... 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...

... of the Morison equation which also happens to be linear shows promise for the universal prediction of hydrodynamic forces. 1. Introduction Many types of slender marine structures in the offshore industry are affected by hydrodynamic interaction. This interaction must certainly be considered whenever the level...

.... 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 marginal fields, new offshore structure...

...aTe 6608 Nonlinear and Non-Gaussian Aspects of Morison Equation Induced Fatigue Damage Jin Wang and L.D. Lutes, Texas A&M U. Copyright 1991, Offshore Technology Conference This paper was presented at the 23rd Annual OTC in Houston, Texas, May 6-9,1991. This paper was selected for presentation...

... 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...

... cylinder offshore pipeline velocity field morison equation submerged pipeline reynolds number velocity ratio coefficient wave theory particle kinematic airy wave theory elevation order wave theory drag force equation superposition simultaneous measurement upstream oil & gas...

... 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...

... 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...

..., has come to be known as the "Morison equation". However, as the size of the object in relation to the wave length increases, the simplifying assumptions upon which the Morison equation is based are eventually violated and this simple relationship no longer yields valid results. The incident wave...

... 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...