کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053431 1457606 2018 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fluid-structure interaction of combined and independent configurations of two side-by-side square cylinders at low Reynolds number
ترجمه فارسی عنوان
اثر متقابل ساختار مایع تنظیمات ترکیبی و مستقل دو سیلندر مربعی کنار بطری در تعداد رینولدز کم
کلمات کلیدی
استوانه های مربعی کنار سمت، رژیم جریان شکاف، رژیم فرو ریختن همدردی، ارتعاش ناشی از باد گول زدن،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The objective of this paper is to investigate the vibrational characteristics and the coupled wake dynamics of two elastically mounted side-by-side square cylinders in a uniform flow stream. A series of fluid-structure interaction simulations is performed at low Reynolds number for two vibrating configurations, namely combined and independent. In the combined vibrating configuration, two square cylinders are tied together through a linkage as one single rigid body with a fixed relative position between them. The elastically mounted system is free to vibrate with the two-degrees-of-freedom (2-DOF) in the streamwise and transverse directions. For the independent vibrating condition, each cylinder is free to vibrate independently with 2-DOF motion in the streamwise and transverse directions which result into the coupled 4-DOF system interacting with the vortex wakes. The computational results of the independent vibrating condition are compared with the combined vibrating counterpart for identical fluid-structure parameters. Three representative gap ratios g*=1.2, 1.6 and 2 are selected for a detailed comparison, whereby the gap ratio g* is defined as the spacing between the inner cylinder surfaces to the diameter of the cylinder. Two-dimensional simulations are examined for a broad range of reduced velocity Ur ∈ [1, 40] at mass ratio m*=10. The effects of reduced velocity on the force responses, the vibration amplitudes, and the vorticity contours are analyzed systematically to understand the underlying vortex-induced vibration (VIV) and the wake physics of the side-by-side system. The effect of three-dimensional flow mechanics is further explored and the independent vibrating condition at the reduced velocity corresponding to the maximum synchronization is considered for two representative gap ratios g*=1.2 and 2. All the simulations are performed via a nonlinear partitioned iterative scheme for the coupled fluid-structure system based on the Navier-Stokes and the rigid-body equations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 72, August 2018, Pages 214-232
نویسندگان
, , , , , ,