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Here, the problem comes from a deformable body that changes the area where it touches the container in the centrifuge. The skin of the grape is crucial and pretty tricky, too; responsible for tensile strength and elasticity tensor, but having no appreciable depth. Waaaaay too complex model for this kind of problem, but I like the challange. I'm also curious how far I can take it before it'll force me to drop analytical formulae in favour of numerical approximations. Deciding to share my results isn't going to be hard, but there's a question what could be learned from a failure in this case. We have quite a few physicists around here, so I think 'when' is the real queston. :)