...Quang V. Huynh; Thai G. Tran _ Accurate prediction of planing hull resistance is a difficult task due to complex hydrodynamic interactions at high speeds and is often performed by three methods: model testing, empirical formulas, and computational fluid dynamics (CFD). Model testing provides...

...Andrew Ricks; Michael Gorts Morabito; Raju Datla _ A stepped planing hull is a type of high-speed boat with a transverse break in the bottom of the hull. The step allows the hull to run at a higher trim angle, and also reduces the wetted surface area at planing speeds because of a pocket of air...

...Thai Gia Tran; Ha Vu Nguyen; Quang Van Huynh Hull optimization is an important aspect of ship design to improve safety and economic-technical efficiency for ships. This problem has been studied for a long time and has achieved many significant results, but in practical applications, there are still...

...Michael R. Davis _ High-speed ferries of around 100mlength cruising at around 40 knots can cause significant passenger discomfort in head waves. This is due to the frequencies of encountering waves, of maximum hull response to encountered waves and of maximum passenger discomfort all falling within...

.... Predictions of the body force thrust, sinkage, and trim use a speed controller for attaining self-propulsion. Two methods for water-jet performance are used: 1) evaluation of forces based on integration of the stress over the wetted area of the hull and water-jet duct, pump casing, and nozzle (integral method...

... insight to the vessel’s stability characteristics, propulsion, and dynamic loading environment during the attack. In addition, a discussion of possible loss scenarios, informed by both calculation results and inspections of vessel’s hull, is presented. Although the story of what happened to H. L. Hunley...

...John C. Daidola The effects of hull roughness on ship maneuvering characteristics are investigated. The hydrodynamic derivatives in the equations of motion for surface vessel maneuvering are modified to incorporate roughness of the hull and rudder. Vessel lifetime roughness profiles are postulated...

...Jeonghwa Seo; Hoe-Seong Jeong; Shin Hyung Rhee; Kyogun Chang The present study concerns a series of model tests in a towing tank on waterjet propulsive performance. The test model was an armored vehicle consisting of a box-shaped hull, two waterjets, a bow flap, and a trim tab. As per the powering...

... of the Office of Naval Research Tumblehome (ONRT) hull have been computed at different three model scales by using the overset mesh technique. The full-scale resistance and nominal wake fraction of the ONRT hull have been estimated by using Telfer’s GEOSIM method. Resistance and nominal wake fraction have...

..., retaining the accuracy of the incident waves. A parametric study is performed under regular wave conditions with 3Degree of Freedom (DOF) motions of the hull. The results are compared with the large literature available. An additional case is simulated to demonstrate the capability of the present method...

...Nicola Petacco; Giuliano Vernengo; Diego Villa; Antonio Coppedé; Paola Gualeni The sensitivity of ship stability performance in waves to geometric variation has been investigated by means of a simulation-based design framework. The study was devoted to assess the influence of hull geometry...

... reservoir surveillance drag reduction flow rate bulk carrier operation air layer injection hole injection rate resistance injection flow rate reduction freight & logistics services marine transportation knot diameter investigation air bubble sustainable development hull cfm...

...Qiang Zheng; Hai-Chao Chang; Zu-Yuan Liu; Bai-Wei Feng Hull optimization design based on computational fluid dynamics (CFD) is a highly computationally intensive complex engineering problem. Because of reasons such as many variables, spatially complex design performance, and huge computational...

... layer (TBL) over the hull and to use an unstructured grid with the appropriate resolution relative to this thickness. Expressions from the literature for the scaling of the computational cost, in terms of the grid size, with Reynolds number, are adapted in this application. It is shown that WMLES...

... a range of speeds and angles of attack. Particular attention was paid to the effect of sharp features along the hulls of the two vehicles and how they affect the observed flow regime. It has been shown that the new design, which uses a bow shape designed to encourage natural laminar flow, benefits from...

... of Ikeda's method, and the accuracy of the computed damping coefficient is low (Kawahara et al. 2012). 1 6 2019 1 6 2019 2019. The Society of Naval Architects and Marine Engineers Reservoir Characterization Froude number Simulation Fluid Dynamics ship hull appendage coefficient...

...Abbas Dashtimanesh; Hossein Enshaei; Sasan Tavakoli In the present article, it has been tried to compute hydrodynamic forces and moments in coupled sway, roll, and yaw motions of planing hulls. For this purpose, wedge water entry has been considered in its generalized form with vertical, horizontal...

.... The Society of Naval Architects and Marine Engineers Artificial Intelligence generating curve hull Upstream Oil & Gas section curve application june 2017 representation optimization problem variation geometry optimization algorithm constraint optimization control point deformation...

...Andrea Mola; Luca Heltai; Antonio DeSimone We present a model for the fast evaluation of the total drag of ship hulls operating in both wet and dry transom stern conditions, in calm or wavy water, based on the combination of an unsteady semi-Lagrangian potential flow formulation with fully...

... on the onset of flow separation from the hull and skeg of the tug, the model-scale simulations under-predict the maximum steering force by 12% relative to the full-scale simulations. In addition, we provide a method for converting the hydrodynamic forces of the CFD escort study into towline and thrust forces...