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-   -   Particle size show on DEM solver (http://www.cfd-online.com/Forums/star-ccm/97497-particle-size-show-dem-solver.html)

chandi February 18, 2012 09:03

Particle size show on DEM solver
 
Hi frnds,

I am working on DEM solver of STAR-CCM+. I created some particles of size of 0.01 m diameter. But when I am seeing in the scalar scene, it is not showing the actual size of the particle. As a result, it is looking so tiny as compared to the whole system that it is not possible to distinguish it.

Could any one help me that how can I see the original size of the particle.

With regards,

Chandi

Doro_M. January 9, 2013 09:43

Hi everyone,

I'm new to this forum and to CFD, I just started my master thesis for which I use StarCCM+.

I'm having the exact same problem as chandi, so I will use this thread instead of a new one, I hope that's ok. So perhaps someone of you could help me.

I did one of the DEM tutorials (Blast Furnace), but when it came to the simulation, the particles are not displayed in the structure as they should. When I switch the Point Scale Mode from Scalar to Pixel, I can see the particles as pixels, but when Scalar is chosen, nothing appears.

Does anyone of you have an idea what's the problem? Is this some known bug or could it be an issue with the graphics?

Thanks for any answer,
Doro

himanshu28 March 17, 2013 09:13

Same Problem
 
Hi ,

I am also trying to visualize the DEM particles in the domain but couldn't see them. If anybody know how to create the appropriate scene for seeing those particle help.:(:(:(

Thank You

Himanshu sharma

Kasey March 21, 2013 19:03

Are you sure that the particles are being meshed properly?

In the scalar scene - outline and scalar properties you can change the representation of the selected part or region. If you can see the particles when represented as the original geometry and not as a meshed surface, it's probably a problem with your mesh.

himanshu28 March 23, 2013 14:40

Quote:

Originally Posted by Kasey (Post 415587)
Are you sure that the particles are being meshed properly?

In the scalar scene - outline and scalar properties you can change the representation of the selected part or region. If you can see the particles when represented as the original geometry and not as a meshed surface, it's probably a problem with your mesh.


Do we need to create spherical particle in our geometry as well as i went through the tutorial i found that we just need to specify particle diameter and it would be generated inside the region automatically....??

crevoise April 24, 2013 05:37

Did someone eventually got some hint about this issue, of particle representation in scene?
Thank you

himanshu28 April 24, 2013 06:13

Quote:

Originally Posted by crevoise (Post 422786)
Did someone eventually got some hint about this issue, of particle representation in scene?
Thank you

No solutions....i couldn't make what the previous post have tryed to explain.

Kasey May 14, 2013 13:35

I just set up this simulation, and had no trouble with the visualization. In the scene, make sure you select particle diameter as the function on the point size scale field tab.

himanshu28 May 14, 2013 13:42

Quote:

Originally Posted by Kasey (Post 427508)
I just set up this simulation, and had no trouble with the visualization. In the scene, make sure you select particle diameter as the function on the point size scale field tab.

Hi,

Thanks for replying

Can you just provide some snap shots of your simulation setup . it will be helpful to refer it will setup things easily.

crevoise May 15, 2013 06:41

1 Attachment(s)
Hello Kasey

Thank you for the hint, I wonder how I did not found this before on the manual (for the one interested, on the page 6241 and 2 tutorials from the page 8500).

I have more questions about it.
1/ It seems this method is working when you set it up before the computation, and then run the calculation. right?
2/ When using it, I do not succeed to get 'spherical' droplet, which is strange (they appear pixel, albeit I chose 'Point Scale Mode:Scalar'). Do you have any clue for it?
Moreover, only few of the droplets appear, not the full set
As you can see on the attached picture, for an injection of droplet into a pipe, only few 'droplets' appear. However, if I am plotting the droplets track file, one can see that droplets have been computed further downward the pipe.
3/ I want to get the droplet distribution profile at the exit of a pipe, for example. In StarCD I would have wrote a macro to calculate the droplet diameters at every cells on the outlet of the pipe. I checked in CCM on the report, but it's not possible to do so. Does anyone has idea about it?

Thanks


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