Instabilities and Turbulence in Engineering Flows by Mark V. Morkovin (auth.), D. E. Ashpis, T. B. Gatski, R.

By Mark V. Morkovin (auth.), D. E. Ashpis, T. B. Gatski, R. Hirsh (eds.)

This ebook comprises contributions by means of colleagues, former scholars and neighbors of Professor Eli Reshotko in get together of his sixtieth delivery­ day. given that Professor Reshotko's medical and engineering contribu­ tions were within the parts of hydrodynamic balance, transition to turbulence, and boundary layer flows, it is just acceptable that the articles during this quantity be dedicated to those and comparable issues. the 1st sections concentrate on instabilities and transition in sub­ sonic and supersonic flows, respectively. The 3rd part offers with constructing turbulence, whereas the the ultimate part treats similar 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 at the present time - characteristics which additionally exemplify Eli Reshotko's contributions to those fields. the various 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 by way of lCASE, and arranged by way of M.Y. Hussaini (lCASE) and R. Hirsh (U.S. nationwide technology Foundation). of these who couldn't attend, many selected to honor Professor Reshotko through a contribution to the amount devoted to him. we want to take advantage of this chance to specific our deep ap­ preciation to M.Y. Hussaini for beginning this very detailed tribute to Eli, and to Ms. Emily Todd for her efforts within the quantity training and within the association of the symposium.

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The plots on Figures 11 and 12 are based on the streamwise velocity fluctuations at the inner and outer maxima of these quantities. Both sets of results show the amplitude response in (a) and the relative phase in (b). Again a reasonable flat response is found together with a small phase lag. 7 radians. 12 shows some scatter because of the difficulty in identifying the inner peak there - the rough position of the contour is shown cross-hatched. 6. 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.

H. Schroeder, Numbrecht, Germany, SpringerVerlag, 365. , 1965, J. , Vol. 22,433. , 1975, Proc. Roy. Soc. A, Vol. 347,271. Schubauer, G. B. & Skramstad, H. , 1947, NACA Tech. Rep. No. 909. THE PREFERRED SPANWISE WAVENUMBER IN SUBHARMONIC-TYPE TRANSITION Reda R. M ankbadi National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio 44135 ABSTRACT Considered here is the interaction among detuned triad of waves comprising a plane fundamental wave and a pair of subharmonic oblique waves with spanwise wavenumber that could be different from that required for exact resonance.

S. and Tidstrom, K. , 1972. "Mechanism by which a two-dimensional roughness element induces boundary layer transition," Phys. Fluids 15, pp. 1173-1188. Kleiser, L. , 1991. , 23, pp. 495-537. Kosorygin, V. S. and Polyakov, N. , 1990. "Laminar boundary layers in turbulent flows," pp. 573-578 in Arnal and Michel, 1990. 28 Kovasznay, L. S. , and Blackwelder, R. , 1970. "Large-scale motion in the intermittent region of a turbulent boundary layer," J. Fluid Meeh. 41, p. 283. Landahl, M. , 1980. "A note on algebraic instability of inviscid parallel shear flows," J.

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