... into standard industry practice (API, DNV and ISO). This is a simple improvement to the original Morison equation (Morison et al. [ 2 ]), which predicts forces using the undisturbed open ocean flow properties. New work shows that unsteady large waves on top of a steady current introduces additional blockage...

...@9 l OTC 8064 The Validity of Morison Equation Extensions M. Shafiee-far, and W.W. Massie, and J.H. Vugts, DeIft University of Technology Ccpynaht i SS6 OFFSHORE TECHNOLOGY CONFERENCE Th$ pap+r was p$ep.rti lW Vesent aton at ths offshore Tec+mokgy Con fenmma held m Houston Texas, 6-9 May 1%36 Th!s...

... of corresponding horizontal cylinders. The calculated forces using Morison equation through the use of experimentally determined inertia and drag coefficients is found to be in good agreement with the meas-ired forces at low KC numbers. INTRODUCTION With the necessity of reducing the capital cost in exploring...

... Abstract Simulation results are presented for the fatigue damage caused by the nonlinear and non-Gaussian structural response induced by the Morison equation wave loading. Four versions of the Morison equation are considered, and various response characteristics are identified as factors...

... and an analysis of the force records through Morison's equation. INTRODUCTION Hydraulics Research has been engaged for more than 15 years in a continuous program of research into hydrodynamic forces on marine pipelines. The first element of the investigation consisted of field measurements on a pipeline...

... that interaction of the cylinder with its own wake is extremely important. Strong vortex shedding effects throughout all of the experiments were evident. Large transverse forces were observed at Reynolds numbers over 10 6 " The Morison equation proves to be a good model of the forces. Comparisons are made...

... ABSTRACT Laboratory measurements of the total in line forces on a fixed vertical 2-in. diameter cyl1nder in deep-water regular and random waves are given and compared with predictions from the Morison equation. Results show, for regular waves which heights ranging from 2 to 22...

... frequency mechanical oscillation force coefficient hydrodynamic coefficient free tower drag coefficient particle kinematic instrumented section coefficient water particle velocity kc number relative velocity morison equation cylinder dependence reynolds number equation...

... in both directions becomes mono-harmonic with a frequency of 2f w . Vortex shedding "lock-in" is shown to produce substantial dynamic amplification of deflection not only in the transverse direction but also in the in-line direction. The Morison equation so widely used in engineering practice to estimate...

... compared to values predicted by the Morison equation. The major input parameters required by this equation were the water particle kinematics of velocity and acceleration and the coefficients of drag and inertia. The horizontal velocity fields of the combined wave-current condition and the coefficient...

... morison equation transfer function wave theory offshore structure force coefficient subsea system design wave coefficient wave force structural member loading otc paper wave height platform hydrodynamic loading cylinder upstream oil & gas regime engineer equation offshore...

...) presenta- tion of drag, lift, and inertia coefficients that can be used in the Morison equation in combinationwith._ Stokes' third-order wave theory. 217 where Fdim = dimensionless force Fmax = maximum measured force y = -specific weight of water H = wave height L =-wavelength V = volume of model (total...

... that the wave force was increased significantly and a simple analysis using the Morison equation indicated that the drag coefficient had been increased by around &l~. It is suggested that these results_are relevant to full scale structures. INTRODUCTION Offshore structures suffer a prolific accretion of marine...

... ABSTRACT A general form of -wave force equation applicable to a small submerged or semi-submerged randomly-oriented tube is suggested. The formulation is a generalization of the so-called Morison equation used for a vertical tube. Two methods of analyzing hydrodynamic coefficients in the form...

... that this equation reduces to the inertial term of the Morison equation for small objects (i.e., £l«L). (5) (2) horizontal force component mass coefficient to account for disturbance of flow due to pre- sence of object object dimension perpendicular to direction of wave travel object dimension perpendicular...

... is the added-mass coefficient, and the local fluid acceleration. The, expression for wave force which involves these two terms was originally applied by Morison, Johnson and O'Brien 1 in the study of wave forces on piles and; consequently, has come to be known as the "Morison equation". However, as the size...

... are related to the total force by means Wave Force Project II (1960-1963). During of the drag and inertial force coefficient, the first project, wave profile and force CD and CM, respectively. Two primary limita- data were recorded from hurricanes Flossy tions associated with the Morison equation (1956...