Diffusion term

From CFD-Wiki

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
and are position vector of centroids of cells cell 0 and cell 1 respectively.