کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8062391 | 1520631 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Flow behavior behind a clockwise-and-counterclockwise rotational oscillating cylinder
ترجمه فارسی عنوان
رفتار جریان در پشت سیلندر نوسان چرخان به سمت عقب و عقب
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی دریا (اقیانوس)
چکیده انگلیسی
Flow characteristics downstream of a rotational oscillating cylinder at Reynolds number Reâ¯=â¯300 was investigated. The experiments were conducted using a model cylinder in a recirculating open water channel and the flow field was captured by using the Particle Image Velocimetry (PIV) technique. The model cylinder was set to undergo clockwise-and-counterclockwise rotation at selected angular amplitude (angular amplitude α varying from 0° to 360°) and at the lock-on frequency ratio Frâ¯=â¯1.0 (where Frâ¯=â¯fn/fv, the ratio of the forcing frequency fn to the natural vortex shedding frequency fv). The effects of rotational movement of the cylinder on the near wake downstream of the cylinder were interpreted in terms of the instantaneous vorticity patterns, as well as the time-averaged streamline topology, mean velocity distributions and Reynolds shear stress contours. Based on the observation of the flow patterns and vortex contours, it was deduced that the clockwise-and-counterclockwise rotation produced significant effect on the wake and modified the wake flow structures and vortex shedding patterns. The time-averaged streamline structures appeared to be non-symmetrical about the longitudinal axis of the flow.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 159, 1 July 2018, Pages 410-421
Journal: Ocean Engineering - Volume 159, 1 July 2018, Pages 410-421
نویسندگان
Yangyang Gao, Kang Yang, Xingyue Ren, Baofeng Zhang, Soon Keat Tan,