... and turbulence. However, CFD tools are often seen as computationally expensive and prohibitive in a design environment. One of the main issues that impacts the use of CFD tools is numerical ventilation, when air is artificially entrained beneath the hull while using the Volume of Fluid (VOF) scheme to model...

... The use of Dr. Savitsky's empirical methods for the hydrodynamic design of planing hulls is widespread in industry and academia. In spite of their common use, their implementations are frequently inconsistent among their users. This makes it difficult to share and replicate exact results...

... An effective method to reduce ship drag is to supply air under specially profiled bottom with the purpose to decrease wetted surface area of the hull and thus its water resistance. Although such systems have been installed on some vessels, the broad implementation of this technique has not yet...

... In this study the impact of sweep angle on stepped hull resistance, running attitude, and dynamic stability is investigated for a range of planing speeds from ventilation inception ( ≈2) to high planing speeds ( ≈7) using RANS CFD. Potential performance benefits of the step are isolated...

... The design of any stepped planning hull configuration is complex and the design of Dynaplane craft is no different and even more complex. The potential for the Dynaplane concept is clearly demonstrated by theory, but the practical superiority has not yet been conclusively demonstrated...

... the Quadrimaran and planning the R&D.) ship hull hockberger fuel consumption horsepower marine transportation daniel tollet quadrimaran quadrimaran reexamined william tunnel displacement roxelane deadweight construction knot qih aerodynamic lift quadrimaran concept The Quadrimaran...

... Froude laws are inductive therefore not universally applicable. The relation between Froude and Kelvin, and Froude and Wigley are made explicit. Transonic Hull (TH) has hydrodynamic characteristics not predictable by Froude’s laws. In Transonic Hydrofield (THF) Theory TH’s 3-D triangular shape...

..., these methods lack in usefulness when the solution of a design tool is visual in nature, such as the distribution of pressures on a hull. This paper will outline a new method of metamodeling applied to distributed data. While current metamodeling methods are useful in automated design environments...

... strategic reduction in structural weight. Structural design depends on the hull bottom pressures while information about the magnitudes of peak pressures, time durations, and locations along the hull is generally not available. Model tests conducted at the US Naval Academy have measured bottom pressures...

... management discretization hull domain sensitivity guideline model 5415 experimental data aegir best practice geometry leapstoaegir function verification validation best practice case Verification, Validation, and Best Practices for a High-Order, Potential-Flow Boundary Element Method W. James...

... ratios and transom immersion for the lowest total resistance at different Froude numbers, and appropriate hull lengths to achieve highest possible fuel efficiency for different drafts at speeds between 24 and 33 knots. These slenderness ratios, for lowest drag force, were determined at different Froude...

... compared to current craft. For close to a century, the influence of ground effect has promised economy for low-skimming flight over smooth water (Raymond 1921), a promise that has yet to reach its full potential. passenger transportation bridging hull upstream oil & gas airfoil aerodynamic...

... froude number resistance hull aspect ratio wetted surface marine transportation total resistance wetted length coefficient theoretical study A Theoretical Study of the Optimal Dynaplane Vessel Lawrence J. Doctors The University of New South Wales Sydney, NSW 2052, Australia Keywords Dynaplane...

... Slamming is an important design consideration for aluminum vehicles, which must endure repeated impact events when operating at high speed in waves. An experimental study of a free-falling aluminum wedge hull is presented to measure the loading conditions and structural response of the bottom...

.... These test results have confirmed basic Sea Train expectations and are presented in the paper. rail transportation demonstration high speed trimaran assembly marine transportation resistance hst ground transportation ship hull forward unit configuration seatrain freight & logistics...

... A new methodology for hydrodynamic optimization of a TriSWACH is developed, which considers the shape of the center hull only and its optimal results are not influenced by the position configuration of side hulls. In order to accelerate the process of the optimization, a practical multi...

... A novel wedge-shaped hull form is optimized for reduced drag using a further developed practical hydrodynamic optimization tool. The hull features a sharp entrance angle, rectilinear sides, sharp bottom edges, a triangular waterplane and a linear aftward taper from a deep bow to a shallow...

... The paper presents recent research conducted within the NATO RTO Task Group AVT-204 “Assess the Ability to Optimize Hull Forms of Sea Vehicles for Best Performance in a Sea Environment.” The objective is the improvement of the hydrodynamic performances (resistance/powering requirements...

... A numerical model is being developed to solve for six-degree-of-freedom forces experienced by a cavitating, stepped planing hull. An approach to solving the cavitation or ventilation problem is described. Next a method for solving for spray roots on the hull is detailed and a method...

... Observations by crew of high-speed planing boats and sea trial tests have indicated that high-speed planing hulls suffer poor longitudinal and transverse instabilities, and boat may experience unfavorable motions due to any small environmental excitation. In this regard, dynamic motions...