Abstract
In this article, we derive an asymptotic approximation to the eigenvalue relation for boundary-layer flows with a relative error of order (αRe)−1/2 using only first-order outer (WKB) approximations which are valid in the “complete” sense. This approximation involves only elementary transcendental functions and it appears to be capable of providing an accurate global description of both the temporal and spatial spectra for flows of boundary-layer type.
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