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  • 1980-1984  (2)
  • 1970-1974
  • 1984  (2)
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  • 1980-1984  (2)
  • 1970-1974
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  • 1
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    Numerical simulation of the interaction of a vortex with stationary airfoil in transonic flow (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A perturbation form of an implicit conservative, noniterative numerical algorithm for the two-dimensional thin layer Navier-Stokes and Euler equations is used to compute the interaction flow-field of a vortex with stationary airfoil. A Lamb-like analytical vortex having a finite core is chosen to interact with a thick (NACA 0012) and a thin (NACA 64A006) airfoil independently in transonic flow. Two different configurations of vortex interaction are studied, viz., (1) when the vortex is fixed at one location in the flowfield, and (2) when the vortex is convecting past the airfoil at freestream velocity. Parallel computations of this interacting flowfield are also done using a version of the Transonic Small Disturbance Code (ATRAN2). A special treatment of the leading edge region for thin airfoils is included in this code. With this, the three methods gave qualitatively similar results for the weaker interactions considered in this study. However, the strongest interactions considered proved to be beyond the capabilities of the small disturbance code. The results also show a far greater influence of the vortex on the airfoil flowfield when the vortex is stationary than when it is convecting with the flow.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 84-0254
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Transonic interactions of unsteady vortical flows (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Unsteady interactions of strong concentrated vortices, distributed gusts, and sharp-edged gusts with stationary airfoils were analyzed in two-dimensional transonic flow. A simple and efficient method for introducing such vortical disturbances was implemented in numerical codes that range from inviscid transonic small disturbance to thin-layer Navier Stokes. The numerical results demonstrate the large distortions in the overall flow field and in the surface air loads that are produced by various vortical interactions. The results of the different codes are in excellent qualitative agreement, but, as might expected, the transonic small-disturbance calculations are deficient in the important region near the leading edge.
    Keywords: AERODYNAMICS
    Type: NASA-TM-86658 , REPT-85075 , NAS 1.15:86658 , USAAVSCOM-TM-84-A-10 , AD-A152417
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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