Engineering topics
Publications and source records attributed to Woan, Chung-Jin.
This paper presents some recently added capabilities to RAGGS, Rockwell Automated Grid Generation System. Included are the trimmed surface handling and display capability and structures and unstructured grid generation on trimmed Bezier and NURBS (non-uniform rational B-spline surfaces) quilted surfaces. Samples are given to demonstrate the new capabilities.
The application of CFD methods to high-angle-of-attack flight regimes is studied. The X-31 configuration was chosen as the model due to its inherent designed high-angle-of-attack characteristics and capabilities, the existence of a wind tunnel database, and the ongoing flight test program. The flow characteristics of the X-31 at high angle-of-attack are presented and the CFD capability for studying the effects of canard deflection on aerodynamic control during poststall is revealed.
A three-dimensional Navier-Stokes code is used in conjunction with a linear compressible stability analysis code to develop a numerical procedure for prediction of laminar flow transition. The procedure is applied to a modified F-16XL fighter with a laminar flow control glove at supersonic speed. Details of boundary layer stability analysis indicate that, computationally, laminar flow could be realized on the highly swept wing in the absence of the leading edge attachment-line contamination. Effects of the three-dimensionality of the flow were shown to be important in the boundary layer stability analysis. The numerically predicted surface pressures compare favorably with the flight test data.