Nonlinear instability of Hele-Shaw flows with smooth viscous profiles |
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Authors: | Prabir Daripa Hyung Ju Hwang |
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Institution: | a Department of Mathematics, Texas A&M University, College Station, TX 77843, USA b Department of Mathematics, Postech, Hyoja-dong San 31, Pohang 790-784, Republic of Korea |
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Abstract: | We rigorously derive nonlinear instability of Hele-Shaw flows moving with a constant velocity in the presence of smooth viscosity profiles where the viscosity upstream is lower than the viscosity downstream. This is a single-layer problem without any material interface. The instability of the basic flow is driven by a viscosity gradient as opposed to conventional interfacial Saffman-Taylor instability where the instability is driven by a viscosity jump across the interface. Existing analytical techniques are used in this paper to establish nonlinear instability. |
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Keywords: | 35L 35P 35Q 76B 76E |
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