Measurement of Three-Dimensional Crossflow Separation

Wetzel, Todd G.; Simpson, Roger L.; Chesnakas, Christopher J.

doi:10.2514/2.429

Cited by 82 publications

(36 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The computational C p coefficients agree with the measurements very well although they are a little weaker at the second minimum, where ≈ 160 • , than those of experiments [2,3]; the second minimum of C p on Grid B is even weaker than that of Grid A. It is very difficult to predict the C f , because the transition in the 3-D separation flows is very complex.…”

Section: Effect On Gridssupporting

confidence: 61%

“…The flow transition includes not only the streamwise Tollmien-Schilichting (T-S) wave instability but also crossflow instability, which is lack of effective predictive tools with the transition models until now. The flows around prolate spheroid have been studied both experimentally [1][2][3] and computationally using Reynolds-averaged NavierStokes (RANS) with k-ε model of Tsi and Whiteney [4], detached eddy simulation (DES, [5]) based on S-A [6] model of Constantinescu et al [7], large-eddy simulation (LES) of Wikström et al [8] and so on. Deng and Zhuang [9] applied a novel Slightly Compressible Model (SCM) to predict the flows at a relative little AOA.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of separation flows around a 6:1 prolate spheroid using RANS/LES hybrid approaches

et al. 2007

View full text Add to dashboard Cite

This paper presents hybrid Reynolds-averaged Navier-Stokes (RANS) and large-eddy-simulation (LES) methods for the separated flows at high angles of attack around a 6:1 prolate spheroid. The RANS/LES hybrid methods studied in this work include the detached eddy simulation (DES) based on Spalart-Allmaras (S-A), Menter's k-ω shear-stress-transport (SST) and k-ω with weakly nonlinear eddy viscosity formulation (Wilcox-Durbin+, WD+) models and the zonal-RANS/LES methods based on the SST and WD+ models. The switch from RANS near the wall to LES in the core flow region is smooth through the implementation of a flow-dependent blending function for the zonal hybrid method. All the hybrid methods are designed to have a RANS mode for the attached flows and have a LES behavior for the separated flows. The main objective of this paper is to apply the hybrid methods for the high Reynolds number separated flows around prolate spheroid at high-incidences. A fourth-order central scheme with fourth-order artificial viscosity is applied for spatial differencing. The fully implicit lower-upper symmetric-Gauss-Seidel with pseudo time sub-iteration is taken as the temporal differentiation. Comparisons with available measurements are carried out for pressure distribution, skin friction, and profiles of velocity, etc. Reasonable agreement with the experiments, accounting for the effect on grids and fundamental turbulence models, is obtained for the separation flows.

show abstract

Section: Effect On Gridssupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Prediction of separation flows around a 6:1 prolate spheroid using RANS/LES hybrid approaches

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Wetzel et al [28] compares experimental methods for identifying the crossflow separation line. Many of these approaches are relevant for interrogation of RANS data sets.…”

Section: Separation Linementioning

confidence: 99%

Influence of turbulence closure models on the vortical flow field around a submarine body undergoing steady drift

2010

View full text Add to dashboard Cite

Manoeuvring underwater vehicles experience complex three dimensional flow. Features include stagnation and boundary layer separation along a convex surface. The resulting free vortex sheet rolls up to form a pair of streamwise body vortices. The track and strength of the body vortex pair results in a nonlinear increase in lift with as body incidence increases. Consequently, accurate capture of the body vortex pair is essential if the flow field around a manoeuvring submarine and the resulting hydrodynamic loading is to be correctly found. This work highlights the importance of both grid convergence and turbulence closure models on the strength and path of the crossflow induced body vortices experienced by the DOR submarine model at an incidence angle of 15 • . Five turbulence closure models are considered; Spalart-Allmaras, k − ε, k − ω, Shear Stress Transport and the SSG Reynolds stress model. The SSG Reynolds stress model shows potential improvements in predicting both the path and strength of the body vortex over standard one and two equation turbulence closure models based on an eddy viscosity approach.

show abstract

“…The results of the computation will be compared with the experimental data available in the literature [16,17,18,19,20,21,22]. The 6:1 prolate spheroid used for the measurements is 1.37 m long and the Reynolds number based on the spheroid length is 4.20?10 6 .…”

Section: Summary Of Prolate Spheroid Simulationsmentioning

confidence: 99%

Aero-Optics Code Development: Experimental Databases and AVUS Code Improvements

Sherer¹

2009

View full text Add to dashboard Cite

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.

show abstract

Measurement of Three-Dimensional Crossflow Separation

Cited by 82 publications

References 11 publications

Prediction of separation flows around a 6:1 prolate spheroid using RANS/LES hybrid approaches

Prediction of separation flows around a 6:1 prolate spheroid using RANS/LES hybrid approaches

Influence of turbulence closure models on the vortical flow field around a submarine body undergoing steady drift

Aero-Optics Code Development: Experimental Databases and AVUS Code Improvements

Contact Info

Product

Resources

About