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[Question #245755]: Setting manually the inertia and mass center of clumps

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Pascal Hagenmuller <question245755@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 19 Mar 2014 15:31:29 -0000
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New question #245755 on Yade:
https://answers.launchpad.net/yade/+question/245755

Hello,

I am using Yade to model snow mechanics. I describe snow grains, obtained from tomography, as clumps made of non overlapping spheres. Yade automatically computes the mass M, center of mass C and inertia (eigenvalues of inertia matrix EigVal and orientation Ori). However, I can compute these variables (M,C, EigVal and the matrix of eigen vectors EigVec) directly from the 3d image obtained with tomography, with a better accuracy. So I would like to set mass, center of mass and inertia manually. 

I am a bit confused with the inertia in Yade which is a vector and not a matrix. Is the following procedure right ?

I plan to do on a clump B:
B.state.mass = M
B.state.refPos = C
B.state.inertia = EigVal
B.state.ori = Quaternion(EigVec) or B.state.refOri = Quaternion(EigVec) ?

Moreover, am I sure that Yade won't automatically update this attributes with its own procedure ?

Thanks,
Pascal







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