<s>
Flow	B-Application
visualization	I-Application
or	O
flow	B-Application
visualisation	I-Application
in	O
fluid	O
dynamics	O
is	O
used	O
to	O
make	O
the	O
flow	O
patterns	O
visible	O
,	O
in	O
order	O
to	O
get	O
qualitative	O
or	O
quantitative	O
information	O
on	O
them	O
.	O
</s>
<s>
Flow	B-Application
visualization	I-Application
is	O
the	O
art	O
of	O
making	O
flow	O
patterns	O
visible	O
.	O
</s>
<s>
Surface	O
flow	B-Application
visualization	I-Application
:	O
This	O
reveals	O
the	O
flow	O
streamlines	B-Application
in	O
the	O
limit	O
as	O
a	O
solid	O
surface	O
is	O
approached	O
.	O
</s>
<s>
Assuming	O
that	O
the	O
particles	O
faithfully	O
follow	O
the	O
streamlines	B-Application
of	O
the	O
flow	O
,	O
we	O
can	O
not	O
only	O
visualize	O
the	O
flow	O
but	O
also	O
measure	O
its	O
velocity	O
using	O
the	O
particle	O
image	O
velocimetry	O
or	O
particle	O
tracking	O
velocimetry	O
methods	O
.	O
</s>
<s>
In	O
scientific	B-Application
visualization	I-Application
flows	O
are	O
visualized	O
with	O
two	O
main	O
methods	O
:	O
</s>
<s>
Analytical	O
methods	O
that	O
analyse	O
a	O
given	O
flow	O
and	O
show	O
properties	O
like	O
streamlines	B-Application
,	I-Application
streaklines	I-Application
,	I-Application
and	I-Application
pathlines	I-Application
.	O
</s>
<s>
Texture	B-Application
advection	I-Application
methods	O
that	O
"	O
bend	O
"	O
textures	O
(	O
or	O
images	O
)	O
according	O
to	O
the	O
flow	O
.	O
</s>
<s>
Thus	O
flow	B-Application
visualization	I-Application
is	O
equally	O
important	O
in	O
computational	O
as	O
in	O
experimental	O
fluid	O
dynamics	O
.	O
</s>
