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Author
Title Improved Design Method for Cambered Stepped Hulls with High Deadrise
URL
Publication Date
Date Accessioned
Degree MS
Discipline/Department Ocean Engineering
Degree Level masters
University/Publisher Virginia Tech
Abstract Eugene Clement developed a new design method to improve the performance of ultra-fast planing crafts. A planing craft uses the force generated from the flow of water over the bottom to lift the vessel without the use of the static buoyancy force that classic boat designs rely on. Clement wanted to improve the performance of the planing vessel by reducing the total drag force caused by the flow of water on the bottom of the vessel. ClementâĂŹs design method involves reducing the wetted surface area which reduces drag. Reducing the wetted surface area would normally cause the lifting force on the vessel to reduce, but with the addition of curvature in the smaller wetted surface area, the lifting force would remain the same. ClementâĂŹs new design method requires multiple iterations to obtain an optimal design. The method limits the angle of the vessels bottom relative to horizontal to under 15 degree. The goal of this thesis is to create a new design method for planing vessels with bottoms that have an incline of 15 degrees or more relative to horizontal. The design method is created using Computational Fluid Dynamics (CFD) solver to model the planing surface moving through water. The CFD solver is validated with experimental test performed at the United States Naval Academy. The improved design method uses equations that can predict the forces and other design characteristics based on the desired vessel weight and seakeeping requirements.
Subjects/Keywords CFD; Planing Surface; Cambered Step Hull
Contributors Brizzolara, Stefano (committeechair); Paterson, Eric G. (committee member); Brown, Alan J. (committee member)
Rights In Copyright
http://rightsstatements.org/vocab/InC/1.0/
Country of Publication us
Record ID handle:10919/90298
Repository vt
Date Retrieved
Date Indexed 2020-10-14
Grantor Virginia Polytechnic Institute and State University
Issued Date 2019-06-18 00:00:00
Note [degree] Master of Science;

Sample Search Hits | Sample Images | Cited Works

…List of Figures 1.1 Pressure Distribution on Flat Planing Surface [9] . . . . . . . . . . . . . . . 2 1.2 Waterlines on Planing Surface with Deadrise [9] . . . . . . . . . . . . . . . . 2 1.3 Cambered Step Planing Hull

…as having a volumetric Froude number greater than 3.0. The work presented in this paper is conducting in the planing regime where the volumetric Froude number is greater than 3.0. F n∇ = q 1.2 V g∇1/3 (1.2) Planing Hull Theory The…

…line is represented by line from point O to point B. Figure 1.2: Waterlines on Planing Surface with Deadrise [9] 1.3. Clement’s Dynaplane Concept 1.3 3 Clement’s Dynaplane Concept The planing hull design can be modified with the…

…by the small shaded region at the stern of the planing hull. Clement’s design process for the cambered section is presented in Section 1.3.1. Figure 1.3: Cambered Step Planing Hull [4] 1.3.1 Clement’s Cambered Step Design Procedure The…

…x5B;4] . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4 Deadrise Angle versus Trim Angle for Cambered Planing Surface [4] . . . . . 4 1.5 Spray Root Line to Centerline Angle from Plan View γ Versus Trim Angle τ with Varying…

…Deadrise Angle β for Prismatic Planing Surface [4] . . . . . . . 5 1.6 Sweep Angle of 50% Chord φ Versus Spray Root Line to Centerline Angle γ for lt /b = 0.2 [4] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6…

…1.7 Step Sweep Angle θ Versus Spray Root Line to Centerline Angle γ [4] . . . . 7 1.8 Lift Coefficient with Deadrise versus Lift Coefficient without Deadrise for Prismatic (Uncambered) Planing Surfaces [4]…

…8 1.9 Cambered Planing Surfaces - Corrections for Sweep back Angle to Lift and L/D [4] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.10 Lift/Drag versus CLb0 for Rectangular Planing Surfaces Having…

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