yade-users team mailing list archive

[Anton Gladky <gladky.anton@xxxxxxxxx>]

Hi,
this is a more-less normal time step for simulations.
Sometimes I have to do:
O.dt = 0.1*pWavetimestep



2010/7/8 Michael Jensen <jenmichael2000@xxxxxxxx>

> one thing that I would be particularly interested in is how the formula on
> this page:
>
> https://www.yade-dem.org/sphinx/yade.utils.html#yade.utils.PWaveTimeStep
>
> for spherepwavetimestep is computed.
>
> 2.8284271247461903e-07 is a very small number, meaning a huge
> number of iterations are required (almost 10 million) before a=20
> single second goes by in the simulation.  that's a hell of a lot
> of iterations!  for one second!  is it really necessary?
>
> -mike..
>
>
> --- On *Thu, 7/8/10, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>* wrote:
>
>
> From: Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>
> Subject: Re: [Yade-users] hello? -help with a spinning bucket!
> To: yade-users@xxxxxxxxxxxxxxxxxxx
> Received: Thursday, July 8, 2010, 10:13 AM
>
>
>   It seems to me that if I put some beads into a container, then tip the
> container, the angle at which they start flowing is the angle of internal
> friction..  I am not at all sure of this, it seems far to simple.
>
> Not really. Angle of repose corresponds to "internal packing friction",
> which "depends on" contact friction but is not equal.
> Most materials have contact friction around 30°. Put this value at contact
> in a loose sphere packing and you will get an internal friction around 18°.
> Anyway, you should get realistic results as soon as you define a decent
> friction (say between 10 and 40), this is not a crucial parameter yet.
>
> Bruno
>
>
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