Singularities are added by first clicking on the appropriate
button at the top of the main window. To determine what a
button is hold the pointer steady over the button and a
pop-up hint will occur. The first five relate to singularities
and are (from left to right):
Source, Sink, Dipole,
CCW vortex, CW vortex
To place the singularity, click on the position in the view
window (which looks like graph paper). The coordinates appear
along the edge of this window.
Each time a singularity is added, its characteristics appear
in the Singularities Table.
The properties of the singularities can be edited much like
a typical spreadsheet. To change the characteristics (x
position, y position, magnitude, and orientation), click on
the value you wish to change, enter the desired value and
press the return or enter key on the keyboard.
PFlow automatically calculates
the effects of the changes made and refreshes the display.
Note: It is possible to change a
source to a sink or vice versa by simply changing the sign of
the magnitude. The same can be said about vorticies.
However, it is NOT possible to
change the type of singularity by editing the
At this time, the only possible way of deleting singularities
is by clearing all of them. This is done by choosing the
Clear Singularities button from the