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Nonlinear Spatial Evolution Of Inviscid Instabilities On Hypersonic Boundary Layers
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Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781729390771 Total Pages :58 pages Book Rating :4.3/5 (97 download)
Book Synopsis Nonlinear Spatial Evolution of Inviscid Instabilities on Hypersonic Boundary Layers by : National Aeronautics and Space Adm Nasa
Download or read book Nonlinear Spatial Evolution of Inviscid Instabilities on Hypersonic Boundary Layers written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-29 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spatial development of an initially linear vorticity-mode instability on a compressible flat-plate boundary layer is considered. The analysis is done in the framework of the hypersonic limit where the free-stream Mach number M approaches infinity. Nonlinearity is shown to become important locally, in a thin critical layer, when sigma, the deviation of the phase speed from unity, becomes o(M(exp -8/7)) and the magnitude of the pressure fluctuations becomes 0(sigma(exp 5/2)M(exp 2)). The unsteady flow outside the critical layer takes the form of a linear instability wave but with its amplitude completely determined by the nonlinear flow within the critical layer. The coupled set of equations which govern the critical-layer dynamics reflect a balance between spatial-evolution, (linear and nonlinear) convection and nonlinear vorticity-generation terms. The numerical solution to these equations shows that nonlinear effects produce a dramatic reduction in the instability-wave amplitude. Wundrow, David W. Glenn Research Center...
Book Synopsis Nonlinear Spatial Evolution of Inviscid Instabilities on Hypersonic Boundary Layers by :
Download or read book Nonlinear Spatial Evolution of Inviscid Instabilities on Hypersonic Boundary Layers written by and published by . This book was released on 1996 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spatial Evolution of Nonlinear Acoustic Mode Instabilities on Hypersonic Boundary Layers by :
Download or read book Spatial Evolution of Nonlinear Acoustic Mode Instabilities on Hypersonic Boundary Layers written by and published by . This book was released on 1989 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-equilibrium Effects on Hypersonic Boundary Layers and Inviscid Stability by : Mary L. Hudson
Download or read book Non-equilibrium Effects on Hypersonic Boundary Layers and Inviscid Stability written by Mary L. Hudson and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Evolution of the First Mode Supersonic Oblique Waves in Compressible Boundary Layers by : J. S. B. Gajjar
Download or read book Nonlinear Evolution of the First Mode Supersonic Oblique Waves in Compressible Boundary Layers written by J. S. B. Gajjar and published by . This book was released on 1993 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Instability of Hypersonic Flow Past a Flat Plate by : Institute for Computer Applications in Science and Engineering
Download or read book On the Instability of Hypersonic Flow Past a Flat Plate written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The instability of hypersonic boundary-layer flows over flat plates is considered. The viscosity of the fluid is taken to be governed by Sutherland's law, which gives a much more accurate representation of the temperature dependence of fluid viscosity at hypersonic speeds than Chapmans's approximate linear law; although at lower speeds the temperature variation of the mean state is less pronounced so that the Chapman law can be used with some confidence. Attention is focussed on the so-called vorticity mode of instability of the viscous hypersonic boundary layer. The instability of the hypersonic boundary layer is non-interactive. The vorticity mode of instability of this flow operates on a significantly different lengthscale than that obtained if a Chapman viscosity law is assumed. The growth rate predicted by a linear viscosity law overestimates the size of the growth rate by O (M-sq). Next, the development of the vorticity mode as the wavenumber decreases is described, and it is shown that acoustic modes emerge when the wavenumber has decreased from it's O(1) initial value to O (M to the -3/2 power). (jhd).
Book Synopsis Nonlinear Instability of Hypersonic Flow Past a Wedge by : Institute for Computer Applications in Science and Engineering
Download or read book Nonlinear Instability of Hypersonic Flow Past a Wedge written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1991 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hypersonic Inviscid Flow by : Wallace D. Hayes
Download or read book Hypersonic Inviscid Flow written by Wallace D. Hayes and published by Courier Corporation. This book was released on 2012-07-13 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unified, self-contained view of nonequilibrium effects, body geometries, and similitudes available in hypersonic flow and thin shock layer; appropriate for graduate-level courses in hypersonic flow theory. 1966 edition.
Book Synopsis On the Nonlinear Three-dimensional Instability of Stokes Layers and Other Shear Layers to Pairs of Oblique Waves by : Xuesong Wu
Download or read book On the Nonlinear Three-dimensional Instability of Stokes Layers and Other Shear Layers to Pairs of Oblique Waves written by Xuesong Wu and published by . This book was released on 1992 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical Inviscid Stability Analysis of the Hypersonic Boundary Layer by : Daniel Richard Bower
Download or read book Analytical Inviscid Stability Analysis of the Hypersonic Boundary Layer written by Daniel Richard Bower and published by . This book was released on 1996 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Developments in Turbulence Management by : K.-S. Choi
Download or read book Recent Developments in Turbulence Management written by K.-S. Choi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: The European Drag Reduction Meeting has been held on 15th and 16th November 1990 in London. This was the fifth of the annual European meetings on drag reduction in engineering flows. The main objective of this meeting was to discuss up-to-date results of drag reduction research carried out in Europe. The organiser has adopted the philosophy of discussing the yesterday's results rather than the last year's results. No written material has therefore been requested for the meeting. It was only after the meeting the submission of papers was requested to the participants, from which 16 papers were selected for this proceedings volume. The meeting has attracted a record number of participants with a total of 52 researchers from seven European countries, U. K. , France, Germany, the Netherlands, Italy, Switzerland and U. S. S. R. as well as from Japan, Canada and Australia. The subjects covered in this proceedings volume include riblets, LEBUs (Large Eddy Break-Up device), surface roughness, compliant surfaces and polymer additives. Riblets seem to be one of the most extensively studied devices in the past years. Reflecting this situation in the European community, there are six papers on riblets covering their practical applications to aircraft and to a model ship, near-wall coherent structure of the boundary layer and effects of flow three-dimensionality. Possibility of heat-transfer enhancement with riblets and potential use in the laminar flow are also investigated. An analytical model is developed for the boundary-layer with a LEBU device.
Book Synopsis Nonparallel Instability of Supersonic and Hypersonic Boundary Layers by : Nabil M. El-Hady
Download or read book Nonparallel Instability of Supersonic and Hypersonic Boundary Layers written by Nabil M. El-Hady and published by . This book was released on 1991 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Inviscid Stability of Supersonic Flow Past Heated Or Cooled Axisymmetric Bodies by : Institute for Computer Applications in Science and Engineering
Download or read book The Inviscid Stability of Supersonic Flow Past Heated Or Cooled Axisymmetric Bodies written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory and Computation in Hydrodynamic Stability by : W. O. Criminale
Download or read book Theory and Computation in Hydrodynamic Stability written by W. O. Criminale and published by Cambridge University Press. This book was released on 2018-12-06 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers modern and numerical techniques for the stability of fluid flow with illustrations, an extensive bibliography, and exercises with solutions.
Book Synopsis Laminar-Turbulent Transition by : H.F. Fasel
Download or read book Laminar-Turbulent Transition written by H.F. Fasel and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origins of turbulent flow and the transition from laminar to turbulent flow are among the most important unsolved problems of fluid mechanics and aerodynamics. Besides being a fundamental question of fluid mechanics, there are any number of applications for information regarding transition location and the details of the subsequent turbulent flow. The JUT AM Symposium on Laminar-Turbulent Transition, co-hosted by Arizona State University and the University of Arizona, was held in Sedona, Arizona. Although four previous JUT AM Symposia bear the same appellation (Stuttgart 1979, Novosibirsk 1984, Toulouse 1989, and Sendai 1994) the topics that were emphasized at each were different and reflect the evolving nature of our understanding of the transition process. The major contributions of Stuttgart 1979 centered on nonlinear behavior and later stages of transition in two-dimensional boundary layers. Stability of closed systems was also included with Taylor vortices in different geometries. The topics of Novosibirsk 1984 shifted to resonant wave interactions and secondary instabilities in boundary layers. Pipe- and channel-flow transition were discussed as model problems for the boundary layer. Investigations of free shear layers were presented and a heavy dose of supersonic papers appeared for the first time. The character of Toulouse 1989 was also different in that 3-D boundary layers, numerical simulations, streamwise vortices, and foundation papers on receptivity were presented. Sendai 1994 saw a number of papers on swept wings and 3-D boundary layers. Numerical simulations attacked a broader range of problems.
