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Unsteady non-similarity boundary-layer flows caused by an impulsively stretching flat sheet. (English) Zbl 1206.35208
Summary: The unsteady non-similarity boundary-layer flows caused by an impulsively stretching flat sheet have been investigated. The partial differential equations governing the flows have been solved analytically by means of an analytic technique for strongly non-linear problems, namely the homotopy analysis method (HAM). This analytic approach gives us the convergent series solution uniformly valid for all dimensionless time in the whole spatial region $$0\leq x<\infty$$ and $$0\leq y<\infty$$. To the best of our knowledge, such a kind of series solution has never been obtained. The skin friction coefficient and the boundary-layer thickness are also analyzed for different dimensionless time $$\tau$$.

##### MSC:
 35Q35 PDEs in connection with fluid mechanics 35C20 Asymptotic expansions of solutions to PDEs 76D10 Boundary-layer theory, separation and reattachment, higher-order effects 35B30 Dependence of solutions to PDEs on initial and/or boundary data and/or on parameters of PDEs
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