... Abstract The paper identifies the wave drift forces and low frequency damping induced by a wide range of extreme sea conditions on two floating units based on model test data, assesses the limitations of today's numerical procedures and proposes solutions to overcome the limitations. Since wave...

... Abstract A new method for identification of wave drift coefficients and low-frequency damping from model tests is presented. The method is motivated by the lack of robust numerical methods for the calculation of the viscous contribution to the mean and slowly varying wave drift forces – often...

... by state-of-the-art hydrodynamic tools and procedures, and thereby higher mooring line loads, in high and steep waves. In particular, a need to re-explore wave-group induced slowly varying, low-frequency (LF) drift forces has been identified. Both mobile offshore units (MODU's) and permanently moored...

...; and a steady component of the second-order forces. The steady component of the wave force is called the "mean drift force". Computational procedures for the mean drift and first-order wave forces are well established (Reference 9). For second- order wave forces, a great deal of research has been conducted...

... Abstract In this paper the influence of the bow shape of FPSOS on drift forces and green water loading is studied. Use is made of the results of model tests and diffraction calculations for three different bow shapes: a traditional tanker bow, a sharp alternative bow without flare and the same...

.... As the low frequency response is a resonant phenomenon, it may only be predicted if adequate knowledge is available concerning low frequency damping. During low frequency excitation, wave drift forces are varying with the change of speed of the floating body, and this variation of the mean drift force can...

... nonlinear different value peak distribution fp structure subsea system drift force amplitude peak period normalized surge amplitude spectral shape upstream oil & gas basic sea state OTC 7198 @ @slot@ .. * % Extreme Surge and Mooring Load of FPS Structures M. Dogliani and A. Pittaluga...

... ABSTRACT The mean and low-frequency horizontal wave drift forces on 2 types of semi-submersible structures in regular and in irregular waves are determined from model tests and calculations. For the measurement of the low-frequency drift forces in irregular waves use is made of a special...

... tanker computation foil thrust horizontal motion amplitude fpso model test thrust upstream oil & gas head sea bow foil reduction offshore technology conference foil irregular wave mean thrust low-frequency motion drift force subsea system floating production system...

... displacement tension leg platform spectral density function subsea system peak frequency vector wave surface elevation frequency viscous drift force drift force transfer function wave peak frequency platform wave load potential drift force summation computation surface elevation...

... a number of hydrodynamic aspects of tandem mooring operations of floating VLCCS will be discussed.The ef- fect of shieldingof the wind and current on the export tanker are establishedby means of model test experiments. The in- teraction of two floatingvessels on the wave drift forces exertedon each other...

... frequency amplitude reaction force high frequency motion equation wave drift force proceedings model test simulation chain-turret-moored tanker upstream oil & gas tanker frequency motion technology conference procedure wave frequency surge motion mooring system moored...

...OTC 6595 Higher-Order Spectral Estimation of Drift Force QFRF s for Random Waves S.B, Kim, E.J. Powers, and R.W, Miksad, Offshore Technology Research Center, U. of Texas, and C,H, Kim and S.Y. Boo, Texas A&M U. Copyright 1991, Offshore Technology Conference This pspsr was presented at the 23rd...

... spectra turbulence drift force wind speed model test wind spectrum wind velocity computation wave drift force tanker surge motion wind spectra frequencymotion wind force wave spectrum resultsof tot spectral density frequency spectrum upstream oil & gas OTC 6605...

... a distinction is made between a stationary and dynamic environment. bow hawser length tanker wave drift force steady wind upstream oil & gas otc 6219 current fluctuation houston resistance coefficient drift force offshore technology conference coefficient coordinate system simulation...

... ABSTRACT An analytical procedure to predict the additional damping of low frequency vessel motions associated with second order drift forces is presented. The method is based on use of first order wave-induced motion responses obtained from strip theory analysis which are applied...

... drift forces are calculated using results of three dimensional diffractionprograms or using results of algebraic methods, see Yue [2]. Due to the natural periods of the heave and pitch motions of the TLP alsodouble frequency or sum frequency wave excitation is addressed, see Pinkster etal. [3...

... hearn drift force aTe 5632 Wave Drift Damping Influences Upon the Time Domain Simulations of Moored Structures by G.E. Hearn, S.M. Lau, and K.C. Tong, * U. of Newcastle Upon Tyne 'Now with U. of Glasgow Copyright 1988 Offshore Technology Conference This paper was presented at the 20th Annual OTC...

... ABSTRACT In this paper the basic expressions for the computation of mean and low frequency second order wave drift forces on floating structures in directionally spread seas as can be derived from potential theory are discussed. The resultant expressions for the mean and slowly varying drift...

...OTe 5456 Recent Developments in the Analysis of Wave Drift Forces, Low-Frequency Damping and Response by R.G. Standing, W.J. Brendling, and D. Wilson, British Maritime Technology Copyright 1987 Offshore Technology Conference This paper was presented at the 19th Annual OTe in Houston. Texas. ApriI27...