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Extending the utility of perturbation series in problems of laminar flow in a porous pipe and a diverging channel. (English) Zbl 0956.76074
The author applies Taylor series to obtain approximate solutions for steady inviscid incompressible flows first in a porous pipe, and then in an exponentially diverging asymmetric channel (in boundary-layer approximation). Using the symbolic algebra package Maple, the author calculates in the former case the first 54 coefficients, and in the latter case 44 coefficients, which allows to determine the radii of convergence and, employing a recent technique developed by {\it P. G. Drazin} and {\it Y. Tourigny} [SIAM J. Appl. Math. 56, No. 1, 1-18 (1996; Zbl 0858.65048)], to investigate the bifurcation diagrams and the position of flow separation.

76M45Asymptotic methods, singular perturbations (fluid mechanics)
76S05Flows in porous media; filtration; seepage
76D10Boundary-layer theory, separation and reattachment, etc. (incompressible viscous fluids)
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