If you want to write up the note and tell me where it should be put,
I'll add it to the html documentation.
David
Given a set of streamlines
starting from a plane I would like to create a surface connecting
all the streamlines at time t.
Here's one idea: create a macro that iterates over the group (of
streamline fields) and extracts the value (position) for each
streamline (i.e., ForEachMember, Select(member number), then
Extract("positions"), then Select(sequencer value as index into
positions list)). The macro is fed by the output of Streamline, not
Isosurface, by the way.
Something to consider ...
I think that the integration that is performed for the convection of
the particle along the streamline is governed by the displacement of
the particle, so there is not a constant time step across the
streamlines. So the 4th coordinate of streamline 1 may not be at the
same time as the 4th coordinate of streamline 2. This is probably
why "time" is one of the outputs of the streamline ( and streakline
) modules. So I think you would still need to use isosurface to
identify the position along each of the lines at a particular time,
isosurface conveniently performing the interpolation for you.
While we are on the subject of streamlines and streaklines, its been
bothering me that the streakline module does not produce
streaklines, at least not in the aerodynamic definition of the word.
What it produces is a pathline, or a particle path. The module shows
the trajectory of a single particle as it moves through an unsteady
flowfield. To create a streakline, you release a series of particles
from a single point in space. Typically, the particles are released
continuously and this gives the impression of a line. Any chance a
note to this effect could be added to the documentation next time it
is changed?
Norman W. Schaeffler
*********************************
Norman W. Schaeffler, Ph.D.
Flow Physics and Control Branch
NASA Langley Research Center
Mail Stop 170, Building 1247A, Room 107
Hampton, Virginia 23681
E-Mail: [EMAIL PROTECTED]
Phone: (757) 864-5390
--
.............................................................................
David L. Thompson The University of Montana
mailto:[EMAIL PROTECTED] Computer Science Department
http://www.cs.umt.edu/u/dthompsn Missoula, MT 59812
Work Phone : (406)257-8530
