170,538 research outputs found
Doolan, C F, SX9917
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/382270Surname: DOOLAN. Given Name(s) or Initials: C F. Military Service Number or Last Known Location: SX9917. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 30914.213323
Item: [2016.0049.14563] "Doolan, C F, SX9917
Tandem cylinder flow and noise predictions using a hybrid RANS/LES approach
Full text linkThe performance of a novel hybrid RANS/LES methodology for accurate flow and noise predictions of the NASA Tandem Cylinder Experiment is investigated. The proposed approach, the modified Flow Simulation Methodology (FSM), is based on scaling the turbulence viscosity and the turbulence kinetic energy dissipation rate with a damping function. This damping function consists of three individual components, a function based on the Kolmogorov length-scale ensuring correct behaviour in the direct numerical simulation (DNS) limit, a function ensuring that FSM provides the correct damping in large-eddy simulation (LES) mode, and a shielding function that forces the switch from Reynolds-Averaged Navier–Stokes (RANS) to LES to occur outside the boundary layer. The FSM is proposed for the kω-SST two-equation model (FSM-SST) and for an Explicit-Algebraic-Stress-Model (FSM-EASM), which is better suited to resolve anisotropy and non-equilibrium of the unresolved scales and the strain and rotation-rate dependent coefficients introduce a dynamic response of the model to the resolved flow field. Simulations are performed on a relatively coarse grid and the FSM data are compared with results obtained from the Scale-Adaptive-Simulation (SAS) and IDDES approaches. Acoustic predictions are obtained using an acoustic analogy approach based on Curle’s theory. The FSM-SST approach was found to predict the hydrodynamic field in very good agreement with reference data, whereas the FSM-EASM did not improve the predictions. The acoustic spectra predicted show good agreement with experimental results at various microphone positions, with some deficiencies in capturing the broadband noise levels at high Strouhal numbers
Numerical evaluation and optimization of low speed wind tunnel contractions
No full textCon J. Doolan and Rick C. Morgan
Enhancing the focal-resolution of aeroacoustic time-reversal using a point sponge-layer damping technique
No full textAbstract not availableA. Mimani, C. J. Doolan, and P. R. Medwel
Doolan J. C., "Geys morg heiti hafi pér gefit honum"
No full textDoolan J. C., "Geys morg heiti hafi pér gefit honum" : the mutability of Óðinn as a literary device in Old Norse texts of the thirteenth and fourteenth centuries, Thèse de doctorat soutenue en 2011, (Université de Cambridge) Résumé/abstract : This dissertation presents the thesis that the literary figure of Óðinn was an extremely useful artistic device for medieval Icelandic authors seeking to engage with their pagan heritage and to reconcile an interest in this cultural past with their own ..
Unsteady Reynolds Averaged Simulation of the Passive Scalar Field in the Near Wake of a Circular Cylinder
No full textCon Doolan and J. M
Hypersonic vehicle control using external burning
No full textC.J. Doolan and V.Wheatleyhttp://www.mech.uq.edu.au/conferences/ACS2009/index.ht
An anechoic wind tunnel for the investigation of the main-rotor/tail-rotor blade vortex interaction
No full textCopyright © 2007 by the American Helicopter Society International, Inc. All rights reserved.Con Doolan and Damien Leclerc
AN EXPERIMENTAL INVESTIGATION OF TURBULENT BOUNDARY- LAYER INTERACTION WITH DIFFERENT SERRATED TRAILING-EDGE CONFIGURATIONS
Full text linkThe paper presents an experimental investigation of a turbulent boundary-layer interaction over a single large triangular serration at the Trailing-Edge (TE) of an airfoil on the flow-induced noise. Experiments were conducted at low-to-moderate Reynolds number given by 1.8 105 < Rec < 5.7 105, where c is the chord of airfoil. Six different TE serration geometries were studied: Three serrations with a single large triangular geometry at the TE, two serrations with varying orientation relative to the airfoil, and a straight-edged reference plate (in which the TE triangular serration is not considered). The airfoils with different TE configurations were placed in an anechoic wind tunnel in a
mean flow field with free-stream velocities of 25, 30 and 35 ms1. The radiated acoustic pressure field was recorded using a spiral microphone array located in the far-field. It was found that a significant noise reduction up to 6 dB was obtained when the included angle of the triangular serration was less
than 45,which was in agreement with Howe’s theory. The Conventional Beamforming (CB) source maps confirmed that the noise reduction was obtained by varying the included angle of the triangular serrations. It was observed that the maximum noise attenuation occurred at frequencies above 5 kHz, where the TE noise dominates over the Leading-Edge (LE) noise. For frequencies below 5 kHz, the LE noise sources dominate over the TE noise
A sponge-layer damping technique for aeroacoustic Time-Reversal
No full textAbstract not available.A. Mimani, Z. Prime, C.J. Doolan, P.R. Medwel
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