摘要: Specifically, progress to date has proceeded on three fronts, each of whichexpands existing DNS capabilities in the direction of 'configuration DNS' stated in general objective 1 above. Previous experimental and numerical work on ... 展开 Specifically, progress to date has proceeded on three fronts, each of whichexpands existing DNS capabilities in the direction of 'configuration DNS' stated in general objective 1 above. Previous experimental and numerical work on the elliptic-cone problem by others has shown that crossflow instabilities, rather than first or second mode instabilities, are likely to dominate the transition process when the eccentricity of the cross-sectional ellipse is moderate to large. Thus, the problem is particularly difficult for two reasons: (1) existing DNS capabilities must be expanded in terms of configuration (complex geometry), and (2) little or no experience exists in the simulation of crossflow instability for high-speed flows. Because of the difficulty of the problem, it was deemed best to proceed incrementally, from the current state of the art along three fronts: (1) simulation of transition on a flared, axisymmetric cone in hypersonic flow, (2) simulation of crossflow instability on a supersonic swept wing, and (3) simulation of a transitional hypersonic flow on a cone with an elliptical. 收起