The flow produced by an infinite rotating disk when the fluid at infinity is in a state of solid rotation is investigated numerically. When the fluid at infinity is rotating in the same sense as the disk, physically acceptable solutions exist in all cases. When the fluid at infinity is rotating in the opposite sense to that of the disk, the only physically acceptable solutions appear to be those in which there is a uniform suction present acting through the disk.
It is demonstrated that hierarchical classifications have computational advantages over cluster analyses. Flexible programs are outlined providing two sorting strategies and four alternative similarity-coefficients. Preliminary results suggest that for qualitative data one of the strategies and two of the coefficients are superior to the remainder of the system; the further refinements desirable for a large-scale production program are discussed.
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