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[Bruno Chareyre <question233232@xxxxxxxxxxxxxxxxxxxxx>]

Question #233232 on Yade changed:
https://answers.launchpad.net/yade/+question/233232

Bruno Chareyre posted a new comment:
Now I see that this is ok:
if b.isClump: O.forces.addF(b.id,F_buo,permanent=True)

but with this the force on clumps become zero after some time:
O.forces.addF(b.id,F_buo,permanent=True) #The line replacement you suggested initially

Looking at the script, I don't understand why it happens, but I don't
think there is something to fix in addF itself.

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