A Theoretical and Experimental Study of the Interaction of a Streamwise Vortex with a Surface PDF Download
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Author: Gustavo Cesar Rachid Bodstein
Publisher:
ISBN:
Category : Acoustic streaming
Languages : en
Pages : 370
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Author: Gustavo Cesar Rachid Bodstein
Publisher:
ISBN:
Category : Acoustic streaming
Languages : en
Pages : 370
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Author: Alfredo Gabrie
Publisher:
ISBN:
Category : Surfaces, Models of
Languages : en
Pages : 192
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Author: A. W. Cerra
Publisher:
ISBN:
Category : Flow visualization
Languages : en
Pages : 356
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Book Description
Experimental studies examined the breakdown of initially laminar vortex rings during impact with both solid and free surfaces in a quiescent environment, and with a solid surface beneath a developing laminar boundary layer. Flow interactions were visualized in water using dye and hydrogen-bubble techniques and recorded with a high-speed video system. When a vortex ring approaches a surface the resulting flow interaction appears to be chaotic and turbulent, but is actually a very organized viscid-inviscid process which rapidly disperses the vorticity of the vortex ring throughout the surrounding fluid. Described is the flow interaction which integrates the following phenomena: (1) generation of secondary vorticity of opposite sense to that of the vortex ring; (2) deviations in the trajectory of the vortex ring from that predicted by classical theory; and (3) the processes of organized dispersal of vorticity. The process by which vorticity dispersal occurs is dependent upon the initial Reynolds number (Re sub 0) of the vortex ring. For very weak rings, i.e. Re sub o less than 350, vorticity is dispersed by laminar diffusion. For stronger rings, vorticity dispersal occurs discretely through formation of secondary and tertiary vortex rings (SVR and TVR) via a viscous boundary layer process. Vorticity dispersal continues as a result of Biot-Savart-type interactions of the SVR and TVR with the original or primary vortex ring. During this interaction the diameter of the SVR is compressed, causing an instability in the SVR which is characterized by an azimuthal waviness.
Author: William W. Humphreys
Publisher:
ISBN:
Category :
Languages : en
Pages : 502
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 784
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Author: Rolf Radespiel
Publisher: Springer
ISBN: 3319211277
Category : Technology & Engineering
Languages : en
Pages : 404
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Book Description
The book reports on advanced solutions to the problem of simulating wing and nacelle stall, as presented and discussed by internationally recognized researchers at the Closing Symposium of the DFG Research Unit FOR 1066. Reliable simulations of flow separation on airfoils, wings and powered engine nacelles at high Reynolds numbers represent great challenges in defining suitable mathematical models, computing numerically accurate solutions and providing comprehensive experimental data for the validation of numerical simulations. Additional problems arise from the need to consider airframe-engine interactions and inhomogeneous onset flow conditions, as real aircraft operate in atmospheric environments with often-large distortions. The findings of fundamental and applied research into these and other related issues are reported in detail in this book, which targets all readers, academics and professionals alike, interested in the development of advanced computational fluid dynamics modeling for the simulation of complex aircraft flows with flow separation.
Author: T. Sarpkaya
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 670
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