yade-users team mailing list archive

[Luc Sibille <luc.sibille@xxxxxxxxxxxxxx>]

Sorry Vaclav, I didn't saw your mail!

Václav S a écrit :
>>> My question: is there a way, with the current code, to avoid that?
>>> For instance am I allowed to create an engine doing a loop over all the 
>>> bodies and calling inside the loop, for each body, the engines 
>>> MagnetEngine and GravityEngine.  
>>>     
>> What you suggest would work (some would call it a "hack" though...), 
>> except that you need at least two engines : one for loops on bodies and 
>> one for loops on interactions.
>> Not sure how much time it would save, I'm really wondering too.
>>   
> You would need more, since typical scenario mixes loops over bodies and
> interactions like this:
> 
> (0. reset physical actions, increate time by dt etc.)
> 1. loop over bodies: create bounding boxes, collide them, create contacts.
> 2. loop over contacts: create interactionGeometry and interactionPhysics
> for them; use some material law to deduce forces on bodies in interaction.
> 3. loop over bodies: to apply other forces (gravity etc), get
> accelerations, integrate and displace.

I agree with you, it would not be so simple and there are loops that you 
cannot merge as you said.

> 
> The module spherical-dem-simulator (which I never used): non-modular
> spherical DEM that could be benchmarked against the same scenario with
> regular engine-based architecture. Since Bruno said we are like 30%
> behind PFC for dem (which I would think is monolithic), I would be
> inclined to attribute those 30% to modularity.
> 
> Regards, Vaclav
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-- 
Luc Sibille, Université de Nantes - Laboratoire GeM, maître de conférence

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IUT de Saint Nazaire - Département de Génie-Civil
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44606 Saint-Nazaire Cedex   France

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