TY - JOUR
ID - 71283
TI - Estimation of Hydrodynamic Force on Rough Circular Cylinders in Random Waves and Currents (RESEARCH NOTE)
JO - International Journal of Engineering
JA - IJE
LA - en
SN - 1025-2495
AU - Naghipour, M.
AD - , University of Mazandaran
Y1 - 2001
PY - 2001
VL - 14
IS - 1
SP - 25
EP - 34
KW - Hydrodynamic coefficients
KW - KC’s Number
KW - Random Waves
KW - Stokes Theory
DO -
N2 - Most of the Codes of Practice (API, BSI, DnV, NPD) uses Morison's equation to estimate hydrodynamic loads on fixed and moving offshore structures. The significant difference in the prediction of the loads mainly arises from the assumption of the values of hydrodynamic coefficients. In this paper by analysing a full scale set of data in large KC's numbers collected from Delta Wave Flume in the Netherlands the effects of random waves (JONSWAP spectrum) and uniform current over the artificially rough cylinder have been investigated. The prediction of water particle kinematics has been made from the surface elevation measurements using Stokes fifth order wave theory. By using the Weighted Least Squares technique the hydrodynamic coefficients have been estimated. A comparison between measured force and predicted force shows that although the accuracy of prediction over the whole data is about 90%, the errors on the local peaks are significant (24%) the case which is of interest in the ultimate limit state involving a single extreme wave.
UR - https://www.ije.ir/article_71283.html
L1 - https://www.ije.ir/article_71283_6a4ca41dbd63d1203e64a93c08664dd5.pdf
ER -