کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
650765 | 1457314 | 2008 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stability of the laminar boundary layer flow encountering a row of roughness elements: Biglobal stability approach and DNS
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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![عکس صفحه اول مقاله: Stability of the laminar boundary layer flow encountering a row of roughness elements: Biglobal stability approach and DNS Stability of the laminar boundary layer flow encountering a row of roughness elements: Biglobal stability approach and DNS](/preview/png/650765.png)
چکیده انگلیسی
The stability of the laminar boundary layer developing on a flat plate in the presence of a periodic row of roughness elements is investigated. A Direct Numerical Simulation is performed to compute the steady flow downstream of the roughness elements, which contains a pair of two counter-rotating streamwise vortices per element, which can be considered as a “pre-streaky” structure. The linear stability of this base flow is analyzed by means of the so-called “biglobal” stability approach. Three-dimensional eigenmodes are found, which are shown to be the continuation of the Tollmien-Schlichting waves present in the case of an unperturbed boundary layer. Moreover, a stabilizing effect due to the roughness-induced vortices is found. A Direct Numerical Simulation of the interaction between a two-dimensional Tollmien-Schlichting wave and the roughness array is also performed. The computed perturbation traveling downstream of the roughness elements is shown to be a linear combination of the biglobal eigenmodes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 27, Issue 6, NovemberâDecember 2008, Pages 684-706
Journal: European Journal of Mechanics - B/Fluids - Volume 27, Issue 6, NovemberâDecember 2008, Pages 684-706
نویسندگان
E. Piot, G. Casalis, U. Rist,