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Discontinuous Slope
The discontinuous slope is the upstream element of a pair of boundary elements simulating a change in slope. The corresponding downstream element is the discontinuous opening. Both are illustrated in Figure 85. The following constants have to be specified on the line beneath the *FLUID SECTION,TYPE=CHANNEL DISCONTINUOUS SLOPE card:
- the width
-
(Figure 85; if 
the slope is calculated from the
coordinates of the end nodes belonging to the element)
- the length
(Figure 85; if 
the length is calculated from the
coordinates of the end nodes belonging to the element)
- the trapezoid angle
- the grain diameter
for the White-Colebrook law or the Manning
constant 
for the Manning law (in the latter case the user has to specify
the parameter MANNING on the *FLUID SECTION card)
- the number of the upstream reference element
- not used
- the number of the downstream discontinuous opening element
- not used
The length is typically small compared to the length of the adjacent
channel branches. Since storage for 9 items is provided and only 8 entries are
allowed per line, an extra blank line has to be provided for the ninth dummy
item.
Notice that a discontinuous slope element generally has upstream channel elements attached to it. Therefore, it is always mandatory to specify an upstream reference element.
Example files: channel6.
Next: Discontinuous Opening Up: Fluid Section Types: Open Previous: Weir slope Contents guido dhondt 2011-03-26