کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4451747 1620658 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigation of flow characteristics around four square-cylinder arrays at subcritical Reynolds numbers
ترجمه فارسی عنوان
بررسی تجربی ویژگی های جریان در اطراف آرایه های چهار سیلندر در اعداد رینولدز زیر کریستال
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی

ABSTRACTThe Deep Draft Semi-Submersible (DDS) concepts are known for their favourable vertical motion performance. However, the DDS may experience critical Vortex-Induced Motion (VIM) stemming from the fluctuating forces on the columns. In order to investigate the current-induced excitation forces of VIM, an experimental study of flow characteristics around four square-section cylinders in a square configuration is presented. A number of column spacing ratios and array attack angles were considered to investigate the parametric influences. The results comprise flow patterns, drag and lift forces, as well as Strouhal numbers. It is shown that both the drag and lift forces acting on the cylinders are slightly different between the various L/D values, and the fluctuating forces peak at L/D = 4.14. The lift force of downstream cylinders reaches its maximum at around α = 15°. Furthermore, the flow around circular- section-cylinder arrays is also discussed in comparison with that of square cylinders.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Naval Architecture and Ocean Engineering - Volume 7, Issue 5, September 2015, Pages 906–919
نویسندگان
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