diameter and density default values?

Submitted by prasantud on Tue, 08/09/2011 - 08:09

hi everybody,
can you tell me what are the default values of diameter and density in the atom_style granular. It is definitely not 1m and 1kg/m3 in si units. It is not mentioned in the manual.
thanking you,
Samantaray

Forums:

steve | Tue, 08/09/2011 - 08:17

Hi Samantaray,

it should be meters and kilograms/meters^3 like it is written in the manual under the units command.

Steve

prasantud | Tue, 08/09/2011 - 08:38

Hi Steve,
The examples in LIGGGHTS do not specify the diameter, but the granular particles will have diameter around 0.001m.
how can a particle have 1m diameter in the region reg block -0.05 0.05 -0.05 0.05 0. 0.15 units box.
Samantaray

prasantud | Tue, 08/09/2011 - 09:36

hi everybody,
it is written in manual that the region command creates the block in the simulation box units.
what is simulation box unit, is it the default distance unit which in si is 1m.
then how come a default particle diameter of 1m will be inside the region reg block -0.05 0.05 -0.05 0.05 0. 0.15 units box.
thanking in advance,
Samantaray

ckloss_ | Tue, 08/09/2011 - 15:39

The particle diameter and density are defined via fix particletamplate/sphere commands.

Christoph

prasantud | Tue, 08/09/2011 - 17:34

Hi Christoph,
But this does not explain the default value of particle diameter being 1 metre in si units and density of 1kg/m3.
All the LIGGGHT examples dont define radius and density. But they cannot take the particle of 1metre diameter.
needs more clarification.
Samantaray

ckloss_ | Tue, 08/09/2011 - 22:22

>>All the LIGGGHT examples dont define radius and densit
Thats just not true - they are defined via fix particletemplate/sphere commands or via fix pour

If you don't like the default values, just override them :-)

Christoph