A. Guitton, Tinney, C. E., Jordan, P., and Delville, J., “Measurements in a co-axial subsonic jet,” 45th AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2007-0015, Reno, NV, 2007.PDF icon c2007aiaa-reno-0015.pdf
J. Bor´ee, Tinney, C. E., and Delville, J., “Extension de la POD `a l’analyse de mesures coupl´ees ou multi-domaines,” Assoc. Francophone de Velocim´etrie Laser, Futuro-scope, France. Futuro-scope, France, 2007.
C. E. Tinney, Bonnet, J. - P., and Delville, J., “Stochastic estimation: structure eduction techniques for turbulent flows and other dynamical systems,” in Schloss Dagstuhl Seminar–07121: Experimental fluid mechanics, computer vision and pattern recognition, Wadern, Germany, 2007.
C. E. Tinney, Glauser, M. N., and Ukeiley, L. S., “The fully low-dimensional characteristics of a subsonic jet flow,” Bulletin of the American Physical Society, Division of Fluid Dynamics, Tampa, FL, vol. 51. 2006.
H. Higuchi, van Langen, P., Sawada, H., and Tinney, C. E., “Axial flow over a blunt circular cylinder with and without shear layer reattachment,” Journal of Fluids & Structures, vol. 22, pp. 949–959, 2006.Abstract
Flow over a circular cylinder with its axis aligned with the free stream was investigated experimentally. Both upstream and downstream faces of the cylinder are sharply truncated. The fineness ratio (length to diameter ratio) was varied and the behavior of the leading-edge separating shear layer and its effect on the wake were studied in water using both flow visualization and PIV techniques. For the moderately large fineness ratio, the shear layer reattaches with subsequent boundary layer growth, whereas over a shorter cylinder the shear layer remains detached. This causes differences in the wake recirculation region and the immediate wake patterns. The shear layer structure was analyzed using the proper orthogonal decomposition (POD). The model in the water channel was sting-mounted and in some cases the effect of model support was detected in the wake measurements. To avoid such disturbance from the model support, an experiment was initiated in air using a magnetic model support and balance system. The drag variation with fineness ratio is presented and discussed in light of the flowfield measurements.
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C. E. Tinney, Glauser, M. N., Eaton, E., and Taylor, J. A., “Low-dimensional azimuthal characteristics of suddenly expanding axisymmetric flows,” Journal of Fluid Mechanics, vol. 567, pp. 141–155, 2006.Abstract
Two rakes of cross-wire probes were used to capture the two-point velocity statistics in a flow through an axisymmetric sudden expansion. The expansion ratio of the facility is 3, and has a constant geometry. Measurements were acquired at a Reynolds number equal to 54 000, based on centreline velocity and inlet pipe diameter. The two-point velocity correlations were obtained along a plane normal to the flow (r, θ), at eleven downstream step-height positions spanning from the recirculating region, through reattachment, and into the redeveloping region of the flow. Measurements were acquired by means of a flying-hot-wire technique to overcome rectification errors near the outer wall of the pipe where flow recirculations were greatest. A mixed application of proper orthogonal (in radius) and Fourier decomposition (in azimuth) was performed at each streamwise location to provide insight into the dynamics of the most energetic modes in all regions of the flow. This multi-point analysis reveals that the flow evolves from the Fourier-azimuthal mode m=2 (containing the largest amount of turbulent kinetic energy) in the recirculating region, to m=1 in the reattachment and redeveloping regions of the flow. An eigenvector reconstruction of the kernel, using the most energetic modes from the decomposition, displays the spatial dependence of the Fourier-azimuthal modes and the characteristics that govern the turbulent shear layer and recirculating regions of the flow.
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C. E. Tinney, Coiffet, F., Delville, J., Glauser, M., Jordan, P., and Hall, A., “On spectral linear stochastic estimation,” Experiments in Fluids, vol. 41, no. 5, pp. 763–775, 2006.Abstract
An extension to classical stochastic estimation techniques is presented, following the formulations of Ewing and Citriniti (1999), whereby spectral based estimation coefficients are derived from the cross spectral relationship between unconditional and conditional events. This is essential where accurate modeling using conditional estimation techniques are considered. The necessity for this approach stems from instances where the conditional estimates are generated from unconditional sources that do not share the same grid subset, or possess different spectral behaviors than the conditional events. In order to filter out incoherent noise from coherent sources, the coherence spectra is employed, and the spectral estimation coefficients are only determined when a threshold value is achieved. A demonstration of the technique is performed using surveys of the dynamic pressure field surrounding a Mach 0.30 and 0.60 axisymmetric jet as the unconditional events, to estimate a combination of turbulent velocity and turbulent pressure signatures as the conditional events. The estimation of the turbulent velocity shows the persistence of compact counter-rotating eddies that grow with quasi-periodic spacing as they convect downstream. These events eventually extend radially past the jet axis where the potential core is known to collapse.
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P. Jordan, Laurendeau, E., Guitton, A., Tinney, C. E., and Delville, J., “Interpreting the near pressure field of unbounded jets,” 10th Confederation of European Aerospace Societies - Aeroacoustics Specialists’ Committee (CEAS-ASC) Workshop. Trinity College, Dublin, Ireland, 2006.
C. E. Tinney, Jordan, P., Guitton, A., Delville, J., and Coiffet, F., “A study in the near pressure field of co-axial subsonic jets,” 27th AIAA Aeroacoustics Conference. AIAA Paper 2006-2589, Boston, MA, 2006.PDF icon c2006aiaa-cambridge-2589.pdf
C. E. Tinney, Jordan, P., Delville, J., Hall, A. M., and Glauser, M. N., “A time-resolved estimate of the turbulence and source mechanisms in a subsonic jet flow,” 44th AIAA Aerospace Sciences Meeting and Exhibit. AIAA Paper 2006-0621, Reno, NV, 2006.PDF icon c2006aiaa-reno-0621b.pdf
C. E. Tinney and Jordan, P., “The pressure field outside of co-axial round jets,” 1000 Islands Fluid Mechanics Meeting. Alexandria Bay, Canada, 2006.PDF icon a2006tim-tinney.pdf
P. J. Jordan and Tinney, C. E., “A study in the pressure field of co-axial subsonic jets,” Bulletin of the American Physical Society, Division of Fluid Dynamics, Tampa, FL, vol. 51. Tampa, FL, 2006.
C. E. Tinney, Glauser, M. N., and Ukeiley, L. S., “The evolution of the most energetic modes in a high subsonic Mach number turbulent jet,” 43rd AIAA Aerospace Sciences Meeting and Exhibit. AIAA Paper 2005-0417, Reno, NV, 2005.PDF icon c2005aiaa-reno-0417.pdf
A. M. Hall, N., G. M., and Tinney, C. E., “Experimental investigation of the pressure velocity correlation of a M=0.6 axisymmetric jet,” 35th AIAA Fluid Dynamics Conference and Exhibit. AIAA Paper 2005-5294, Toronto, Canada, 2005.PDF icon c2005aiaa-toronto-5294.pdf
A. M. Hall, Glauser, M. N., and Tinney, C. E., “An experimental investigation of the pressure-velocity cross-correlation in an axisymmetric jet,” ASME Fluids Engineering Division Summer Meeting and Exhibition. FEDSM2005-77338, Houston, TX, 2005.PDF icon c2005fedsm-houstonhall77338.pdf
A. M. Hall, Tinney, C. E., and Glauser, M. N., “Investigating the ‘modified’ Complementary Technique using pressure-velocity correlations of an axisymmetric jet,” 43rd AIAA Aerospace Sciences Meeting and Exhibit. AIAA Paper 2005-0039, Reno, NV, 2005.PDF icon c2005aiaa-reno-0039.pdf
P. Jordan, Tinney, C. E., Delville, J., Coiffet, F., Glauser, M. N., and Hall, A., “Low-dimensional signatures of the sound production mechanisms in subsonic jets: Towards their identification and control,” 35th AIAA Fluid Dynamics Conference and Exhibit. AIAA Paper 2005-4647 (Invited), Toronto, Canada, 2005.PDF icon c2005aiaa-toronto-4647.pdf
C. E. Tinney, “Quantifying the relationship between the reactive pressure field and the turbulent mixing layer surrounding the axisymmetric jet,” European Research Community on Flow, Turbulence and Combustion (ERCOFTAC), Summer workshop on compressible flows. Strasbourg, France, 2005.
C. E. Tinney, Hall, A., Glauser, M. N., Ukeiley, L. S., and Coughlin, T., “Designing an anechoic chamber for the experimental study of high speed heated jets,” 42nd AIAA Aerospace Sciences Meeting and Exhibit. AIAA Paper 2004-0010, Reno, NV, 2004.PDF icon c2004aiaa-reno-0010.pdf
C. E. Tinney, Ukeiley, L. S., and Glauser, M. N., “Noise identification in a Mach 0.85 jet using modified low-dimensional techniques,” in Advances in Turbulence X, Proceedings of the 10th European Turbulence Conference, H. I. Andersson and Krogstad, P. - A., Ed. Trondheim, Norway, 2004.PDF icon c2004etc-trondheimnw10.pdf