Measurement of three-dimensional crossflow separation

Wetzel, Todd G.; Chesnakas, Christopher J.

doi:10.2514/3.13861

Cited by 9 publications

(16 citation statements)

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“…The the pressure side to the suction side of the blade and passes through local minima skin friction locations across the separation. (Wetzel et al, 1998). The mean velocity perpendicular to this separation line is zero, as confirmed by LDA 3.4 THE CALIBRATION OF THE SEPARATION measurements.…”

Section: Comparison Of Oil Flow Visualizations and Ldv Resultssupporting

confidence: 54%

“…At the end of last century, experimental study, more accurate computational models due to the limitation of the experiment technology, most can be developed with the resulting benefit of better of the investigations on axial compressor flow fields initial designs of rotors. Research on the were concerned with the rotor wake characteristics and (Wetzel et al, 1998), the width of the dark region around the separation line is probably due to the low frequency unsteadiness of the tip leakage vortex.…”

Section: Itfc=027mentioning

confidence: 99%

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The Near-Wall Behavior of Unsteady Vortical Flow Around the Tip of an Axial Pump Rotor Blade

Simpson

2003

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Section: Comparison Of Oil Flow Visualizations and Ldv Resultssupporting

confidence: 54%

Section: Itfc=027mentioning

confidence: 99%

The Near-Wall Behavior of Unsteady Vortical Flow Around the Tip of an Axial Pump Rotor Blade

Simpson

2003

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“…The lack of a unique separation line and surface in crossflow separation has also been noted by Han & Patel (1979), Yates & Chapman (1992) and Wetzel, Simpson & Chesnakas (1998). As a well-defined separation structure in such problems, one may instead choose the one-dimensional separation profile emanating from the attracting skin-friction zero (see figure 19(c) for an example).…”

Section: Prior Work On Open Separationmentioning

confidence: 98%

Exact theory of three-dimensional flow separation. Part 1. Steady separation

Surana¹,

Grunberg²,

Haller³

2006

J. Fluid Mech.

131

107

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We derive an exact theory of three-dimensional steady separation and reattachment using nonlinear dynamical systems methods. Specifically, we obtain criteria for separation points and separation lines on fixed no-slip boundaries in compressible flows. These criteria imply that there are only four basic separation patterns with welldefined separation surfaces. We also derive a first-order prediction for the separation surface using wall-based quantities; we verify this prediction using flow models obtained from local expansions of the Navier-Stokes equations.

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“…The flow around a prolate spheroid separates on the lee side of the body and forms a surface that rolls into a vortex. Thus, skin friction lines on either side of the separation converge asymptotically toward the separation line 34 . At high angles of attack secondary separation might occur at a higher circumferential angle.…”

Section: A Results For a 6:1 Prolate Spheroidmentioning

confidence: 91%

Separated Turbulent Flow Simulations Using a Reynolds Stress Model and Unstructured Meshes

Alpman

Long

2005

43rd AIAA Aerospace Sciences Meeting and Exhibit

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Numerical simulation of three-dimensional, separated, high Reynolds number turbulent flows is performed using a second-order accurate cell-centered finite volume method on unstructured meshes. The computations include an application of Reynolds Stress Modeling (RSM), which consists of coupling the Reynolds transport equations with the Favre averaged Navier-Stokes Equations. The resulting system of 12 coupled, non-linear partial differential equations is solved using PUMA_RSM which is an in-house an unstructured grid computational fluid dynamics code written in ANSI-C++. Computations are performed on unstructured meshes composed of tetrahedral cells. In order to reduce the CPU time and memory requirements, parallel processing is applied with the MPI (Message Passing Interface) communication standard. The resulting parallel code is run on Beowulf clusters. Results for high Reynolds number flow around a 6:1 prolate spheroid and a sphere are presented and compared with experimental results. In the prolate spheroid case predictions of mean pressure and circumferential locations of cross flow separation points are in good agreement with experiment. The locations of primary and secondary separation points are computed with an error of roughly three degrees. Mean pressure and skin friction predictions for sphere solutions are also in good agreement with the measurements. The computed separation location is very close to the measured one. The distribution of turbulent stresses shows that the turbulent flow around a sphere is highly anisotropic and supports the notion that using anisotropic turbulence models are necessary for threedimensional separated flows.

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Measurement of three-dimensional crossflow separation

Cited by 9 publications

References 0 publications

The Near-Wall Behavior of Unsteady Vortical Flow Around the Tip of an Axial Pump Rotor Blade

The Near-Wall Behavior of Unsteady Vortical Flow Around the Tip of an Axial Pump Rotor Blade

Exact theory of three-dimensional flow separation. Part 1. Steady separation

Separated Turbulent Flow Simulations Using a Reynolds Stress Model and Unstructured Meshes

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