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Unsteady Three-Dimensional Marginal Separation, Including Breakdown

2018-07-15
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Release : 2018-07-15
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Book Synopsis Unsteady Three-Dimensional Marginal Separation, Including Breakdown by : National Aeronautics and Space Administration (NASA)

Download or read book Unsteady Three-Dimensional Marginal Separation, Including Breakdown written by National Aeronautics and Space Administration (NASA). This book was released on 2018-07-15. Available in PDF, EPUB and Kindle. Book excerpt: A situation involving a three-dimensional marginal separation is considered, where a (steady) boundary layer flow is on the verge of separating at a point (located along a line of symmetry/centerline). At this point, a triple-deck is included, thereby permitting a small amount of interaction to occur. Unsteadiness is included within this interaction region through some external means. It is shown that the problem reduces to the solution of a nonlinear, unsteady, partial-integro system, which is solved numerically by means of time-marching together with a pseudo-spectral method spatially. A number of solutions to this system are presented which strongly suggest a breakdown of this system may occur, at a finite spatial position, at a finite time. The structure and details of this breakdown are then described. Duck, Peter W. Glenn Research Center NASA ORDER C-99066-G; RTOP 505-62-21...

Unsteady Three-dimensional Marginal Separation, Including Breakdown

1990
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Release : 1990
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Book Synopsis Unsteady Three-dimensional Marginal Separation, Including Breakdown by :

Download or read book Unsteady Three-dimensional Marginal Separation, Including Breakdown written by . This book was released on 1990. Available in PDF, EPUB and Kindle. Book excerpt:

Three-Dimensional Marginal Separation

2018-07-13
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Release : 2018-07-13
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Kind : eBook
Book Rating : 029/5 ( reviews)

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Book Synopsis Three-Dimensional Marginal Separation by : National Aeronautics and Space Administration (NASA)

Download or read book Three-Dimensional Marginal Separation written by National Aeronautics and Space Administration (NASA). This book was released on 2018-07-13. Available in PDF, EPUB and Kindle. Book excerpt: The three dimensional marginal separation of a boundary layer along a line of symmetry is considered. The key equation governing the displacement function is derived, and found to be a nonlinear integral equation in two space variables. This is solved iteratively using a pseudo-spectral approach, based partly in double Fourier space, and partly in physical space. Qualitatively, the results are similar to previously reported two dimensional results (which are also computed to test the accuracy of the numerical scheme); however quantitatively the three dimensional results are much different. Duck, Peter W. Glenn Research Center SAA-C99066G; RTOP 505-62-21...

Unsteady Three-Dimensional Flow Separation

2018-07-15
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Release : 2018-07-15
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Kind : eBook
Book Rating : 379/5 ( reviews)

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Book Synopsis Unsteady Three-Dimensional Flow Separation by : National Aeronautics and Space Administration (NASA)

Download or read book Unsteady Three-Dimensional Flow Separation written by National Aeronautics and Space Administration (NASA). This book was released on 2018-07-15. Available in PDF, EPUB and Kindle. Book excerpt: A concise mathematical framework is constructed to study the topology of steady 3-D separated flows of an incompressible, or a compressible viscous fluid. Flow separation is defined by the existence of a stream surface which intersects with the body surface. The line of separation is itself a skin-friction line. Flow separation is classified as being either regular or singular, depending respectively on whether the line of separation contains only a finite number of singular points or is a singular line of the skin-friction field. The special cases of 2-D and axisymmetric flow separation are shown to be of singular type. In regular separation it is shown that a line of separation originates from a saddle point of separation of the skin-friction field and ends at nodal points of separation. Unsteady flow separation is defined relative to a coordinate system fixed to the body surface. It is shown that separation of an unsteady 3-D incompressible viscous flow at time t, when viewed from such a frame of reference, is topologically the same as that of the fictitious steady flow obtained by freezing the unsteady flow at the instant t. Examples are given showing effects of various forms of flow unsteadiness on flow separation. Hui, W. H. Unspecified Center NAGW-575; RTOP 505-31-01-01...

Scientific and Technical Aerospace Reports

1995 Aeronautics
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Release : 1995
Genre : Aeronautics
Kind : eBook
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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by . This book was released on 1995. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

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