yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

On 29 November 2011 09:14, Chareyre <897237@xxxxxxxxxxxxxxxxxx> wrote:

> Christian,
> Yes. GSTS is fine after with kn/ks, but there are also junk values comming
> from the contact law itself apparently (after #7), maybe because of the
> other stiffness values.
>
> Chiara,
> Stable = !unstable ;)
> If you don't see an explosion and NaN values in a few timesteps, then it
> is stable.

Then according to my tests is stable while using PWave time step. But then
I would not talk about "accuracy" only because there is no explosion. Hope
this answers your question.


> There is a very narrow range of dt value where it is not exploding while
> not completely stable, something like dt +/- 10%.
> So, if you get NaN velocities for dt>=T, set dt=0.8*T and you are on the
> safe side.
> If you have, let's say, dt=0.01*T, it is stable too but you are wasting
> cpu time.
>
> --
> You received this bug notification because you are a member of Yade
> developers, which is the registrant for Yade.
> https://bugs.launchpad.net/bugs/897237
>
> Title:
>  bug in neverErase?!
>
> Status in Yet Another Dynamic Engine:
>  New
>
> Bug description:
>  If I set neverErase=True Yade crashes with following output:
>
>  O.run(3000,True)
>  RuntimeError: std::exception
>
>  and also:
>
>  Traceback (most recent call last):
>    File "/home/me/YADE/YADE2970/lib/yade-bzr2970/py/yade/qt/__init__.py",
> line 192, in refreshEvent
>                                                     15:01:13
>      self.refreshValues()
>
>                                                     15:01:30
>    File "/home/me/YADE/YADE2970/lib/yade-bzr2970/py/yade/qt/__init__.py",
> line 265, in refreshValues
>                                                      15:01:34
>      s=int(t); ms=int(t*1000)%1000; us=int(t*1000000)%1000;
> ns=int(t*1000000000)%1000
>  ValueError: cannot convert float NaN to integer
>
>
>  You can reproduce the bug with the attached script (similar to the one i
> submitted with version 2960).
>  First try to set Law2_ScGeom_MindlinPhys_Mindlin(neverErase=False), this
> will work.
>  Then set neverErase=True and yade crashes.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/yade/+bug/897237/+subscriptions
>
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-- 
You received this bug notification because you are a member of Yade
developers, which is the registrant for Yade.
https://bugs.launchpad.net/bugs/897237

Title:
  bug in neverErase?!

Status in Yet Another Dynamic Engine:
  New

Bug description:
  If I set neverErase=True Yade crashes with following output:

  O.run(3000,True)                                                                                                                                                                                             
  RuntimeError: std::exception 

  and also:

  Traceback (most recent call last):                                                                                                                                                                               
    File "/home/me/YADE/YADE2970/lib/yade-bzr2970/py/yade/qt/__init__.py", line 192, in refreshEvent                                                                                                       15:01:13
      self.refreshValues()                                                                                                                                                                                 15:01:30
    File "/home/me/YADE/YADE2970/lib/yade-bzr2970/py/yade/qt/__init__.py", line 265, in refreshValues                                                                                                      15:01:34
      s=int(t); ms=int(t*1000)%1000; us=int(t*1000000)%1000; ns=int(t*1000000000)%1000                                                                                                                             
  ValueError: cannot convert float NaN to integer  

  
  You can reproduce the bug with the attached script (similar to the one i submitted with version 2960).
  First try to set Law2_ScGeom_MindlinPhys_Mindlin(neverErase=False), this will work.
  Then set neverErase=True and yade crashes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/yade/+bug/897237/+subscriptions