This is a straight pipe with constant section and head losses
defined by the
Manning formula:
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(14) |
where n is the Manning coefficient (unit:
time length
),
is the mass flux, L is the length of the
pipe,
is the liquid density, A is the cross section of the pipe
and
is the hydraulic radius defined by the area of the cross
section divided by its circumference (for a circle the hydraulic radius is one
fourth of the diameter). The following constants have to be specified on the
line beneath the *FLUID SECTION, TYPE=PIPE MANNING card):
The length of the pipe is determined from the coordinates of its end
nodes. Typical values for are
s
m
for steel
pipes and
s
m
for smooth concrete pipes.