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Keywords: geometry
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Proceedings Papers
Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0031
... of as eigenmodes of the final geometry. The superpostion of the shapes represents the final design; this type of optimization is referred to as shape optimization since the shapes are provided and the solution provides the optimal weights for the superposition of the shapes; more details are provided below...
Proceedings Papers
Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0024
... revealed an asymmetry in the hull in the region of the bow, on the starboard side of the model. This as-measured geometry is available from NSWCCD by request as an IGES geometry file. The model s yaw alignment was achieved by alignment of the IGES file baseline with the direction of carriage travel. Speed...
Proceedings Papers
Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0043
... are debris containment structures developed to contain logs, present in hydropower plant. The towing tank tests are conducted for some types of log boom line geometry, varying the number of log boom modules, velocity, and the catenary curvature formed by the log boom line. The methodology is divided in some...
Proceedings Papers
Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0032
... the variety of operating conditions, hull geometries, loading conditions, and other attributes. The analytical seakeeping models should be based on the physical models of the hydrodynamic phenomena rather than case-specific empirical tuning. This paper describes a study that evaluated the ability of the Large...
Proceedings Papers
Paper presented at the SNAME 29th American Towing Tank Conference, August 11–13, 2010
Paper Number: SNAME-ATTC-2010-034
... was configured with two longitudinal and three transverse side hull (outrigger) spacings relative to the main hull. The paper discusses the model design, mounting technique and drag and pressure distribution measurements. The wind tunnel model hull geometry is a nominally 1/30 scale model of a preliminary...
Proceedings Papers
Paper presented at the SNAME 28th American Towing Tank Conference, August 8–10, 2007
Paper Number: SNAME-ATTC-2007-002
... The performance of a multi-unit wavemaker for generating directionally-spread waves has been studied using the three-dimensional, radiation-diffraction code WAMIT. Design choices of wavemaker geometry (including type of motion, total number of units and size of individual units) affects various...
Proceedings Papers
Paper presented at the SNAME 27th American Towing Tank Conference, August 6–7, 2004
Paper Number: SNAME-ATTC-2004-008
... by 3-D Systems, Inc. Open-water tests were performed on both the original and SL models, with measurements taken afterward to compare to the design geometry. It was found on the SL propeller that the pitch was about 2% lower than the original design, and the chord length was shorter as well. While...
Proceedings Papers
Paper presented at the SNAME 26th American Towing Tank Conference, July 23–24, 2001
Paper Number: SNAME-ATTC-2001-007
.... With the advent of NURBS surface representation of model propeller geometry, new propeller models have been manufactured with fall scale trailing edge details. Problems have arisen in achieving predicted open water performance. Discrepancies have been attributed to trailing edge flows over beveled edges...
Proceedings Papers
Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-015
... This paper describes the application of Non-Uniform Rational B-Spline (NURBS) surfaces for representation of propeller geometry. Use of NURBS surface representation can facilitate the generation of computational grids, the generation of tool paths for manufacturing, or the evaluation...
Proceedings Papers
Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-010
... boat modification equation transom manometry assumption coefficient experiment vorus configuration transducer savitsky hull formulation geometry variation full scale planing experiment calculation FULL SCALE PLANING EXPERIMENT AND ANALYSIS Richard A. Royce University ofMichigan...
Proceedings Papers
Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-019
... improvement variation separation marine transportation cavitation coupling inception foil vortex cavitation coefficient elastically coupled composite material upstream oil & gas propeller deflection reduction loading cavity geometry HYDROFOIL CAVITATION IMPROVEMENTS WITH ELASTICALLY...
Proceedings Papers
Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-005
... geometry, and test condition data will be provided on the DTMB Model 5415 web site when cleared for release. experiment probe geometry united states government ship north america government application froude number configuration future carrier concept marine transportation resistance...
Proceedings Papers
Paper presented at the SNAME 24th American Towing Tank Conference, November 2–3, 1995
Paper Number: SNAME-ATTC-1995-002
... ABSTRAC'l' The flow field around a fully venti lated two-dimensional hydrofoil of arbi trary geometry is considered. The presented theory is a non-linear, time marching, potential based boundar. y ele ment method. The perturbation potential on the cavity is a function of submer gence and time. The non...
Proceedings Papers
Paper presented at the SNAME 24th American Towing Tank Conference, November 2–3, 1995
Paper Number: SNAME-ATTC-1995-031
... and CFD. More detailed bow-flow data is obtained by taking measurements of the wave elevation with a point gauge very near the bow. In the CFD, the bow flow is resolved in more detail by using the real bow geometry instead of the simplified vertical zero-thickness bow used in previous studies, which...
Proceedings Papers
Paper presented at the SNAME 24th American Towing Tank Conference, November 2–3, 1995
Paper Number: SNAME-ATTC-1995-004
... hydraulic jet pump cavitation waterjet propulsion figure 4 figure 2 cavitation inception inlet cavitation tunnel semi-flush inlet geometry stricker multiphase pump npsh inlet efficiency cavitate diameter thrust artificial lift system efficiency ingestion figure 1 model...
Proceedings Papers
Paper presented at the SNAME 24th American Towing Tank Conference, November 2–3, 1995
Paper Number: SNAME-ATTC-1995-024
... a method of feasible directions algorithm. numerical optimization technology cambridge shen optimization problem cavitation performance symposium geometry massachusetts institute cavitation advanced blade section design department ma02139 foil coefficient section formulation ocean...
Proceedings Papers
Paper presented at the SNAME 23rd American Towing Tank Conference, June 11–12, 1992
Paper Number: SNAME-ATTC-1992-041
... school usa str str 0 main spray generated new orlean trajectory gravity university scaling geometry model latorre ryan hull Scaling of Main Spray Generated by Planing Surfaces S. Ryan (Tulane Medical School, USA) R. Latorre (University of New Orleans, USA) ABSTRACT This paper presents...
Proceedings Papers
Paper presented at the SNAME 23rd American Towing Tank Conference, June 11–12, 1992
Paper Number: SNAME-ATTC-1992-024
... reservoir characterization lcc production control test section upstream oil & gas reservoir surveillance noise diameter cavitation channel contraction diffuser evaluation trough international symposium geometry requirement consideration cavitation inception inc lcc test section...
Proceedings Papers
Paper presented at the SNAME 23rd American Towing Tank Conference, June 11–12, 1992
Paper Number: SNAME-ATTC-1992-017
... distribution cavitation application distribution circulation blade propeller efficiency geometry loading shaft propeller stator coefficient position inflow span asymmetric stator Design Method and Application of an Asymmetric Stator Upstream of an Inclined Shaft Propeller S.K Neely, J...
Proceedings Papers
Paper presented at the SNAME 23rd American Towing Tank Conference, June 11–12, 1992
Paper Number: SNAME-ATTC-1992-018
... A propeller design procedure incorporating new propeller blade sections has been developed to improve propeller cavitation inception. Two dimensional foil design procedures of Shen and Eppler provide geometry for a specified blade pressure distribution. Advanced propeller lifting surface design...
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