Abstract A towing tank is utilized to investigate the flow field around a two-dimensional submerged foil model operating near free surface. Free surface effects are analyzed for steady and unsteady velocity. The model’s submergence depth angle of attack varied. Tests conducted facing upside-up upside-down. deflection recorded experimental results validate an analytic that deployed predict wake ...

The power requirement of a ship propulsion system is directly proportional to the fuel consumption and emissions released. By reducing engine power, can be reduced. One energy saving devices (ESDs) that positioned in region between stern hull propeller pre-duct. ESD improve propulsive coefficient system. This research explains effect circular pre-duct on hull-propeller interaction. A numerical ...

Moonpool is an opening in the floor or base of a hull ship which can be used to lower tools and vehicles into the sea in a protected area. In this paper, the effect of a rectangular cross section moonpool on the resistance force of a supply vessel was investigated both by experimental and numerical methods. For both methods a 1:37.2 scale of Caspian3 surface vessel was used. Experiments were ca...

Catamaran added V-like center bow (INCAT) is investigated as a wave-piercing vessel to decrease vertical acceleration and diminish slam events during sea-keeping operation. The catamaran and the vessel bow were modeled and the vertical acceleration of model was validated with experimenal test. The geometry of V-like center-bow such as slope of center bow and elevation from demi-hulls was optimi...

This paper proposes the adaptation of Support Vector Data Description (SVDD) to the multiple kernel case (MK-SVDD), based on SimpleMKL. It also introduces a variant called Slim-MK-SVDD that is able to produce a tighter frontier around the data. For the sake of comparison, the equivalent methods are also developed for One-Class SVM, known to be very similar to SVDD for certain shapes of kernels....

Impact of the satellite data assimilation on the naval undersea capability is investigated using the ocean hydrographic data without and with satellite data assimilation. The former is the Navy’s Global Digital Environmental Model (GDEM) providing the monthly mean; and the latter is the Modular Ocean Data Assimilation System (MODAS) proving the synoptic data. The two environmental datasets are ...

The results from resistance measurements in calm water and load-varying self-propulsion tests regular head following waves are presented. experimental campaign is conducted the large towing tank at SINTEF Ocean (formerly MARINTEK). openly accessible hull of single screw Duisburg Test Case selected as test case. wave added resistance, ship motions RAOs, axial wake fraction, thrust deduction rela...

Flapping foils for augmenting thrust production have drawn attention as a means of assisting ship propulsion in waves due to their high efficiency rate compared traditional screw propellers. However, they can also offer substantial resistance reduction when used stabilizers. In this work, the aim is investigate feasibility symbiotic concept combining ship’s propeller with foil arranged at bow f...