector of centroids of cells cell 0 and cell 1 respectively.
$\vec r_{0}$ and $\vec r_{1}$ are position vector of centroids of cells cell 0 and cell 1 respectively.
${\rm{d\vec s}} = \vec r_{1} - \vec r_{0}$ ${\rm{d\vec s}} = \vec r_{1} - \vec r_{0}$

## Discretisation of Diffusive Term

### 1. Description

A control volume in mesh is made up of set of faces enclosing it. The figure 1.1 shows a typical situation. Where A represent the magnitude of area of the face. And n represents the normal unit vector of the face under consideration.

Figure 1.1
$\vec r_{0}$ and $\vec r_{1}$ are position vector of centroids of cells cell 0 and cell 1 respectively.
${\rm{d\vec s}} = \vec r_{1} - \vec r_{0}$