کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5474645 1520660 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Wave diffraction from a truncated cylinder with an upper porous sidewall and an inner column
ترجمه فارسی عنوان
پراش موج از یک سیلندر کوتاه با یک سقف فوقانی متخلخل و یک ستون داخلی
کلمات کلیدی
نظریه بالقوه، پراش موج، مشتق تحلیلی، ساختار متخلخل سیلندر خرد شده
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی


- An analytical model for wave diffraction from a truncated cylinder with surface-piercing porous part was developed.
- The notable influence of the presence of upper porous sidewall was revealed and the effect of the imaginary part of the porosity was considered.
- The effects of the draft ratio, the ratio of the inner and outer radii and the water depth were investigated.

An analytical model based on linear potential theory is proposed to predict the three-dimensional wave diffraction from a truncated cylinder with an upper porous sidewall and an inner column in the finite water depth. The velocity potential is analytically derived in the whole fluid domain based on the method of variable separation and eigen-function expansion technique. The continuous conditions of pressure and velocity potential are satisfied on the interface between the adjacent sub-domains. Wave forces are calculated directly from the incident and diffracted potentials. The model is validated in comparison with other published results of wave diffraction from a porous bottom-mounted cylinder and impermeable truncated cylinder, respectively. Then the numerical tests are performed to investigate the effects of the porous coefficient G, the draft ratio h/h1 (h and h1 mean the drafts of the porous part and whole cylinder, respectively), the ratio of the inner and outer radii b/a and the water depth d/h1 (d means the water depth) on the wave forces acting on the structure. It is found that, by introducing an upper porous sidewall, the hydrodynamic loads are improved in comparison with the fully impermeable structure, which may be benefit to enhance the survivability of the relating marine structure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 130, 15 January 2017, Pages 471-481
نویسندگان
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