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[sega <dorofeenko@xxxxxxxxx>]

> What do you mean by rotational friction?

Resistance to a rotary motion, not to a torsion motion (i.e. rotary around contact normal).
But I am not assured that it is necessary here.

> For me this simulation is unrealistic because there are not enough
> spheres and they are too large. Try with more smaller spheres or play
> with friction angle..

I have uploaded the results of simulation more 5000 spheres:
http://fileland.ru/file_id-241708
http://fileland.ru/file_id-241709
They seem wrong...
While even for small quantity of spheres the result should be similar on
http://fileland.ru/file_id-241710

-- 
Best regards, 
Sergei D. 	dorofeenko@xxxxxxxxx