Fluids
Lab1
Lecture
Mud
(42
respondents)
1.
Why
is
it
that
p
o
is
constant
along
a
streamline?
(1
student)
We
can
conclude
this
from
the
equations
of
motion
(F=ma)
for
a
ﬂuid,
after
some
algebra
and
calculus
work.
We
will
get
to
this
later
in
the
course.
For
the
purposes
of
the
upcoming
Lab,
we
ask
you
to
take
it
on
faith
for
now.
And
the
class
tunnel
demo
experimentally
showed
that
p
o
is
indeed
constant.
2.
What
are
V
and
p
as
opposed
to
V
and
p
?
(6
students)
The
subscript
()
indicates
a
quantity
“at
in±nity”,
in
the
mathematicallimit
sense.
So
the
pressure
±eld
p
(
x,
y,
z
)
near
the
wing
asymptotes
to
p
as
we
move
farther
and
farther
away.
Likewise
for
V
(
x,
y,
z
)
and
V
.
In
practice,
the
pressure
±eld
asymptotes
very
quickly,
so
we
don’t
have
to
move
very
far
from
the
wing
to
get
very
close
to
p
.
Commonly
used
names
for
p
are
“freestream
pressure”
or
“farupstream
pressure”.
For
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 Fall '05
 MarkDrela
 Pressure measurement, Airfoil, Bernoulli's principle

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