کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8063486 1520642 2018 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical investigation of the effect of plane boundary on two-degree-of-freedom of vortex-induced vibration of a circular cylinder in oscillatory flow
ترجمه فارسی عنوان
بررسی عددی اثر مرز هواپیما بر دو درجه ارتعاش ناشی از گرداب یک سیلندر دایره ای در جریان نوسان
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی
The laying of subsea pipelines often produces situations where the pipeline is suspended above the seabed due to local erosion of sediment. In this paper, flow induced vibration of a circular cylinder close to a plane boundary in an oscillatory flow is studied through two-dimensional numerical simulations. The circular cylinder and the plane boundary represents a pipeline and the seabed, respectively. It is found that the plane boundary affects the vibration amplitude in the cross-flow direction significantly. The vibration in the vertical direction ceases if reduced velocity exceeds 6 for KC = 5 and 12 for KC = 10, respectively. The vibration in the cross-flow direction stops when the reduced velocity exceeds a critical value because the effective KC number and the effective reduced velocity, which are both based on the relative velocity of the cylinder to the fluid motion, are extremely small. For KC = 10, the vortex shedding is found to be in one pair regime for most of the reduced velocities and non-vortex shedding regime exists at large reduced velocities. Because the shear layers generated from the plane boundary attract the vortices generated from the cylinder, vortex shedding occurs only at the bottom side of the cylinder.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 148, 15 January 2018, Pages 17-32
نویسندگان
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