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http://dx.doi.org/10.5139/JKSAS.2014.42.7.535

CFD Analysis of Aerodynamic Characteristics of a BWB UCAV configuration with Transition effect  

Jo, Young-Hee (Department of Aeronautical System Engineering, Hanseo University)
Chang, Kyoungsik (Department of Aeronautical & Mechanical Engineering, Hanseo University)
Sheen, Dong-Jin (Department of Aeronautical & Mechanical Engineering, Hanseo University)
Park, Soo Hyung (Aerospace Information Engineering, Konkuk University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.42, no.7, 2014 , pp. 535-543 More about this Journal
Abstract
A computational simulation for a nonslender BWB UCAV configuration with rounded leading edge and span of 1.0m was performed to analyze its aerodynamic characteristics. The freestream is 50m/s over -4 to 26 degree A.o.A.s. Reynolds number based on the mean chord length is $1.25{\times}10^6$. 3D multi block hexahedral grids are used which allow good grid quality and ease to capture boundary layer. ${\gamma}-Re_{\theta}$ model as well as $k-{\omega}$ SST model is employed to assess the effect of transition for flow behavior. Drag and lift of the UCAV were well predicted while $C_M$ is under predicted at high angle of attacks and influenced by the turbulence models strongly. After assessing pressure distribution, skin friction lines and velocity field around the UCAV configuration, it was found that transition effect should be considered to enhance the prediction of aerodynamic behavior by a vortical flowfield.
Keywords
UCAV; Leading Edge Vortex; Transition model; Nonsleder Delta Wing; Vortex Breakdown;
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