Instability, Transition, and Turbulence by Stephen P. Wilkinson (auth.), M. Y. Hussaini, A. Kumar, C.

By Stephen P. Wilkinson (auth.), M. Y. Hussaini, A. Kumar, C. L. Streett (eds.)

This quantity comprises the lawsuits of the Workshop on In­ balance, Transition and Turbulence, backed via the Institute for computing device functions in technological know-how and Engineering (ICASE) and the NASA Langley examine heart (LaRC), in the course of July eight to August 2, 1991. this can be the second one workshop within the sequence at the topic. the 1st was once held in 1989, and its court cases have been released through Springer-Verlag lower than the identify "Instability and Transition" edited by way of M. Y. Hussaini and R. G. Voigt. The goals of those paintings­ retailers are to i) reveal the educational group to present technologically im­ portant problems with transition and turbulence in shear flows over the total pace diversity, ii) acquaint the educational group with the original blend of theoretical, computational and experimental functions at LaRC and foster interplay with those services, and iii) speed up development in elucidating the basic phenomena of transition and turbulence, resulting in more advantageous transition and turbulence modeling in layout methodologies. The study components lined in those lawsuits contain receptiv­ ity and roughness, nonlinear theories of transition, numerical simu­ lation of spatially evolving flows, modelling of transitional and completely turbulent flows in addition to a few experiments on instability and tran­ sition. moreover a one-day mini-symposium was once held to debate 1 fresh and deliberate experiments on turbulent circulation over a backward­ dealing with step.

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An oscillating flap located at the edge of the step was used to organize the vortical structure in the shear layer. Flow visualization techniques along with hot-wire anemometry were used to examine the structure of the shear layer both with and without excitation. Conclusions made from the research activities include: • Nominally two-dimensional vortical structures form and merge in the shear layer formed at the step • Shear-layer excitation is very effective in regularizing and enhancing vortical structure development.

N=('),-l)c. e. all the z-dependence of the fundamental vortex terms is contained within the factor (8) The Gortler number G (as defined by Hall, 1990) is written Q = lim M- 2 M-oo roo 1Jy 'd1J Jo (9) where ~(x) is the non-dimensional wall curvature and go '" 0(1). The term involving Q is due to the curvature of the basic state; its inclusion was shown to be necessary by Hall & Fu (1989). The inviscid, Rayleigh-type, modes are chosen to have streamwise wavenumber and frequency scaled on the TAL thickness; in fact, all of the x and t dependence of these modes is included in the factor (10) but note that we choose 0, n '" 0(1), so that the resulting eigenproblem for the inviscid modes has a solution.

J'..... 0 u'/u'(max) Figure 9. Comparison between eigenfunction moduli of n = 16 mode, and most amplified stationary mode at R = 300 from linear-parallel theory. HIGH SPEED BOUNDARY LAYER TRANSITION ON A BLUNT NOSE FLARE WITH ROUGHNESS Steven P. Schneiderl Purdue University West Lafayette, IN 47907 Ivan E. Beckwith George Washington University at NASA Langley Research Center Hampton, VA 23665 ABSTRACT A blunt nose flare model was designed and constructed and is to be tested in the Langley Mach 6 quiet tunnel.

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