[Paraview] generate streamlines of lagrangian particles

[Moreland, Kenneth]

(Responding back to the mailing list so everyone can see the answers.)

If I understand your response correctly, your data is a collection of particles. ParaView cannot immediately create streamlines from these data because most of volume is empty space. I assume you have velocity for the particles, but everything that is not exactly on a particle has an undefined velocity.

You could estimate the velocity everywhere by imposing a mesh on top of the particles. The most straightforward way to do this is to run the Delaunay 3D filter.

I have to say, though, I'm still confused about why you want to do this. You are asking ParaView to estimate the velocity field and then estimate a particle advection on that velocity field. That sounds extremely inaccurate compared to particles the simulation as advected in the first place. I would expect the pathlines filter to give a much better representation of the flow.

-Ken

From: Maryam <maryam.azarpira at yahoo.com<mailto:maryam.azarpira at yahoo.com>>
Date: Wednesday, May 14, 2014 4:29 PM
To: Kenneth Moreland <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Subject: [EXTERNAL] Re: [Paraview] generate streamlines of lagrangian particles

Yes, i have the 3D cylindrical fluid that have been modeled with lagrangian particles. And the data format is VTK.

Sent from my iPad

On May 15, 2014, at 2:48 AM, "Moreland, Kenneth" <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:

I'm definitely missing something, because making streamlines on a vector field should just work. Can you describe your data? For example, do you have a volume made up of 3D cells? Do you have a bunch of particles moving around in space?

-Ken

From: Maryam <maryam.azarpira at yahoo.com<mailto:maryam.azarpira at yahoo.com>>
Date: Wednesday, May 14, 2014 4:05 PM
To: Kenneth Moreland <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Subject: [EXTERNAL] Re: [Paraview] generate streamlines of lagrangian particles

Yes, i want the stream tracer but when i apply this filter or particle tracer filter they do not work.

Sent from my iPad

On May 15, 2014, at 2:27 AM, "Moreland, Kenneth" <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:

I don't understand what you mean by that. If you mean you want the streamlines that treat the vector field as a static field at a particular time step, use the Stream Tracer filter. It's on the common filters toolbar. If you mean you want the traced streams up to that point, then step your current setup with the Temporal Particles ToPathlines filter to the step you want.

-Ken

From: Maryam <maryam.azarpira at googlemail.com<mailto:maryam.azarpira at googlemail.com>>
Date: Wednesday, May 14, 2014 3:53 PM
To: Kenneth Moreland <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Subject: [EXTERNAL] Re: [Paraview] generate streamlines of lagrangian particles

Thanks for reply ken
But i want to have the streamline in a certain time step.

Sent from my iPad

On May 15, 2014, at 2:16 AM, "Moreland, Kenneth" <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:

Attach the Temporal Particles To Pathlines filter to the output of the Particle Tracer.

-Ken

From: Maryam <maryam.azarpira at yahoo.com<mailto:maryam.azarpira at yahoo.com>>
Reply-To: Maryam <maryam.azarpira at yahoo.com<mailto:maryam.azarpira at yahoo.com>>
Date: Wednesday, May 14, 2014 3:32 PM
To: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] [Paraview] generate streamlines of lagrangian particles

hi all,

does somebody know how to generate streamlines of lagrangian particles?

I execute the following steps:
1. add the temporal cache filter
2. add a line source for seeds
3. add a ParticleTracer filter
I only see the starting points, no tracing occurs.

thanx al
Maryam
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