Numerical prediction of hydrodynamic forces on a moored ship due to a passing ship

Abstract

The passing ship effect on berthed vessel is a well-known problem and is studied over many years. These interaction effects induce dynamic loads in the mooring system that can exceed the design values and lead to severe accidents. A study has been conducted to analyze the effect of various parameters such as passing ship speed, separation distance, depth to draft ratio and waterway geometry on the hydrodynamic interaction effects between berthed and a passing ship. Numerical simulation for three-dimensional unsteady viscous flow have been conducted using the overset mesh methodology and solving the Reynolds-averaged Navier-Stokes equations with k-v shear-stress transport turbulence model for various cases, and interaction effect on berthed ship have been calculated. The method recommended in this study is validated by comparing the computational fluid dynamics (numerical) results with existing model scale experiments and mathematical curves from empirical formulas. The hydrodynamic interaction forces are computed for five types of waterway geometries. The magnitude and time histories of the forces and moment on the moored ship for various cases are analyzed to evaluate the effect of various parameters such as waterway geometries and separation distance. The results and conclusions made by this study can give definite guidance on safe maneuvering of a ship passing by a moored ship.

Structural load monitoring of floating mooring column and its application on optimal regulation for water conveyance system operation of sea shiplock

“…The narrow and long hydraulic structure of the lock chamber and the relatively static water environment result in the longitudinal component of the mooring load of the ship being the main factor affecting mooring safety (Verelst et al, 2018;Kašpar, 2022). The hydrodynamic force, wave force and other factors between the ships are of relatively smaller concern (Pawar et al, 2018;Sakakibara et al, 2018;Van Den Van and Van Loon, 2018). The ship moored near the shiplock may experience complex hydrodynamic interaction between the ships and the adjacent shiplock structure, an efficient and accurate time-domain model was developed to deal with nonlinear effects by Zou et al (2023), which are difficult to solve in frequency-domain models, such as mooring force and operation and installation loads.…”

Application of an Analytic Methodology to Estimate the Movements of Moored Vessels Based on Forecast Data

“…In addition, for a physical model to be reliable, it is important to assure that the model is accurate and realistic, which is achieved by costly construction and intense calibration [9,10]. On the other hand, although the advancement of numerical models facilitates the analysis of the behavior of a moored vessel and the influence on it of the mooring configurations or the effect of passing ships with lower computational and economic costs [11][12][13], these tools also have similar limitations as the physical models, such as the disadvantage of not reproducing the variations experienced by the position of the vessel's center of gravity during the cargo operation. Therefore, using these two methodologies it is possible to analyze a specific loading condition (ship fully loaded, ballasted, etc.)…”