[afo]

Hi Foamers,

I'm simulating a granular flow with icoUncoupledKinematicParcelFoam, I was able to give a normal distribution to the particle size, paraview sees that radius varies from particle to particle, but it visualizes particles with a constant radius. I can see that particles don't touch, because actual radius is different from the visualized one, how can i show particles with different diameters?

p.s. : In the attached picture you can see what happens.

[andrea.pasquali]

Hi Paolo,
Are you using the PointSprite plug-in in ParaView?
If yes in the "Object Inspector - Display" select "Scale by - radius", then push the button "Edit Radius Transfer Function" and finally select "Proportionnal" instead "Use scalar range".
Now the radius of your particles will be the correct one

Andrea

[afo]

Actually I'm not using that plug-in. How can I use it?

[AMahrla]

Hi!

If you use foamToVTK and paraview, you can scale the sphere-glyphs to particle radius.

Please refer to http://openfoamwiki.net/index.php/Ma...gian_particles. for creating the sphere-glyphs.

After having created the glyphs (type: sphere, scalar: radius), choose scaling by scalar, set scale factor to 1.

A tutorial collection for particle based methods can be found here.

Best,

Astrid

[afo]

many thanks

[afo]

Hi Astrid, I've run foamToVTK and it generated a number of files, how do I open them in paraView? sorry for the boring question, but I'm new to this. Thanks

[AMahrla]

Please follow the instructions in
http://www.openfoamwiki.net/index.ph...idParticleFoam
and
http://openfoamwiki.net/index.php/Ma...gian_particles

Best,

Astrid

[afo]

thanks astrid

[afo]

Hi Andrea,

I tried to use that plug-in, but if I zoom in, spheres don't touch. Any suggestion?

[andrea.pasquali]

It depends on the n. pixels used to reproduce your sphere.
You have to increase the "max pixel size". I think 512 is enough.

Andrea

[afo]

Dear Andrea,

I've just resolved the problem. I don't need to use pointSprite, glyph filter is enough, here are the settings:

In Glyph properties:

Scalars d // which is the particle diameter
Glyph type Sphere
Radius 0.5 // since Scalars is a diameter, if it was a radius, Radius must be 1 ( obviously! )
Scale Mode Scalar
Set Scale Factor 1

Thanks anyway for your help and your time

Paolo Tria

[andrea.pasquali]

Ciao Paolo,
I think, if you can, that it's better to use the point sprite plugin than the glyph filter.
The glyph filter has to be re-generated each timestep and if you have many particles and many times this could be very very onerous!
The point sprite plugin is just a different view mode (like point, surface ...) to see you data and it is very fast!
Anyway for not big model glyph filter could be enough

Andrea