Author: R. Sondergaard
Publisher:
ISBN:
Category :
Languages : en
Pages : 328

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Author: Rolf Sondergaard
Publisher:
ISBN:
Category :
Languages : en
Pages : 332

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 692

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Author: Ames Research Center
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 200

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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723560347
Category :
Languages : en
Pages : 324

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Direct numerical simulations have been used to examine the effect of the initial disturbance field on the development of three-dimensionality and the transition to turbulence in the incompressible plane wake. The simulations were performed using a new numerical method for solving the time-dependent, three-dimensional, incompressible Navier-Stokes equations in flows with one infinite and two periodic directions. The method uses standard Fast Fourier Transforms and is applicable to cases where the vorticity field is compact in the infinite direction. Initial disturbances fields examined were combinations of two-dimensional waves and symmetric pairs of 60 deg oblique waves at the fundamental, subharmonic, and sub-subharmonic wavelengths. The results of these simulations indicate that the presence of 60 deg disturbances at the subharmonic streamwise wavelength results in the development of strong coherent three-dimensional structures. The resulting strong three-dimensional rate-of-strain triggers the growth of intense fine scale motions. Wakes initiated with 60 deg disturbances at the fundamental streamwise wavelength develop weak coherent streamwise structures, and do not develop significant fine scale motions, even at high Reynolds numbers. The wakes which develop strong three-dimensional structures exhibit growth rates on par with experimentally observed turbulent plane wakes. Wakes which develop only weak three-dimensional structures exhibit significantly lower late time growth rates. Preliminary studies of wakes initiated with an oblique fundamental and a two-dimensional subharmonic, which develop asymmetric coherent oblique structures at the subharmonic wavelength, indicate that significant fine scale motions only develop if the resulting oblique structures are above an angle of approximately 45 deg. Sondergaard, R. and Cantwell, B. and Mansour, N. Ames Research Center NASA-CR-203613, NAS 1.26:203613, JIAA-TR-118 NCC2-55; N00014-90-J-1976...

Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 236

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Author: Arne V. Johansson
Publisher: Springer Science & Business Media
ISBN: 3642843999
Category : Science
Languages : en
Pages : 541

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The book covers the following main topics: turbulence structure, transition, dynamical systems in relation to transition, turbulent combustion and mixing, turbulence affected by body forces, turbulence modeling, drag reduction, and novel experimental techniques.

Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 422

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Author: Organisation du traité de l'Atlantique Nord. Groupe consultatif pour la recherche et le développement aérospatial. Technical Information Panel
Publisher:
ISBN: 9789283610199
Category : Aeronautics
Languages : en
Pages : 508

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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 708

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