[CIG-LONG] Conservation of Mass

[Brian Wilson]

Hi all,

I'm working on a model of lithospheric drip and despite having zero flux on
the boundaries, I am getting downward velocities with no compensating
upwelling, which would seem to violate the divergence free condition. Has
anybody else had a similar problem and/or figured out a solution? I've
attached a copy of my input file if anyone wants to look at it; everything
is scaled as follows: distance: km, mass: 10^15 kg, time: m.y.

Thanks,
Brian
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