Abstract
We consider a planar stagnation-point flow on a directionally-solidifying interface and determine its effects on its morphological instability. We find that when Schmidt numbers are large, two-dimensional long-wave disturbances are unstable for any degree of constitutional undercooling. These modes propagate against the basic-state flow and are destabilized by the component of this flow normal to the interface. Analogous results are given for the axi-symmetric stagnation-point flow subject to axi-symmetric disturbances. Comparisons are made of the two cases.
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