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• W2603001640 abstract "There have been a considerable number of theoretical, experimental and computationalstudies on vortex shedding. Experimental investigations of unsteady flow behind a startingcircular cylinder date back to the Prandtl era [1]. The most extensive experiments to datefor an impulsively started cylinder are those presented by Bouard and Coutanceau [2]. Atthe same time, considerable effort has been directed toward finding both analytical and accuratefinite-difference solutions. This previous work provided extensive information aboutthe main flow characteristics but was limited in several respects: all the known analyticalsolutions are only valid for short times; finite-difference methods often suffer from numericalstability and dissipation problems; and experimental data is limited in both spatial and temporalresolution. The recent development of techniques for measuring instantaneous fields ofvectors with high spatial and temporal resolution, such as PIV [3] and its digital counterpartDPIV [4], was an important achievement for modern experimental fluid mechanics. Furthermore,spectral domain decomposition methods have been developed that provide betteraccuracy and take full advantage of parallel supercomputers for high-resolution calculations.In this paper, complementary advanced experimental and numerical techniques are used toobtain information on secondary flow quantities such as the vorticity, quantities that arecrucial in understanding the dynamics of coherent structures.The present study deals with the determination of the plane viscous flow around a circularcylinder that accelerates linearly from rest to a constant speed U_0 in a quiescent fluid. Wedefine the Reynolds number as Re ≡ U_0d/ν, where d is the cylinder diameter and ν is thekinematic viscosity of the fluid. In the results presented here, Re ≈ 1000 and the accelerationtime is t* ≡ tU_0/d = 1.575. The objective of this coordinated experimental-computationalstudy is to compare experimental techniques (DPIV) and numerical simulations (DNS) forthe start-up flow past a circular cylinder. We chose this problem because its initial featuresare two-dimensional and it exhibits behavior characteristic of bluff body wake dynamics. Thepurpose of this ongoing research is to try to shed some light on the fundamental mechanismsgoverning the vortex formation process by monitoring the evolution of the flow field." @default.
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• W2603001640 date "1995-01-01" @default.
• W2603001640 modified "2023-09-27" @default.
• W2603001640 title "Start-up flow past a circular cylinder: A comparison between DPIV and DNS" @default.
• W2603001640 hasPublicationYear "1995" @default.
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