### Abstract

An initial-value problem is formulated for a threedimensional wave packet in a hypersonic boundary layer flow. The problem is solved using a Laplace transform with respect to time and Fourier transforms with respect to the streamwise and spanwise coordinates. The solution can be presented as a sum of modes consisting of continuous and discrete spectra of temporal stability theory. Two discrete modes, known as Mode S and Mode F, are of interest since they may be involved in a laminar-turbulent transition scenario. The continuous and discrete spectrum are analyzed numerically, and the following features are revealed: (1) the synchronism of Mode S with acoustic waves at low wave number is primarily twodimensional; (2) at high angles of dis turbance propagation, Mode F is no longer synchronized with entropy and vorticity waves; (3) at high angles of disturbance propagation, the synchronism between Mode S and Mode F no longer leads to a Mode S instability, and at even higher angles of disturbance propagation, Mode S and Mode F are not synchronized.

Original language | English |
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Title of host publication | 34th AIAA Fluid Dynamics Conference and Exhibit |

State | Published - 1 Dec 2004 |

Event | 34th AIAA Fluid Dynamics Conference and Exhibit 2004 - Portland, OR, United States Duration: 28 Jun 2004 → 1 Jul 2004 |

### Publication series

Name | 34th AIAA Fluid Dynamics Conference and Exhibit |
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### Other

Other | 34th AIAA Fluid Dynamics Conference and Exhibit 2004 |
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Country | United States |

City | Portland, OR |

Period | 28/06/04 → 1/07/04 |

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## Cite this

*34th AIAA Fluid Dynamics Conference and Exhibit*(34th AIAA Fluid Dynamics Conference and Exhibit).