کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
761545 1462691 2015 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Extreme wave elevations beneath offshore platforms, second order trapping, and the near flat form of the quadratic transfer functions
ترجمه فارسی عنوان
بلند شدن موجهای شدید زیر سیستمهای دریایی، تله دوم مرتبه و شکل نزدیکترین تخت توابع انتقال درجه دوم
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
چکیده انگلیسی


• Extreme wave-structure interactions are investigated to second-order.
• Excitation of near-trapped modes by 1st and 2nd-order interactions is compared.
• Flat QTF matrix approximation used to minimise QTF calculations.
• Accuracy of flat QTF approximation in surface elevation calculations is assessed.

Extreme free surface elevations due to wave-structure interactions are investigated to second order using Quadratic Transfer Functions (QTFs). The near-trapping phenomenon for small arrays of closely spaced columns is studied for offshore applications, and the excitation of modes by linear and second order interactions is compared. A simple method for approximating near-trapped mode shapes is shown to give good results for both linear and second order excitation. Low frequency near-trapped mode shapes are shown to be very similar whether excited linearly or to second order. Approximating surface elevation sum QTF matrices as being flat perpendicular to the leading diagonal is investigated as a method for greatly reducing lengthy QTF calculations. The effect of this approximation on second order surface elevation calculations is assessed and shown to be reasonably small with realistic geometries for semi-submersible and tension-leg platforms.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers & Fluids - Volume 119, 22 September 2015, Pages 13–25
نویسندگان
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