Accession Number : ADA266139


Title :   Turbulence Modeling for Thrust Reverser Flow Field Prediction Methods


Descriptive Note : Final rept. 30 Apr 1990-31 Dec 1992


Corporate Author : NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CA


Personal Author(s) : Childs, Robert E ; Rodman, Laura C ; Bradshaw, Peter


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266139.pdf


Report Date : Dec 1992


Pagination or Media Count : 70


Abstract : The use of thrust reversing on aircraft operating in ground effect produces complex flow fields, for which conventional turbulence models are inadequate. The main objective of the work was to produce an improved turbulence model. The work included experimental measurements of an impinging jet inclined 45 degrees into the crossflow. Large eddy simulation (LES) was used to identify the dominant turbulent physics in these flows and to guide the development of an improved k-E model for Reynolds-averaged calculations. Modifications to the k-E model for the effects of streamline curvature and vortex stretching (lateral divergence) were used. Compared to the original k-E model, the modified model reduced by as much as 70 percent the errors in predicting the ground vortex location. Impinging jets, Turbulence modeling, Computational fluid, Dynamics.


Descriptors :   *TURBULENCE , *COMPUTATIONAL FLUID DYNAMICS , *THRUST , *FLOW FIELDS , SIMULATION , MEASUREMENT , PHYSICS , WORK , GROUND EFFECT , FLUID DYNAMICS , ERRORS , CURVATURE , AIRCRAFT , MODELS , MODIFICATION


Subject Categories : Aerodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE