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首页> 外文期刊>Zeitschrift fur Angewandte Mathematik und Mechanik >Homotopy analysis of unsteady boundary-layer flow started impulsively from rest along a symmetric wedge
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Homotopy analysis of unsteady boundary-layer flow started impulsively from rest along a symmetric wedge

机译:非平稳边界层流的同伦分析是从静止沿对称楔形开始的

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摘要

An investigation of the velocity boundary-layer growth resulting from all impulsively started wedge is presented in this paper. By introducing a new set of scaled coordinates, the governing equations describing the impulsively set into motion Falkner-Skan flows is transformed to a partial differential equation but the number of independent variables are reduced from three to two. Note that the new time scaling avoids the appearance of the singularity resulting from the logarithmic function ln (1-xi), thus reducing the difficulties of computations. Analytical approximations for the momentum boundary layer are obtained, which are valid for all time. The results are then matched numerically using the Keller-Box method. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
机译:本文研究了由所有脉冲启动楔引起的速度边界层增长。通过引入一组新的缩放坐标,将描述脉冲集的控制方程式转化为运动Falkner-Skan流,将其转换为偏微分方程,但是自变量的数量从三个减少为两个。注意,新的时间标度避免了对数函数ln(1-xi)引起的奇异现象的出现,从而减少了计算的难度。得到了动量边界层的解析近似值,该近似值对所有时间都有效。然后使用Keller-Box方法对结果进行数值匹配。 (C)2008 WILEY-VCH Verlag GmbH&Co. KGaA,Weinheim。

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