A numerical study of three-dimensional separated flow past a hemisphere cylinder

Ying, Susan X.; Schiff, Lewis B.; Steger, J. L.

doi:10.2514/6.1987-1207

Cited by 46 publications

(12 citation statements)

References 4 publications

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“…Research conducted on this problem up to 1982 was reviewed by Tobak & Peake (1982) and Peake & Tobak (1982). These efforts were followed by contributions of Meade & Schiff (1987) Ying et al (1986Ying et al ( , 1987, Wang & Hsieh (1992) and Hsieh & Wang (1996).…”

Section: Introductionmentioning

confidence: 99%

“…Ying et al (1987) demonstrated numerically the existence of vortex asymmetry over a hemisphere-cylinder model at 19°angle of attack and M "1)2 using the algorithm described in their 1986 paper. The present authors believe that there must be some sort of computational disturbance since no other computational or experimental evidence is available to support this finding.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Symmetric and Asymmetric Separation Patterns Over a Hemisphere Cylinder at Low Reynolds Numbers and High Incidences

Hoang

Rediniotis

Telionis

1997

Journal of Fluids and Structures

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Symmetric and Asymmetric Separation Patterns Over a Hemisphere Cylinder at Low Reynolds Numbers and High Incidences

Hoang

Rediniotis

Telionis

1997

Journal of Fluids and Structures

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“…As scientists have begun to study more convoluted flows, this approach has become increasingly inadequate. Some researchers [Ying et al 1987] have expressed these reservations:…”

Section: Streamlinesmentioning

confidence: 99%

“…As scientists have begun to study more convoluted flows, this approach has become increasingly inadequate. Some researchers [Ying et al 1987] have expressed these reservations:It should be pointed out that even with the relatively good graphics hardware and software at our disposal, the representation of details of the flow structures, and in particular the form of multi-coiled surfaces such as depicted here, remains open to judgment, and is subject to imprecision.Researchers ought to be working to understand their data; yet they often must work instead to understand their pictures! Careful use of depth cues can aid in the visual interpretation of streamlines.…”

mentioning

confidence: 99%

Interactive numerical flow visualization using stream surfaces

Hultquist

1990

Computing Systems in Engineering

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Interactive Numerical Flow Visualization Using Stream Surfaces(Under the direction of Frederick P. Brooks, Jr.)Three-dimensional steady fluid flows are often numerically simulated over multiple overlapping curvilinear arrays of sample points. Such flows are often visualized using tangent curves or streamlines computed through the interpolated velocity field.A stream surface is the locus of an infinite number of streamlines rooted at all points along a short line segment or rake. Stream surfaces can depict the structure of a flow field more effectively than is possible with mere streamline curves, but careful placement of the rakes is needed to most effectively depict the important features of the flow. I have built visualization software which supports the interactive calculation and display of stream surfaces in flow fields represented on composite curvilinear grids. This software exploits several novel methods to improve the speed with which a particle may be advected through a vector field. This is combined with a new algorithm which constructs adaptively sampled polygonal models of stream surfaces.These new methods make stream surfaces a viable tool for interactive numerical flow visualization. Software based ori these methods has been used by scientists at the 1.1.3Numerical Flow Visualization . . 185 Table 3.1 Relative performance of four differencing methods. 75 Table 3.2 Performance of mixed-spaced streamline computation .. 89 LIST OF TABLES COMPUTATIONAL FLUID DYNAMICSThe study of fluid flow is typically comprised of three phases: the construction of a grid of node points, the calculation of the flow field sample values at these points, and the post-process visualization of the resulting data. The requirements of the first two tasks motivate the use of unusual data structures, which pose difficulty for the interactive visualization of the results. Grid GenerationThe flow simulation effort begins with a description of the surface of an object, usually by a sequence of digitized cross-sections or a collection of surface spline patches. The object may be as simple as a sphere or as intricate as the Space ShuttleOrbiter with solid rocket boosters, external fuel tank, and interconnection hardware [Pearce et al. 1993]. Some volume surrounding the object is then tessellated into cells. These cells are small enough that the flow field may be expected to vary only slightly through each one. The partial differential equations which govern fluid flow are then discretized and numerically solved over the collection of points which are the vertices of these cells.In Finite Element Analysis, the cells of an unstructured computational grid may have a variety of shapes and each node point may be shared by any number of cells. These general cells can be easily positioned around intricate domain boundaries, but this generality requires increased bookkeeping during the simulation follow the curved contours of the vehicle surface. As a result, the six faces of each cell are not planar, but are instead...

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“…The hemisphere cylinder in Figure 3(a) has been used in both experimental and numerical studies of flow separation over an inclined body [17]. The surface flow pattern shown in Figures 3(a) and 3(b) was computed using a line integral convolution (LIC) program [2].…”

Section: Hemisphere Cylindermentioning

confidence: 99%

Automatic detection of open and closed separation and attachment lines

Kenwright

Proceedings Visualization '98 (Cat. No.98CB36276)

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A fully automatic feature detection algorithm is presented that locates, and distinguishes, lines of flow separation and attachment on surfaces in 3-D numerical flow fields. The algorithm is based on concepts from 2-D phase plane analysis of linear vector fields. Unlike prior visualization techniques based on particle tracing or flow topology, the phase plane algorithm detects separation using local analytic tests. Results show that it not only detects the standard closed separation lines but also the illusive open separation lines which are not captured by flow topology methods.

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A numerical study of three-dimensional separated flow past a hemisphere cylinder

Cited by 46 publications

References 4 publications

Symmetric and Asymmetric Separation Patterns Over a Hemisphere Cylinder at Low Reynolds Numbers and High Incidences

Symmetric and Asymmetric Separation Patterns Over a Hemisphere Cylinder at Low Reynolds Numbers and High Incidences

Interactive numerical flow visualization using stream surfaces

Automatic detection of open and closed separation and attachment lines

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