Particles escaping the domain

[mariam.yehia33]

Hello all,

I have been dealing with this problem for a couple of days and it is not solved yet. I’m setting the B.C as no slip walls and yet the particle escape the domain completely as shown in this photo:

I have checked a similar topic but It seems the problem wasn’t solved. A detail that may be important is that before I added the 2 walls (in blue circle), the particles weren’t escaping.

Here is the archive of the project:

pinewood_gasification_2022-03-02T172302.323685.zip (363.7 KB)

Thanks in advance,
Mariam

[cgw]

Hi Mariam. Particles leaving the domain is a frequent issue. Search the forum for “escaping” or “otuside domain”.

These posts may help:

Particles in ghost cells

A common error is to use an STL file with stretched triangles which are removed below a small angle tolerance. Check the standard output to see if you get any message such as: STL file(s) successfully read. Total number of facets read = 208 Number of valid facets = 144 Number of ignored facets = 64 If there are ignored facets, either fix the STL file outside the GUI, or lower the small angle tolerance until there are no ignored facets. Another common issue is to have the STL…

Two particle problems in DEM

You are not saving the particle diameter in the vtp file so the scaling is off. Make sure you add the particle diameter to the list of variables in the vtp file, then the GUI will display the particles at the correct scale. The particles are probably too soft. Increase the spring stiffness (kn and kn_w) to see if it helps.

Hope this helps,

– Charles

[jeff.dietiker]

This is a bug, thanks for reporting. Looks like an issue in 2D only. While we are investigating, please setup a 3D case with one cell in the z-direction. This setup worked for me.