 
 
 
 
 
 
 
  
The discontinuous opening is the downstream element of the boundary element pair defining a change in channel slope. The following constants have to be specified on the line beneath the *FLUID SECTION,TYPE=CHANNEL DISCONTINUOUS OPENING card:
 
 (Figure 107; if
 (Figure 107; if  the slope is calculated from the
  coordinates of the end nodes belonging to the element)
 the slope is calculated from the
  coordinates of the end nodes belonging to the element)
 (Figure 107; if
 (Figure 107; if  the length is calculated from the
  coordinates of the end nodes belonging to the element)
 the length is calculated from the
  coordinates of the end nodes belonging to the element)
 
 for the White-Colebrook law or the Manning
  constant
 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)
 for the Manning law (in the latter case the user has to specify
  the parameter MANNING on the *FLUID SECTION card)
The length  is typically small compared to the length of the adjacent
channel branches.
 is typically small compared to the length of the adjacent
channel branches.
Example files: channel6.