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Re: [Question #407652]: negative or positive prescription of forceN

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question407652@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 20 Dec 2016 16:09:33 -0000
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Question #407652 on Yade changed:
https://answers.launchpad.net/yade/+question/407652

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Liu,

see the source code of VTKReorder [1] and CpmPhys [2], the implementation
differs by the sign. In Cpm, positive force is tension, so in Paraview
output, positive force is compression (you can do a simple 2 particles test
where you know the result in advance). You can use Paraview Calculator
filter to swap the behavior.
Cheers
Jan

[1] https://github.com/yade/trunk/blob/master/pkg/dem/VTKRecorder.cpp#L470
[2] https://github.com/yade/trunk/blob/master/pkg/dem/ConcretePM.cpp#L431

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