Secondary instabilities in compressible boundary layers

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National Aeronautics and Space Administration, Langley Research Center , Hampton, Va
Ultrasonic w
StatementLian Ng, G. Erlebacher.
SeriesICASE report -- no. 90-58., NASA contractor report -- 182091., NASA contractor report -- NASA CR-182091.
ContributionsErlebacher, Gordon, 1957-, Langley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15382981M

Spatially Developing Secondary Instabilities in Compressible Swept Airfoil Boundary Layers Fei Li and Meelan M. Choudhari NASA Langley Research Center, Hampton, VA Two-dimensional eigenvalue analysis is used on a massive scale to study spatial instabilities of compressible shear flows with two inhomogeneous directions.

The next two instabilities in the cascade are usually called secondary and tertiary instabilities. Two approaches of treating secondary instability are reviewed and compared.

The first approach is a mutual interaction approach which accounts for the influence of the secondary Cited by: 5. The secondary instability mechanisms in a two‐dimensional (2‐D) compressible boundary layer over a flat plate have been examined for a range of Mach numbers up to For Secondary instabilities in compressible boundary layers book and low supersonic flows, fundamental resonance dominates when the amplitude of the (2‐D) primary disturbance is high, while subharmonic resonance prevails in an environment with a low primary by: COVID Resources.

Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Two-dimensional eigenvalue analysis is used on a massive scale to study the spatial instabilities of compressible shear flows with two inhomogeneous directions. The main focus of the study is crossflow dominated swept-wing boundary layers although the methodology can also be applied to study other types of flows, such as the attachment-line Secondary instabilities in compressible boundary layers book.

Certain unique aspects of formulating a Cited by: They note the mechanism to bear similarity to the secondary instabilities in boundary layer natural transition in Ref.

[35], i.e., bypass transition defined as the primary instability in natural. The breakdown of oblique waves has been found to cause rapid transition in compressible boundary- (Fasel & Thumm, ) and shear layers (Gathmann et al., ) and in channel flows (Schmid.

In laminar hypersonic boundary layers, it is known that secondary instability plays a crucial role in transition to turbulence. Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all “ Secondary instabilities in compressible boundary layers,” Phys.

secondary modes, is pursued in this paper to quantify the growth potential of the different types of secondary instabilities associated with second mode primary disturbances in hypersonic boundary layers. The results obtained for selected canonical high-speed boundary layers are described in Section 2 below.

ConcludingFile Size: KB. lying the concept of the boundary layer, however, still apply. Therefore the simplifications involved in the com­ pressible boundary layer theory can be carried out analo­ gously as that of the incompressible boundary layer theory.

The problem of the compressible boundary layer about a rotating axisymmetric body was treated by Illingworth.^11^. TECHNICAL PAPERS. Numerical investigation of the three-dimensional secondary instabilities in the time-developing compressible mixing layer.

Ricardo A. Coppola Germanos I; Leandro Franco de Souza II; Marcello A. Faraco de Medeiros III. I [email protected], University of São Paulo - de Engenharia de São Carlos- EESC São Carlos, SP, Brazil.

Read "Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers Mechanisms and Flow Control on Laminar-Turbulent Transition" by Jie Ren available from Rakuten Kobo. This thesis first reveals the mechanism of Görtler instabilities and then demonstrates how transitions at hypersonic flBrand: Springer Singapore.

In this post I go over the numerical solution to the compressible boundary layer equations.

Description Secondary instabilities in compressible boundary layers EPUB

This is very useful when a quick estimate of shear stress, wall heat flux, or boundary layer height if necessary. The sections of this post are: Introduction Compressibility transformation Using the general parabolic form Numerical solution using Crank-Nicolson Results and comparison.

The major contributions of Stuttgart 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 shifted to resonant wave interactions and secondary instabilities in boundary : $ Boundary-Layer Stability and Transition W.

Saric Arizona State University Tempe, USA Abstract Within the last five years, increased emphasis on secondary instability analysis along with the experimental observations of subharmonic instabilities have changed the picture of the transition process for boundary layers in low-disturbance.

Accordingly, the compressible boundary layer has been the object of intensive study, beginning with Prandtll. Some specialisation has been almost unavoidable. Mathematically, even in the two-dimensional case one faces the tremendous task of solving two coupled non-linear partial differential equations, and File Size: 2MB.

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2: Fundamental Aspects Secondary and Cascade Resonant Instabilities of Boundary Layers. Wave-Resonant Concept of a Breakdown and its Substantiation.- Nonlinear Breakdowns in Boundary Layer Transition.- Threshold Conditions for Breakdown of Laminar Boundary Layers.- Propagation of Wave Packets in the Boundary Layer on a Curved Surface Channel Flow of a Compressible Fluid: Vorticity: Fundamentals of Boundary Layers: Turbulence: Boundary-Layer Control: Secondary Flow: Waves in Fluids: Flow Instabilities: Cavitation: Rarefied Gas Dynamics: Stratified Flow: Rotating Flows: Aerodynamic Generation of Sound: Magnetohydrodynamics.

The Turbulent Boundary Layer in Compressible Flow W. CoP~, M.A., E., of the Engineering Division, N.P.L. Reports and Memoranda No. 28¢o* November, SummaryThe flow of a compressible gas past a fiat plate is investigated for a turbulent boundary layer.

TheFile Size: KB. The subjects cover laminar, transitional and turbulent boundary layers for two- and three-dimensional incompressible and compressible flows. The viscous-inviscid coupling between the boundary layer and the inviscid flow is also addressed. The book has a large number of homework : Hardcover.

InAscher Shapiro founded the National Committee for Fluid Mechanics Films (NCFMF) in cooperation with the Education Development Center and released a series of 39 videos and accompanying texts which revolutionized the teaching of fluid mechanics.

MIT's iFluids program has made a number of the films from this series available on the web. (Download / Purchase information.). We consider compressible boundary layer flows with Re δ * (x) ∈ [, ] at upstream Mach numbers Ma ∞ = and The incompressible boundary layer flow over a flat plate configuration is, in the range of Re δ * (x) considered, convectively unstable, and has been addressed in.Cited by: 1.

@article{osti_, title = {SUPERSONIC SHEAR INSTABILITIES IN ASTROPHYSICAL BOUNDARY LAYERS}, author = {Belyaev, Mikhail A and Rafikov, Roman R., E-mail: [email protected]}, abstractNote = {Disk accretion onto weakly magnetized astrophysical objects often proceeds via a boundary layer (BL) that forms near the object's surface, in which the rotation.

The topics of Novosibirsk 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 adjoint solution within the boundary layer upstream of the splitter-plate trailing edge reveals a mechanism for transfer of energy from boundary-layer stability modes to Kelvin-Helmholtz modes.

Extension of the adjoint solution to the more» far field using a Kirchhoff surface gives the receptivity of the mixing layer to incident sound. () Numerical analysis of secondary instabilities of the incompressible boundary layer flow with suction.

International Journal for Numerical Methods in Fluids() A numerical study of flow through wavy-walled by: A boundary layer, and its governing equations, can be thought in an input/output fashion.

Inputs. Initial conditions and boundary conditions. Outputs. Flow field, which can be measured by a norm. Zuccher, S., Tumin, A., Reshotko, E., Optimal Disturbances in Compressible Boundary Layers – Complete Energy Norm Analysis, Paper AIAA Similarity solutions for small cross flows in laminar compressible boundary layers, ([Washington, U.S.

G.P.O.], ), by Ivan E. Beckwith (page images at HathiTrust) A theoretical method for the analysis and design of axisymmetric bodies / (Washington, D.C. Wings and Wing-Body Combinations in Compressible Flow. The Dynamics of Viscous Fluids.

Incompressible Laminar Flow in Tubes and Boundary Layers. Laminar Boundary Layers in Compressible Flow. Flow Instabilities and Transition from Laminar to Turbulent Flow. Turbulent Flows. Airfoil Design, Multiple Surfaces, Vortex Lift, Secondary Flows, Viscous. ow in boundary layers. At vari-ous levels of modeling the featuring physical phenomena will be described.

Also, numerical methods to solve the equations of motion in the boundary layer are discussed. Outside the boundary layer the ow can be considered inviscid File Size: 2MB.

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The subject of laminar-turbulent transition is of considerable practical importance and has a wide range of engineering applications. For this reason, the International Union of Applied Mechanics decided to sponsor a third Symposium on "Laminar-Turbulent Transition", which would be organised by the ONERA Toulouse Research Center and held at "Ecole Nationale Superieure de l'Aeronautique et de l.Compressible turbulent boundary layers with free-stream Mach number ranging from up to 20 are analyzed by means of direct numerical simulation of the Navier–Stokes equations.

The fluid is assumed to be an ideal gas with constant specific heats. The simulation generates its inflow.The major contributions of Stuttgart 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 shifted to resonant wave interactions and secondary instabilities in boundary layers.