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- W1996169145 abstract "Two problems exhibiting breakdown in local similarity solutions are discussed, and the appropriate asymptotic form of the exact solution is determined in each case. The first problem is the very elementary problem of pressure driven flow along a duct whose cross-section has a sharp corner of angle 2α. When 2α < ½π, a local similarity solution is valid, whereas, when 2α > ½π, the solution near the corner depends on the global geometry of the cross-section. The transitional behaviour when 2α = ½π is determined. The second problem concerns low-Reynolds-number flow in the wedge-shaped region |θ| < α when either a normal velocity proportional to distance from the vertex is imposed on both boundaries, or a finite flux 2 Q is introduced or extracted at the vertex (the Jeffery–Hamel problem). It is shown that the similarity solution in either case is valid only when 2α < 2α c ≈ 257·5 ° ; a modified problem is solved exactly revealing the behaviour when α > α c , and the transitional behaviour when α = α c (when the similarity solutions become infinite everywhere). An interesting conclusion for the Jeffery–Hamel problem is that when α > α c , inertia forces are of dominant importance throughout the flow field no matter how small the source Reynolds number 2 Q /ν may be." @default.
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- W1996169145 date "1980-01-29" @default.
- W1996169145 modified "2023-10-16" @default.
- W1996169145 title "Local similarity solutions and their limitations" @default.
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- W1996169145 doi "https://doi.org/10.1017/s0022112080002133" @default.
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