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Scattering of Tollmien-Schlichting waves by localized roughness in transonic boundary layers.
- Source :
-
Applied Mathematics & Mechanics . Jul2020, Vol. 41 Issue 7, p1105-1124. 20p. - Publication Year :
- 2020
-
Abstract
- The laminar-turbulent transition in boundary-layer flows is often affected by wall imperfections, because the latter may interact with either the freestream perturbations or the oncoming boundary-layer instability modes, leading to a modification of the accumulation of the normal modes. The present paper particularly focuses on the latter mechanism in a transonic boundary layer, namely, the effect of a two-dimensional (2D) roughness element on the oncoming Tollmien-Schlichting (T-S) modes when they propagate through the region of the rapid mean-flow distortion induced by the roughness. The wave scattering is analyzed by adapting the local scattering theory developed for subsonic boundary layers (WU, X. S. and DONG, M. A local scattering theory for the effects of isolated roughness on boundary-layer instability and transition: transmission coefficient as an eigenvalue. Journal of Fluid Mechanics, 794, 68–108 (2006)) to the transonic regime, and a transmission coefficient is introduced to characterize the effect of the roughness. In the sub-transonic regime, in which the Mach number is close to, but less than, 1, the scattering system reduces to an eigenvalue problem with the transmission coefficient being the eigenvalue; while in the super-transonic regime, in which the Mach number is slightly greater than 1, the scattering system becomes a high-dimensional group of linear equations with the transmission coefficient being solved afterward. In the large-Reynolds-number asymptotic theory, the Kármán-Guderley parameter is introduced to quantify the effect of the Mach number. A systematical parametric study is carried out, and the dependence of the transmission coefficient on the roughness shape, the frequency of the oncoming mode, and the Kármán-Guderley parameter is provided. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02534827
- Volume :
- 41
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Applied Mathematics & Mechanics
- Publication Type :
- Academic Journal
- Accession number :
- 144371546
- Full Text :
- https://doi.org/10.1007/s10483-020-2622-6