yade-users team mailing list archive

[Jan Stránský <question252656@xxxxxxxxxxxxxxxxxxxxx>]

Question #252656 on Yade changed:
https://answers.launchpad.net/yade/+question/252656

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello Colin,

as the error says, sigmaT[0] is NaN.

I usually get these errors when I have for some reason time step larger
than the critical one and the simulation goes to instable regime and soon
some value goes to NaN. Could this be your case? As you mentioned
"scaling", did you also correctly modify the time step?

If this is not the case, we will find another reason :-)

cheers
Jan



2014-08-05 14:37 GMT+02:00 Colin Power <question252656@xxxxxxxxxxxxxxxxxxxxx
>:

> New question #252656 on Yade:
> https://answers.launchpad.net/yade/+question/252656
>
> Hi, I have a simulation that uses randomDensePack() and the CPM model to
> pack about 5000 spheres. On my initial testing, I appended about 250
> spheres using a script and was able to run the simulation to completion.
> When I scaled up the simulation I got this error after about 370000
> iterations:
>
> FATAL
> /tmp/buildd/yadedaily-1.10.0-72-d9ab58c~precise/pkg/dem/ConcretePM.cpp:399
> go: Verification `!isnan(sigmaT[0])' failed!
> FATAL
> /tmp/buildd/yadedaily-1.10.0-72-d9ab58c~precise/pkg/dem/ConcretePM.cpp:399
> go: in interaction #25639+#36271
> terminate called without an active exception
> Aborted (core dumped)
>
> I took a quick glance at the file linked below but was not able to figure
> out my problem.
>
> https://github.com/yade/trunk/blob/1997c194c0aa759cae101a3dd0a559fcf049b29f/pkg/dem/ConcretePM.cpp
>
> Thank You,
> Colin Power
>
> --
> You received this question notification because you are a member of
> yade-users, which is an answer contact for Yade.
>
> _______________________________________________
> Mailing list: https://launchpad.net/~yade-users
> Post to     : yade-users@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~yade-users
> More help   : https://help.launchpad.net/ListHelp
>

-- 
You received this question notification because you are a member of
yade-users, which is an answer contact for Yade.