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### Enlargement

Figure 109: Geometry of an enlargement

The geometry of an enlargement is shown in Figure 109 (view from above). Although an enlargement is really a discontinuity, a small fictitious length an a slope have to be assigned. For the slope one can take the mean values of the slopes of the adjacent channels. The following constants have to be specified on the line beneath the *FLUID SECTION,TYPE=CHANNEL ENLARGEMENT card:

- the upstream width
- the slope (if zero is taken)
- the length (if the length is calculated from the coordinates of the end nodes belonging to the element)
- the downstream width

Example files: channel9, channel11.