국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Navier-Stokes Simulation and Linear Stability Analysis for a Boundary Layer on the Swept Cylinder
저자	Toshiyuki Nomura
Keyword	Laminar-Turbulent Transition; Linear Stability Analysis; Navier-Stokes Code; Attachment-Line Boundary Layer
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001321.pdf?id=NALTR0001321
보고서번호	NAL TR-1321
발행년도	1997.2
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	Techniques to delay laminar-turbulent transition on the wing, calld laminar-flow control, are important for drag reduction of high-speed civil transports cruising at supersonic speeds. The onset of transition is numerically predicted by computation of a boundary-layer flow, linear stability analysis for the flow and integration of the spatial growth rates obtained by the analysis. Boundary-layer flows used to predict the transition have been generally computed with boundary-layer codes. In this paper, a Navier-Stokes code is constructed for the computation. The supersonic flow around an infinite swept cylinder is computed with three types of grids which have different resolutions. The accuracy of the Navier-Stokes code is tested by comparing velocity and temperature profiles in the boundary layer obtained with these three grids. Furthermore, linear stability analysis for the attachment-line boundary layer is performed. The unstable ranges obtained by the analysis agree well the results of Malik (1998), which confirms the accuracy of the present Navier-Stokes code.