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  • METEOROLOGY AND CLIMATOLOGY  (5)
  • 1975-1979  (5)
  • 1955-1959
  • 1
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    Unknown
    Model predictions of wind and turbulence profiles associated with an ensemble of aircraft accidents (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of predicting conditions under which wind/turbulence environments hazardous to aviation operations exist is studied by examining a number of different accidents in detail. A model of turbulent flow in the atmospheric boundary layer is used to reconstruct wind and turbulence profiles which may have existed at low altitudes at the time of the accidents. The predictions are consistent with available flight recorder data, but neither the input boundary conditions nor the flight recorder observations are sufficiently precise for these studies to be interpreted as verification tests of the model predictions.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-2884 , M-225
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Turbulent transport model of wind shear in thunderstorm gust fronts and warm fronts (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A model of turbulent flow in the atmospheric boundary layer was used to simulate the low-level wind and turbulence profiles associated with both local thunderstorm gust fronts and synoptic-scale warm fronts. Dimensional analyses of both type fronts provided the physical scaling necessary to permit normalized simulations to represent fronts for any temperature jump. The sensitivity of the thunderstorm gust front to five different dimensionless parameters as well as a change from axisymmetric to planar geometry was examined. The sensitivity of the warm front to variations in the Rossby number was examined. Results of the simulations are discussed in terms of the conditions which lead to wind shears which are likely to be most hazardous for aircraft operations.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-3002 , ARAP-327
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Turbulent transport model of a thunderstorm gust front (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A second-order closure turbulent model is adopted to predict complex fluid flows; few a priori assumptions about the internal turbulent and mean flow structures are required. The flow simulations are applied to the analysis of local gust fronts generated by rain-cooled outflows from severe thunderstorms. Results of the simulations provide a means for discussing the behavior of an aircraft passing through a thunderstorm-related downdraft.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Severe Local Storms; Oct 18, 1977 - Oct 21, 1977; Omaha, NE
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Micrometeorological applications of a second-order closure model of turbulent transport (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Recent applications of the turbulent transport model originally developed by Donaldson to some problems of practical importance in micrometeorology are discussed. Four particular examples considered are the local boundary layer gust front emanating from a thunderstorm; the low-level wind and turbulent distributions of a tornado; the transport of momentum, heat and species within a surface layer canopy, and longitudinal roll vortices in the unstable planetary boundary layer. Results for the last example are discussed in some detail. Comparisons are made between a one-dimensional and a two-dimensional computation of this phenomenon.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Symposium on Turbulent Shear Flows; Jul 02, 1979 - Jul 04, 1979; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The prediction of turbulence and wind shear associated with thunderstorm gust fronts (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The parametric dependence of storm simulation is explored on the basis of the previously reported (1977) second-order closure model of turbulence designed to simulate a thunderstorm gust front. The model simulation results are intended for extrapolation to the conditions considered most hazardous to aircraft operation. It is shown that the presistence and strength of the gust front are enhanced significantly by increasing the spread of the downdraft shaft and the velocity at the top of the domain. Turbulence develops in the regions of high shear and is most intense near the corner and within the gust front itself. While the center shaft is certainly an area to be avoided, the gust front region is probably more critical because it may extend over a large region far from the center of the downdraft, in a highly transient state.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Atmospheric Environment of Aerospace Systems and Applied Meteorology; Nov 14, 1978 - Nov 16, 1978; New York, NY
    Format: text
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    NASA TECHNICAL REPORTS
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