کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8062313 | 1520631 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A linearization coefficient for Morison force considering the intermittent effect due to free surface fluctuation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی دریا (اقیانوس)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
For members located near the free surface, an intermittent effect caused by the free surface fluctuation makes statistical properties of fluid particle kinematics different. Therefore, a linearization coefficient of the drag force derived under the assumption that the particle velocity and acceleration follow the Gaussian process are not valid above the still water level. The present paper derives the linearization coefficient for the drag force considering the intermittent effect. Force spectra and mean values of force maxima at each location are compared between nonlinear and linearized drag force to verify the validity of the proposed coefficient. The linearization coefficients derived from fully submerged section are constant irrespective of the observation position, and it tends to underestimate both the mean values of peak forces and force spectra as the observation height increases near the free surface. The proposed linearization coefficient reflects the effect of the free surface fluctuation and improves the error between the nonlinear and linear drag with increasing observation position.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 159, 1 July 2018, Pages 139-149
Journal: Ocean Engineering - Volume 159, 1 July 2018, Pages 139-149
نویسندگان
Hyeon-Jin Kim, Kangsu Lee, Beom-Seon Jang,