VERNENGO , Giuliano

To study new sail plans it is a common practice to use advanced CFD tools which are able to simulate in a accurate way almost all the aerodynamic complex phenomena typical of those systems. However, these analisys are very time consuming and this could make prohibitive their massive usage for long series of analysis. A way to solve this...

The hydrodynamic analysis of a new semi-small waterplane area twin hull (SWATH) suitable for various applications such as small and medium size passenger ferries is presented. This may be an attractive crossover configuration resulting from the merging of two classical shapes: a conventional SWATH and a fast catamaran. The final hull design...

A new numerical approach based on the Vortex Lattice Method (VLM) for the solution of the hydrodynamic performances of cambered hulls in steady planing is formulated and validated. Due to its fully 3D formulation, the method can be applied to both cambered and un-cambered dihedral planing surfaces of any shape without any further approximation....

The transportation by sea of compressed natural gas is a very recent subject, prompted by recent changes in the perspectives of a possible economic exploitation of relatively small quantities of this hydrocarbon, available as by-product of oil extraction in off-shore fields. An automatic and integrated preliminary design procedure has been...

No description

A new computational procedure based on a reformulated lifting line theory has been developed to represent the spanwise circulation distribution of super-cavitating hydrofoils. The vortex lattice method can consider fully submerged as well as surface piercing hydrofoils, incorporating an approximate model with free surface effects. The proposed...

The paper deals withthe theoretical and numerical aspects of a complete automatic optimization procedure which has been specifically devised to optimize the unconventional hull form design for a new USV (Unmanned Surface Vehicle). The related computational procedure integrates a parametric generation module for innovative and unconventional...

Achieving the right balance between fixed and operating costs is a key but non-trivial task for optimizing the characteristics of a fleet of ships for a new trade at a very early stage of the design. A wide range of design choices as well as a significant number of uncertainties related to the operation of the fleet affects those two expense...

Semi-Small Waterplane Area Twin Hull (Semi-SWATH) ferry is optimized by an automatic procedure with respect to seakeeping and resistance at different speeds. The numeric procedure is based on a fully parametric model of the unconventional hull form, a 3D linear Rankine sources panel method for the steady wave resistance and the...

Multi-hull vessels, including SWATH vehicles, are interesting design solutions for a number of marine applications, from coastal ferries to workboats. Some hybrid and unconventional configurations, able to combine good quality of more classic designs, appear to be also attractive. This is the case of Semi-SWATHs, that merge the stern shapes of...

A semi-SWATH (Small Waterplane Area Twin Hull) designed for littoral passenger transport service is optimized by a full automatic procedure with respect to seakeeping and resistance at different speeds. The computer assisted procedure is based on: A fully parametric model of the unconventional hull form, which guarantees ample shape changes...

The paper presents the main characteristics of an innovative platform which has been conceived and designed to extend the operational capabilities of current unmanned surface vehicles in terms of platform stability in waves and of powering requirement at a relatively high speed. The main idea which rules the project is the realization of a...

The energy efficiency evaluation of trawlers becomes more and more relevant as the trend of the government laws follows the path of restrictions to new constructions to encourage improvement to existing vessels, often equipped with outdated technologies. The two conditions a trawler need to meet during its operations, namely the sailing and the...

A computational framework to design a new family of unconventional supercavitating (SC) hydrofoils with optimized hydrodynamic performance is developed. A low‐order boundary element method is used to solve for the steady potential flow over the hydrofoil predicting its hydrodynamic characteristics, including the vapor–cavity interface. Shape...

The hydrodynamic performance of unconventional SWATH and Semi-SWATH for high speed applications are analyzed and compared in this paper. Bare hull resistance in calm water is estimated by an inviscid boundary element method with viscous corrections and verified by a fully turbulent, multiphase unsteady RANSE solver. Motions response in head...

No description

Hydrodynamic performance optimization of ship hulls by CFD methods is becoming popular in modern naval architecture. From local or partial parametric shape optimization, the current frontline of the research is to solve the global hull shape optimization by automatic computational procedures. Key of these procedures is in the parametric hull...