Hi Everyone
I am running a model of a drum with spheres in it. The drum is imported from an STL file. When I run this, I get the following warning repeatedly:
"WARNING: Dangerous build in triangle neighbor list."
Do I need to be concerned with this? Is there perhaps a problem with the STL file? I did notice that my spheres might be escaping the drum, but I need to double-check for a reason.
I could only find the following in the "fix_tri_neighlist.cpp" file:
//if a fix move/mesh/gran is registered, advise the user to increase skin safety (and eventually shorten time-step)
//if a fix pour is registered, advise the user to increase distance between insertion region and the mesh/gran wall
I think none of the above advice is applicable since I am not using the mentioned fixes in the model.
Thank you
Alexander
ckloss | Tue, 06/15/2010 - 13:47
Re: Dangerous build in triangle neighbor list
Hi Alex,
that is most probably a bug - I recently discovered a bug in that routine that will be fixed in the next release - probably it is related to that.
If you mail me the input script and the STL file I will have a look.
Best,
Christoph
ckloss | Tue, 06/15/2010 - 16:39
Re: Re: Dangerous build in triangle neighbor list
Hi Alex,
some of your particles that you read into the simulation from the data file have an inital overlap with the wall - which is bad!
You should generate them in a way that they have a safe distance from the wall when they are read.
Please see if the error persists then (it hopefully shouldn't)
Christoph
raguelmoon | Wed, 06/16/2010 - 04:12
Hi Christoph, What do you
Hi Christoph,
What do you mean by safe distance from the wall? Should it be large or small gap?
Best..
Ram
ckloss | Wed, 06/16/2010 - 14:32
Re: Gap distance
Hi ram,
there should be no initial overlap with the wall. In earlier versions you had to obey a certain distance from the wall to the insertion volume, but in 1.0.4, this is no longer necessary.
You only have to be careful when using fix pour/legacy because it generates the particles in a way that only the particle centers are in the insertion region, whereas the new fix pour/dev generates the particles in a way that they are completely contained within the insertion region
Christoph