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Re: [Question #668191]: The spheres explodes at the first iter

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question668191@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 23 Apr 2018 12:12:43 -0000
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Question #668191 on Yade changed:
https://answers.launchpad.net/yade/+question/668191

    Status: Open => Answered

Jan Stránský proposed the following answer:
If you do not assign any material to particles (like you did in 
O.bodies.append(ymport.text('particles.txt'))
and/or
 sp=pack.SpherePack()
 sp.makeCloud(mn,mx,rmean2,rfuzz,numBall,False, 0.95,seed=1)
 sp.toSimulation()
), then the last O.materials.appended material is used for them. In your case with density 0 and therefore of course Nan after NewtonIntegrator. Specifying material should fix it:

O.bodies.append(ymport.text(... , material='spheres'))
sp.toSimulation(material='spheres')

cheers
Jan

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