Summary
The classical regular perturbation problem of plane potential flow past a sinusoidal wall is pursued via series extension. Fifty terms of the series in non-dimensional wall height ε are produced by computer. Analysis reveals convergence to be limited by a branch point at ε=±i. The series is recast using an Euler transformation and also summed using Padé approximants to yield accurate answers for higher real values of ε.
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Whitley, N.L. Potential flow past a sinusoidal wall of finite amplitude. J Eng Math 18, 207–217 (1984). https://doi.org/10.1007/BF00039189
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DOI: https://doi.org/10.1007/BF00039189