... roll amplitude forward speed bilge keel fn 0 roll damping ship harmonic forced roll damping reservoir simulation coefficient dist free surface roll motion rudder background region naval hydrodynamic mesh size experiment ABSTRACT Roll damping is an input parameter...

...) used dynamic mesh and overlapping mesh technology to simulate roll attenuation of DTMB5415 ship, and uncertainty analysis was carried out. mono-hull ship round bilge hull nonlinear roll angle ship type shipbuilding bilge keel characteristic roll angle marine transportation round bilge...

... relative wave motion prediction freeboard assessment floating production system riser engineering bilge keel nonlinear effect asymmetric riser quarter sea offshore frequency midship subsea system head sea estimation upstream oil & gas green water fpso ABSTRACT Many...

... such as Reynolds or Froude are not satisfied for the drag forces. wind tunnel test numerical simulation experimental result force coefficient coefficient ocean basin test velocity profile boundary layer form drag maximum cx current load coefficient basin test bilge keel pressure distribution...

... Abstract The roll damping of a conventional ship cross-section, equipped with bilge-keels, is studied using an efficient, hybrid numerical code called PVC3D, based on Finite Volume Method, for different oscillation periods and amplitudes. It is shown that the linear free-surface boundary...

... analyzed to deduce a 4-degree of freedom equations of motion and to estimate manoeuvring coefficients in the equations of motion. ship magnitude emergence static heel test result characteristic history bilge keel heel angle model ship equation mathematical model passenger transportation...

... ABSTRACT Bilge keels of FPSO units are often connected to the vessel hull through doubler plates. These connections are difficult to inspect in-service. Fatigue tests are performed on the welds from doubler plate to vessel hull. A procedure is presented to calculate the fatigue strength...

... ABSTRACT In the structural design of bilge keels, hydrodynamic loads may threaten the structural integrity of both the bilge keel and of the hull itself. In the former case, it is the direct load from differential pressure that causes bending and shear at the root of the bilge keel...

... ABSTRACT: This paper presents a validated methodology to calculate the oscillatory loads on bilge keels of ships operating at zero forward speed in irregular sea states. To calculate these loads, the local relative fluid velocities acting normal to the bilge keel are combined with a KC...

... demonstrated. Lastly, the effect of bilge keels on the prevention of parametric roll is investigated. KEY WORDS: Parametric roll; tumblehome hull; nonlinear dynamics; bilge keel. INTRODUCTION Recently, a tumblehome vessel is under development as a new generation high-speed monohull ship. Tumblehome hull could...

... performed. For a proper comparison, hull in fully appended configuration, (i.e. with the rudders, bilge keels, fins, and propeller apparatus, including struts, A-brackets and the propeller shaft) has been considered. To properly understand the effect of the rotating propeller on the roll damping, model...

... issue of viscous roll damping simulation for ship in forced roll motion. multi-block mesh principia mesh ship sea-keeping simulation sea-keeping simulation upstream oil & gas reservoir simulation bilge keel roll angle simulation dynamometer numerical simulation hull cfd code...

..., TX, USA ABSTRACT The objective of this research is to model the physics of the separated unsteady viscous flow over the bilge keels of an FPSO hull subject to roll motions. A cell center based Finite Volume Method (FVM) scheme is implemented for the solution of the 2-D Navier-Stokes equations (NS2D...

... ABSTRACT The objective of this research is to understand the physics of the separated unsteady viscous flow over the bilge keels of an FPSO hull subject to roll motions and to predict the corresponding hydrodynamic coefficients. A numerical scheme which is based on the Finite Volume Method...

... show the results plotted in order to estimate the damping coefficients. We use a method based upon Himeno (1981) to predict the model roll damping and by adding a small bilge keel are able to match the experimental results. What was done to extrapolate the full-scale roll damping was to essentially use...

... ABSTRACT Several roll motion reduction devices are reviewed and suggested for the application in FPSO. The firstly suggested solution is the shape of the bilge. The next is a bilge keel. The last suggestion is the ART (antirolling tank). Typical U-tube type ART is designed for a FPSO...

... shedding strength from bilge keels and pressure distribution on the hull surface generated by them are taken into account. The predicted results are compared with experimental results to confirm the accuracy of the prediction method. Using the method some effects on the roll damping of a FPSO...

... cylinder bilge keel coefficient vorticity-diffusion theory time history free-surface random-vortex method configuration bilge-keel configuration free surface boundary condition roll hydrodynamic blob hydrodynamic coefficient frequency amplitude fsrvm Sway and Roll Hydrodynamics...

... equations in the case of separated flows due to the oscillating flow past a 2-D vertical plate is developed and validated with measurements from an existing experiment. KEYWORDS: CFD; Bilge keel; Separated flow; Oscillating flow INTRODUCTION FPSO hulls have often been found to be subject to excessive roll...

... loading condition roll amplitude anti-roll device subsea system roll natural period fpso radiation roll motion decay test stationary vessel equation amplitude bilge keel reynolds number coefficient natural period ship initial angle dimension swell condition floating...