کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5012062 | 1462671 | 2016 | 43 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Inspecting sound sources in an orifice-jet flow using Lagrangian coherent structures
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A novel method is proposed to identify flow structures responsible for sound generation in confined flow past an inhibitor. Velocity fields obtained using Large Eddy Simulations (LES) are post-processed to compute the Finite Time Lyapunov Exponent (FTLE) field, the ridges of which in backward time represent an approximation to Lagrangian Coherent Structures (LCS), the structures that organize transport in the flow field. The flow-field is first decomposed using dynamic mode decomposition (DMD), and the organizing centers or vortices at the significant DMD frequencies are extracted. The results are then compared with the λ2 criterion. Features such as shear layer roll-up and development of secondary instabilities are more clearly visible in the FTLE field than with the λ2 criterion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers & Fluids - Volume 140, 25 November 2016, Pages 397-405
Journal: Computers & Fluids - Volume 140, 25 November 2016, Pages 397-405
نویسندگان
Vineeth Nair, Emma Alenius, Susann Boij, Gunilla Efraimsson,