Abstract
Three-dimensional vortex structures in the corner region of translating normal plates are visualized experimentally with defocusing digital particle image velocimetry. Vortex formation processes for three plates with corner angle <TEX>$60^{\circ}$</TEX>, <TEX>$90^{\circ}$</TEX>, and <TEX>$120^{\circ}$</TEX> are compared in order to study the effect of corner shape on vortex formation. In all cases, the self-induction of the starting vortex and its interaction with the potential flow induced by the moving plate cause the vortex to change its form dynamically after the plate starts to translate. While the vortex near a corner follows the plate in the low corner angle of <TEX>$60^{\circ}$</TEX>, the vortex separates early from the plate and its forward motion becomes slow in the high corner angle of <TEX>$120^{\circ}$</TEX>. It is also found that the starting vortex can transport inward at the corner, which depends on the corner angle.
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