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Re: [Question #189897]: TriaxialCompressionEngine : particles packing with desired porosity

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From: Chareyre <question189897@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 08 Mar 2012 10:25:50 -0000
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Question #189897 on Yade changed:
https://answers.launchpad.net/yade/+question/189897

    Status: Open => Answered

Chareyre proposed the following answer:
Ali,
I'm the main developer of the triaxial engine you are using, but unfortunately this "fixedPorosity" feature has been added by somebody else and I never really understood what it was supposed to do. I'm considering removing it. Don't use it.

Try using TriaxialStressController or ThreeDTriaxEngine, it will be simpler to  understand their behaviour (see triaxial tutorial in scripts/) than that of CompressionEngine.
The purpose of these engines is to control precisely stress and strain rate. Actually, if what you want is just to impose an arbitrary volume to a sphere packing, why not just moving boundaries to a fixed position? You don't need any engine for this.

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