# Diffusion term

(Difference between revisions)
 Revision as of 22:20, 14 September 2005 (view source)Zxaar (Talk | contribs)← Older edit Revision as of 22:25, 14 September 2005 (view source)Zxaar (Talk | contribs) Newer edit → Line 4: Line 4: 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. 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.

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

## 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.
${\rm{d\vec s}} = \vec r_{1} - \vec r_{0}$