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Hele-Shaw Flows: Historical Overview

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Fingering and ill-posed problems<br />

• Receding viscous fluid performs an ill-posed problem.<br />

• Kinetic undercooling regularization (Reissig, Hohlov,<br />

Rogozin, Entov from 1995)<br />

β ∂p<br />

∂n<br />

+ p = 0, on Γ(t), β > 0.<br />

• Surface tension regularization<br />

<br />

<br />

p = βκ(z,t).<br />

z∈Γ(t)<br />

BIRS, Canada, July 2007 – p. 63

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