yade-dev team mailing list archive

[boon chiaweng <booncw@xxxxxxxxxxx>]

Thanks Vaclav.  There are too many files to upload.  I have a modified Triaxial Test, Triaxial Compression Engine, TriaxialStressController, because I have used a new contact law.  It is from the CohesiveFrictionalLaw but without creep and cohesion.  So it is a cohesionless moment resistance law.  I'm using one of the old releases.  I am trying to simulate a paper by Plassiard et al. (2009) "A spherical discrete element model: calibration procedure and incremental response".  They used the Weibull distribution.  I have modified the SpherePack file to calculate the radius, according to their paper.  So I have a group of files..

Real rMin = rMax/MaxMinRatio; 
        Real r = rMin + (rMax-rMin)* pow( (-Alpha*Mathr::Log(1-rnd())) ,1/Gamma);

Some particles are really small.  But everytime i run a simulation, it gives me a different timestep.  And sometimes it is very large, because I have very large particles in the simulation.  But the calculation of the timestep should be based on the smallest particle.


Yours,

CWBoon



> Date: Sun, 10 Jan 2010 17:15:14 +0000
> From: eudoxos@xxxxxxxx
> To: yade-dev@xxxxxxxxxxxxxxxxxxx
> Subject: [Yade-dev] [Bug 505523] Re: Velocity Bin
> 
> Attach your simulation. Likely it is problem on your side with
> simulation going nuts numerically.
> 
> One of common causes of NaN velocity is having body with zero mass
> dynamic (such as a facet), which gives inf acceleration etc.
> 
> BTW if you don't know what NaN is, check
> http://en.wikipedia.org/wiki/NaN .
> 
> -- 
> Velocity Bin
> https://bugs.launchpad.net/bugs/505523
> You received this bug notification because you are a member of Yade
> developers, which is subscribed to Yade.
> 
> Status in Yet Another Dynamic Engine: New
> 
> Bug description:
> I have the following error:
> 
> 614459 FATAL yade.VelocityBins /home/chiab/yadeNew/Branch3/pkg/common/DataClass/VelocityBins.cpp:77 setBins: Body #1998, velSq=nan not put in any bin!?
> 614459 [0x7f16ef013950] FATAL yade.VelocityBins null - /home/chiab/yadeNew/Branch3/pkg/common/DataClass/VelocityBins.cpp:77 setBins: Body #1998, velSq=nan not put in any bin!?
> 
> Also, global stiffness timestepper seems to give me an exceedingly large step.  Sometimes 1e(positive)8!
> 
> 
> CWBoon
> 
> 
> 
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