The analysis of transition in fully three-dimensional boundary layers on high-speed aircraft is hampered by the lack of a rigorous theory of instability in these flows and the lack of accurate data to evaluate approximations. To provide such data, we have in this first phase of a longer- term effort designed a computational framework for this task. This framework allows interactive computations and data analysis in connected blocks of the ...
The cross flow-initiated transition process over the surface of a supersonic 4:1 elliptic cone with 17.5 degree half-angle has been investigated using state-of-the-art local and PSE stability analyses. The basic flow was computed using the AFWAL PNS code. The local stability analysis was performed in order to find the regions and parameter ranges in which the cross flow vortex is unstable. The PSE analyses were then carried out in order ...
The parabolized stability equations (PSE) are a new and more reliable approach to analyzing the stability of streamwise varying flows such as boundary layers. This approach has been previously validated for idealized incompressible flows. Here, the PSE are formulated for highly compressible flows in general curvilinear coordinates to permit the analysis of high-speed boundary-layer flows over fairly general bodies. Vigorous numerical studies are carried out to study convergence and accuracy ...
This manual describes how to use the local linear stability code LSH and the nonlinear Parabolized Stability Equations (PSE) solver PSH for compressible flows. Both codes are adaptable to analysis of different flows over fairly general shapes of bodies. For analysis of a new problem, the user may specify the basic state, the coordinate system, dependent disturbance variables and their boundary conditions to be used for the stability analysis through ...
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