A high-order shock-fitting finite difference scheme is studied and used to do direc-tion numerical simulation (DNS) of hypersonic unsteady flow over a blunt cone with fast acoustic waves in the free stream, and the re...A high-order shock-fitting finite difference scheme is studied and used to do direc-tion numerical simulation (DNS) of hypersonic unsteady flow over a blunt cone with fast acoustic waves in the free stream, and the receptivity problem in the blunt cone hypersonic boundary layers is studied. The results show that the acoustic waves are the strongest disturbance in the blunt cone hypersonic boundary layers. The wave modes of disturbance in the blunt cone boundary layers are first, second, and third modes which are generated and propagated downstream along the wall. The results also show that as the frequency decreases, the amplitudes of wave modes of disturbance increase, but there is a critical value. When frequency is over the critial value, the amplitudes decrease. Because of the discontinuity of curvature along the blunt cone body, the maximum amplitudes as a function of frequencies are not monotone.展开更多
Focuses on a study wherein a type of shock fitting method has been used to solve dimensional flow problems with interactions of various discontinuities. Discretization of the transformed equations; Numerical results; ...Focuses on a study wherein a type of shock fitting method has been used to solve dimensional flow problems with interactions of various discontinuities. Discretization of the transformed equations; Numerical results; Interactions of discontinuities.展开更多
基金the National Natural Science Foundation of China (Grant Nos. 10632050 and 10502052)
文摘A high-order shock-fitting finite difference scheme is studied and used to do direc-tion numerical simulation (DNS) of hypersonic unsteady flow over a blunt cone with fast acoustic waves in the free stream, and the receptivity problem in the blunt cone hypersonic boundary layers is studied. The results show that the acoustic waves are the strongest disturbance in the blunt cone hypersonic boundary layers. The wave modes of disturbance in the blunt cone boundary layers are first, second, and third modes which are generated and propagated downstream along the wall. The results also show that as the frequency decreases, the amplitudes of wave modes of disturbance increase, but there is a critical value. When frequency is over the critial value, the amplitudes decrease. Because of the discontinuity of curvature along the blunt cone body, the maximum amplitudes as a function of frequencies are not monotone.
基金the North Carolina Supercomputing Center, the RGC of Hong Kong,and the FRG of Hong Kong Baptist University.
文摘Focuses on a study wherein a type of shock fitting method has been used to solve dimensional flow problems with interactions of various discontinuities. Discretization of the transformed equations; Numerical results; Interactions of discontinuities.
