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Re: [Question #248341]: Quasi-static simulation

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Bruno Chareyre <question248341@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 15 May 2014 11:36:45 -0000
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Question #248341 on Yade changed:
https://answers.launchpad.net/yade/+question/248341

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
You can't force the system to be static in explicit dynamics, the system does what it has to do.
"Calming" the system is like using a large damping: the system would converge to an equilibrium eventually, but you refrain it from doing so. The result is even worst.
The only way is to reduce strain rate (in strain per second) again.
Another question is to know if you could increase computation rate (in strain per iteration), i.e. using a larger timestep. Practically:
1/ do you use the largest possible timestep, and if so
2/ do you really need such a high contact stiffness?
3/ do you need so many particles?

If the the answers are yes/yes/yes, the only solution is to wait longer.

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