..., knowledge of their joint occurrence is important as the persistence duration (i.e., the duration of the sea state persistence above or beneath a given level) and the seasonal dependence of wind and waves appear to be of large interest. However, such a modeling becomes difficult as the number of considered...

...S. Narayanan; S. C. S. Yim The highly nonlinear responses of compliant ocean structures characterized by a large-geometry restoring force and coupled fluid-structure interaction excitation are of great interest to ocean and coastal engineers. Practical modeling, parameter identification...

...Harald E. Krogstad; Stephen F. Barstow Expressions for the maximum crest height are reviewed and tested on data from five different sensors in the WACSIS data set. The overall agreement is good and the analysis supports that second-order models give accurate expressions for the distribution...

...Robert E. Melchers Reliability theory for the assessment of existing structures for remaining safe life must consider the probabilistic deterioration of structural strength as well as multiple applied loadings. This requires good-quality models of deterioration processes. Models for corrosion...

.... However, nearly all analyses are deterministic in nature and do not account for the inherent variability in governing parameters and models. In this paper, probabilistic models are used to develop an understanding of the response behavior of jack-ups, with particular emphasis placed on the extreme deck...

...Robert E. Melchers In Part 1 of this paper, it was shown that statistical models using pooled data are of poor quality with very wide variability. The present paper considers probabilistic corrosion modelling based on corrosion mechanics principles and notes the effect of environmental and other...

... length, along with various numerical aspects related to the mathematical modelling and to the convergence and accuracy of the obtained solutions. Numerical solutions are presented for a wide range of harsh weather type, environmental parameters. The mean drift force 1 on the other hand, which also...

...” of coordinates. This paper presents a model of irregular waves based on superposition of linear Lagrangian wave components, using an iterative method to obtain the Eulerian solution. This approach yields theoretically consistent results everywhere in the waves, and comparisons with wave flume measurements show...

... beam elements to model the large displacements and rotations of the pipeline. The penalty method is used with spring-contact elements to accurately represent the actual boundary conditions on both the stinger and the sea floor. A comparison with a finite element formulation introduced by the authors...

...J. W. Kim; K. J. Bai; R. C. Ertekin; W. C. Webster Recently, the authors have derived a new approximate model for the nonlinear water waves, the Irrotational Green-Naghdi (IGN) model. In this paper, we first derive the IGN equations applicable to variable water depth, and then perform numerical...

...Johan E. W. Wichers Maneuvering models for tanker based FPSOs are somewhat different from the classical maneuvering models. The reasons are zero or low forward speed (current), large mean drift angles, small values of rate of turn and relatively large low frequency (lf) transverse and yaw motions...

...Bernt J. Leira; Qiaofeng Chen; Asgeir J. Sørensen; Carl M. Larsen The present paper is concerned with modeling of riser response to static and dynamic loading. Focus is on top and bottom angles which are of crucial importance, e.g., during drilling and workover operations. Parametric studies...

...Joa˜o Paulo J. Matsuura, Graduate Student Research Assistant; Michael M. Bernitsas, Professor, Fellow ASME; Luis O. Garza-Rios, Research Fellow, Mem. ASME,; Kazuo Nishimoto, Professor Various hydrodynamic maneuvering models are available for modeling the slow motion horizontal plane dynamics...

... large crude carriers) have been converted to work as FPSOs. However, working as a stationary unit a VLCC presents directional stability problems. In the present paper a methodology is discussed to develop a mathematical model for the simulation and the verification of the stability of a VLCC working...

...J. S. Damgaard; J. White; M. Worsley Physical model tests have been performed with the aim of investigating the pull-in loads required to move a jumper assembly across the seabed. A total of 41 tests were completed with various assembly configurations, using two different types of sediment: sand...

...Bernt J. Leira; Tore Holma˚s; Kjell Herfjord Analysis and design of deep-water riser arrays requires that both collision frequency and resulting stresses in the pipes are addressed. Within a probabilistic context, the joint modeling of the current magnitude and surface floater motions must be taken...

...Stephen Liu ,, Editor publishing ships naval engineering structural engineering design engineering oceanography hydrodynamics modelling As a refereed technical journal, the Journal of Offshore Mechanics and Arctic Engineering (JOMAE) is unique in that the papers reflect...

... of the relative energy ratio and the peak frequency separation between the low and high frequency wave fields on the wave height distribution. Observed results are compared with predictions of probabilistic models adopted in practice. Comparisons of the empirical data with relevant probabilistic models reveals...

...Andrew Cosham A simple theoretical model for predicting the effect of tensile pre-strain on fracture toughness has been developed using the local approach. The HRR singularity is assumed to describe the stress-strain field around the crack tip. A stress-modified critical strain-controlled model...

... is complicated. Moreover, the wind-induced slow-drift oscillation is an important design criterion. Simulated environment in a model test often includes wind effect. Accurate modeling of wind in a laboratory environment is, however, a difficult task. The wind tunnel provides a steady load on the superstructure...