2024
DOI: 10.1017/jfm.2024.330
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On the selection of Saffman–Taylor viscous fingers for divergent flow in a wedge

Cecilie Andersen,
Christopher J. Lustri,
Scott W. McCue
et al.

Abstract: We study self-similar viscous fingering for the case of divergent flow within a wedge-shaped Hele-Shaw cell. Previous authors have conjectured the existence of a countably infinite number of selected solutions, each distinguished by a different value of the relative finger angle. Interestingly, the associated solution branches have been posited to merge and disappear in pairs as the surface tension decreases. For the first time, we demonstrate how the selection mechanism can be derived based on exponential asy… Show more

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