yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Hello Kan

There is no precise answer to your question, unless you give us the 
stiffness of particles, their density and sizes, and the number of 
iterations you need. I can confirm the numbers given by Vaclav below, 
but they can fluctuate a lot depending on the parameters of the model.
To give you an idea, the number of particles in my DEM simulations are 
usually between 10,000 and 20,000; and the computations need often more 
than 1 hour. But again, they need more than an hour because I need more 
than 100,000 iterations. Would I need only 1000 iterations, then the 
computation time would be 100 times less.
The only thing I'm sure is that 1 million particles is a lot.  I don't 
think somebody tried this before.

Bruno






>> 2. How long will it take to get a good result if I simulate about 
>> 1Million particles with my computer? or how long it will take to compute 
>> 1sec at real-world time, or what is the general time step in the DEM 
>> part of YADE---the level of 1 ms, or 0.001 ms?
>>     
>
> Those who have done large simulations (Bruno, Janek?) can respond from 
> experience. For the timestep, it will be in the order of elastic wave 
> propagating over the distance of particle diameter. E.g. for concrete with 
> particles of 1mm and 4000m/s, it would give some 2.5e-7s, i.e. 250ns (am I 
> wrong here?).
>
> There is dynamic timestepper that will adjust dt based on stiffnesses of 
> interactions.
>
> Regards,
>
> Vaclav
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>   

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