[Paraview] particle tracing and particle tails help

Thu Apr 7 04:59:05 EDT 2011

The data looks like rubbish to me. Points jump around in seemingly random sequences.

Either ...

1) time steps are too large

2) ID's are not consistent so partice N is not being correctly tracked.

3) (particles are being destroyed and recreated and reusing ID's from previous particles)

using the test data you uploaded, I used 'find data' to extract particles between ID 1 and 50, then added a particlepathlines filter and let it run. Looks rubbish. Also you seem to have a periodic boundary, so I set the max step size to 20, (your box seems to be 25 across), the max step size is useful for solving periodic boundaries and issue 3) above.

you need better data to get a decent animation.

JB

[cid:image001.jpg at 01CBF512.CA9B1A50]

-----Original Message-----
From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Dan Lussier
Sent: 06 April 2011 21:37
To: paraview at paraview.org
Subject: [Paraview] particle tracing and particle tails help

Hi.

I am having a lot of trouble getting particle tracing to work - and

frustratingly can't even get any output to work so trouble shooting is

very difficult.  I've broken down my situation below:

Setup:

-------

* PV 3.11 from git

* pv-Meshless plugin installed

Data:

-----

* time-aware XDMF files

* particles represented in PV on unstructured mesh using XDMF

TopologyType="Polyvertex"

* Usually 100,000 to 10 million particles

      - Reduced size sample files are available at:

http://dl.dropbox.com/u/17666990/sample_particle_data.zip

      - Each individual file is a single frame, which are assembled in a

XDMF temporal collection in dump_argon_state_rdfval2_TEMPORAL-

SUMMARY.xmf.  This is the file that should be loaded to allow for

access to all frames.

Output

--------

I would like to be able to trace the path of a subset of particles

from within the larger dataset over time, and have its path traced out

in 3D space.  This is in contrast to tracing the advection of trace

particles within a vector field, which is possible from what I

understand via the ParticlePathlines filter.

I have tried playing around with the ParticleTracer and

ParticlePathlines filters in PV, but cannot get anything to work.

One thing I'm wondering about is whether my particles jump around too

much (i.e. their displacement is too large between frames).  It is

likely that this occurs because each frame represents the output from

simulation code which may be separated by between 100 to 10000

simulation timesteps.

I have tried crawling through the PV mailing list archives but wasn't

able to find many comments that were current, and fit what I was

looking for.  I am open to any suggestions on how I could get this

working using my data, and would really, really appreciate if someone

could point me towards some examples online that show the actual

pipelines with sample data to pull off something like this.

Thanks,

Dan

_______________________________________________

Powered by www.kitware.com

Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html

Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView

Follow this link to subscribe/unsubscribe:

http://www.paraview.org/mailman/listinfo/paraview
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.paraview.org/pipermail/paraview/attachments/20110407/018e06b5/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 51843 bytes
Desc: image001.jpg
URL: <http://www.paraview.org/pipermail/paraview/attachments/20110407/018e06b5/attachment-0001.jpg>