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  • 1
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    Automatic adaptive grid refinement for the Euler equations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A method of adaptive grid refinement for the solution of the steady Euler equations for transonic flow is presented. Algorithm automatically decides where the coarse grid accuracy is insufficient, and creates locally uniform refined grids in these regions. This typically occurs at the leading and trailing edges. The solution is then integrated to steady state using the same integrator (FL052) in the interior of each grid. The boundary conditions needed on the fine grids are examined and the importance of treating the fine/coarse grid interface conservatively is discussed. Numerical results are presented.
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 23; 561-568
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Experimental and theoretical investigation of a slotted noise shield model for wind tunnel walls (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Tests at Mach 6 and 8 have been conducted on a model of a wind tunnel sound radiation shield which consists of interchangeable circular and wedge-shaped longitudinal rods with gaps between the rods for boundary layer removal. In view of the large effective sweep angle of the circular rods with respect to the local flow, the boundary layer behavior was surprisingly well represented by swept cylinder theory. Laminar flow was maintained up to a maximum local unit Reynolds number of 8 million per foot which would presumably be independent of model length for a given rod diameter by analogy with results on swept cylinders. Reduction in wind-tunnel sound levels within the shielded region of the circular rod model were about 90% of the maximum possible reduction for an ideal shield.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 74-624 , Aerodynamic Testing Conference; Jul 08, 1974 - Jul 10, 1974; Bethesda, MD
    Format: text
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    NASA TECHNICAL REPORTS
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