A theory is presented for the three-dimensional stability of boundary layers. Equations are derived for the evolution of a disturbance having a given frequency and originating at a given curve. These equations are used to determine the rays along…
Aeronautics
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Computational approaches are being developed to study a range of problems in aeroacoustics. These aeroacoustic problems may be classifiedbasedon the physical processes responsible for the soundradiation, andrange from linear problems of radiation,…
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The goal of this paper is to provide a perspective on the current status and future directions for active flow-control technology with particular emphasis on oscillatory control. This is not a comprehensive review of the literature; rather, certain…
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Asimple extension of the classic G (Received 1February 2002 and in revised form 16 December 2002) ortlerH forthree-dimensional linear instability analysis, is presented. The extended G H ammerlin (1955) (GH) model, essential ortler ammerlin model…
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Direct numerical simulations are performed to investigate the three-dimensional stability of compressible flow over open cavities.Alinear stability analysis is conducted to search for three-dimensional global instabilities of the two-dimensional…
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Methods are described for transient growth analysis of flows with arbitrary geometric complexity, where in particular the flow is not required to vary slowly in the streamwise direction. Emphasis is on capturing the global effects arising from…
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We are developing a dual panel breast-dedicated PET system using LSO scintillators coupled to position sensitive avalanche photodiodes (PSAPD). The charge output is amplified and read using NOVA RENA-3 ASICs. This paper shows that the coincidence…
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Biglobal linear stability analysis for the flow in eccentric annular channels and a related geometryRecently, it has been observed that simple geometry characterized by a low level of symmetry present interesting peculiarities in the process of transition from laminar Poiseuille flow to turbulent flow. Examples of this type of geometry are…
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A linear stability analysis shows that the jet in crossflow is characterized by self-sustained global oscillations for a jet-to-crossflow velocity ratio of 3. A fully three-dimensional unstable steady-state solution and its associated global…
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Of small disturbances results in the of corner 3. flows in a Attention now to the problem of corner in a
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Viscous linear 3-D BiGlobal instability analyses of incompressible flows have been performed using finite element numerical methods, with a view to extend the scope of application of this analysis methodology to flows over complex geometries. The…
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Results are reported from a highly accurate, global numerical stability analysis of the periodic wake of a circular cylinder for Reynolds numbers between 140 and 300. The analysis shows that the two-dimensional wake becomes (absolutely) linearly…
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We present a suite of algorithms designed to obtain accurate numerical solutions of the generalised eigenvalue problem governing inviscid linear instability of boundary-layer type of flow in both the incompressible and compressible regimes on planar…
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Transient energy growths of two- and three-dimensional optimal linear perturbations to two-dimensional flow in a rectangular backward-facing-step geometry with expansion ratio two are presented. Reynolds numbers based on the step height and peak…
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The sound generated by a circular cylinder in a flow at low Mach numbers is investigated by direct solution of the two-dimensional unsteady compressible Navier Stokes equations. Results show that sound pressure waves are generated primarily by…
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The need for better understanding of the low-frequency unsteadiness observed in shock wave/turbulent boundary layer interactions has been driving research in this area for several decades. We present here a large-eddy simulation investigation of the…
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This paper presents a review of theoretical and experimental results on stability and other unsteady properties of aircraft wakes. The basic mechanisms responsible for the propagation and the amplification of perturbation along vortices, namely the…
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