By Mark V. Morkovin (auth.), D. E. Ashpis, T. B. Gatski, R. Hirsh (eds.)
This booklet comprises contributions by means of colleagues, former scholars and acquaintances of Professor Eli Reshotko in occasion of his sixtieth start day. given that Professor Reshotko's clinical and engineering contribu tions were within the parts of hydrodynamic balance, transition to turbulence, and boundary layer flows, it is just applicable that the articles during this quantity be dedicated to those and comparable issues. the 1st sections specialise in instabilities and transition in sub sonic and supersonic flows, respectively. The 3rd part bargains with constructing turbulence, whereas the the ultimate part treats comparable prob lems in engineering fluid mechanics. the range and scope of the articles contained herein exemplify the perception and services required within the research of transitional and turbulent flows this day - features which additionally exemplify Eli Reshotko's contributions to those fields. many of the articles during this quantity have been offered at a sym posium in honor of Eli Reshotko's sixtieth birthday, held in Newport information, Virginia, on July 28, 1991. The symposium used to be backed via lCASE, and arranged by way of M.Y. Hussaini (lCASE) and R. Hirsh (U.S. nationwide technological know-how Foundation). of these who couldn't attend, many selected to honor Professor Reshotko by way of a contribution to the amount devoted to him. we want to take advantage of this chance to precise our deep ap preciation to M.Y. Hussaini for starting up this very targeted tribute to Eli, and to Ms. Emily Todd for her efforts within the quantity instruction and within the association of the symposium.
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Extra info for Instabilities and Turbulence in Engineering Flows
Example text
Morkovin, M. , 1985b. "Guide to experiments on instability and laminar-turbulent transition," Textbook for AlA A short course, with L. Mack, June 1985. Also in the hands of participants of 2-week courses at NASA Ames, 1988, NASA Lewis, 1990, and NASA Langley, 1991. 04. 10, a to d, plus Figs. 37. Morkovin, M. , 1990a. "On roughness-induced transition: facts, views, and speculations," pp. 281-295 in Hussaini and Voigt, 1990. Morkovin, M. , 1990b. "Roughness panel summary," pp. 265-271 in Hussaini and Voigt, 1990.
Discussion The first part of this paper discussed the numerical evaluation of the Fourier transform of the streamfunction created by a time·· periodic points source on the boundary. The integrand was singular because the flow supported eigenmodes. This singular character made numerical evaluation difficult and a modified approach involving splitting the integrand into a regular portion, that could be treated numerically without difficulty, and a singular part that could be evaluated analytically, was used.
Again the full solution would be formed by a convolution. The receptivity plots showed that the variation in response with both Reynolds number and frequency of excitation are small, and provide some support for the neglect of this factor in the wave packet calculation presented by Gaster (1975). Many of the plots followed the character of the neutral stability loop to a surprising degree. This may well be because the viscous effects that arise from the wall layer have similar Reynolds number scaling in both the response and amplification, but some analysis is needed here to bring this feature out more clearly.