[Paraview] [EXTERNAL] animating particle pathlines

[Moreland, Kenneth]

(Replying back to the ParaView mailing list so others can benefit from the conversation or fill in my knowledge gaps.)

I admit that I have found the Temporal Particles To Pathlines filter sometimes temperamental. I have to guess what might be going wrong. Here are some possibilities:


·         The filter draws lines of data as points move around over time. No lines will be drawn unless you hit that play button.

·         The filter needs to have consistent ids to know how to attach points from one time step to another.

·         The filter has a mask points feature that by default tracks only 1 out of every 100 points. You might need to lower that (possibly down to 1) to make things visible.

·         The filter has a max step distance option that will ignore connections of particles that move more than a certain distance between time steps. By default, that distance is 1 unit in every direction. If you have data that covers a large space, it might be the particles are moving too far to be tracked. You might need to bump that up.

·         The filter relies on time metadata in its input dataset to track when time advances. If this metadata is not there, you will probably get some errors in the output message window (with one about DATA_TIME_STEPS), and you will get no output data.

Without seeing your data, I don’t think I can narrow down the problem any further.

-Ken

From: "David I. Robinson" <d.robinson at hrwallingford.com>
Date: Tuesday, November 15, 2016 at 2:32 AM
To: "Moreland, Kenneth" <kmorel at sandia.gov>
Subject: RE: [EXTERNAL] [Paraview] animating particle pathlines

Hi Ken,

Do you know how to make that work?  I’ve have wrestled with that filter endlessly with no success.  I just get a blank screen, or it crashes.

Dave

From: Moreland, Kenneth [mailto:kmorel at sandia.gov]
Sent: Monday, November 14, 2016 10:30 PM
To: David I. Robinson
Cc: paraview at paraview.org
Subject: Re: [EXTERNAL] [Paraview] animating particle pathlines

That sounds like a job for the "Temporal Particles To Pathlines" filter.
-Ken

Sent from my iPad so blame autocorrect.

On Nov 14, 2016, at 10:54 AM, David I. Robinson <d.robinson at hrwallingford.com<mailto:d.robinson at hrwallingford.com>> wrote:
Hello,

I’m trying to visualise lagrangian particle pathlines.  I have run an openFoam simulation with particle tracking and would like to view the paths that the particles take.  I have read lots of discussion of this on the internet, but without much success.  I can load the data in Paraview and assign glyphs, but I can’t visualise the pathlines taken by the particles.

I am cautious that Paraview might have some functionality for interpolating particle tracking from the eulerian data.  I might end-up visualising this approximation, rather than the lagrangian data calculated on a timestep-by-timestep basis by openFoam.  (Although an ability to do either or both would be useful!)

So far, my best luck seems to have come from masking my data and then using the particlepath filter, using the un-masked data as my input and the masked data as a seed.  This is OK, but requires me to incrementally increase the finished time to observe the particle paths.

Can you offer any help?


Dr David Robinson
Engineer, Coastal Structures

E: d.robinson at hrwallingford.com<mailto:d.robinson at hrwallingford.com>
T: +44 (0)1491 822397
<http://www.hrwallingford.com/banner.html>
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