Open Access Theses and Dissertations

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You searched for subject:(Stepped hull). Showing records 1 – 2 of 2 total matches.

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Virginia Tech

1. Lee, Evan Joseph. Advancements of Stepped Planing Hulls.

Degree: PhD, Aerospace Engineering, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/51123 

The straight line calm water performance of stepped planing hulls has been studied experimentally, by prediction method, and numerically. A model test was conducted to provide a systematic understanding of the effects that displacement and step location have on the performance of a stepped planing hull. Ten different step configurations were tested at three different displacements and over a range of four different speeds in calm water. Seven of these configurations were tested at two different Longitudinal Center of Gravity (LCG) locations. Of all the configurations tested, the stepped hull configurations showed reduced resistance compared to the unstepped hull. The configurations with the largest step height aft showed the least amount of resistance over the speed range tested. Increasing displacement and shifting LCG had similar effects on craft performance for both stepped and unstepped hulls. The current stepped hull prediction method was expanded to include a three dimension wave profile and the ability for the stagnation line to cross the step. Using previous model test data and existing two dimension wave profile equations, a single equation was developed to predict the three dimension wave profile aft of a step. Formulations were added to Savitsky's planing prediction method to include very high speed craft and chines dry conditions. Lastly, two simulations were performed using two computational fluid dynamics numerical tools, OpenFOAM, and NFA. The results of these simulations were compared to the experimental test results to assess each code's relative strengths and weaknesses for use in detail design of stepped planing craft. Advisors/Committee Members: McCue-Weil, Leigh S. (committeechair), Neu, Wayne L. (committee member), Coats, Timothy (committee member), Brown, Alan J. (committee member).

Subjects/Keywords: Stepped Planing Hull; High Speed Craft; Hydrodynamics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lee, E. J. (2014). Advancements of Stepped Planing Hulls. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/51123

Chicago Manual of Style (16th Edition):

Lee, Evan Joseph. “Advancements of Stepped Planing Hulls.” 2014. Doctoral Dissertation, Virginia Tech. Accessed January 20, 2021. http://hdl.handle.net/10919/51123.

MLA Handbook (7th Edition):

Lee, Evan Joseph. “Advancements of Stepped Planing Hulls.” 2014. Web. 20 Jan 2021.

Vancouver:

Lee EJ. Advancements of Stepped Planing Hulls. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10919/51123.

Council of Science Editors:

Lee EJ. Advancements of Stepped Planing Hulls. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/51123

2. Kokkonen, Toni. CFD analysis of stepped planing vessels.

Degree: Mechanics, 2018, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250023 

High speed planing hulls are currently widely used for example in recreational and emergency vessel applications. However, very little CFD research has been done for planing vessels, especially for those with stepped hulls. A validated CFD method for planing stepped hulls could be a valuable improvement for the design phase of such hulls. In this thesis, a CFD method for stepped hulls, with a primary focus on two-step hulls, is developed using STAR-CCM+. As a secondary objective, porpoising instability of two-step hulls is investigated. The simulations are divided into two parts: In the first part a method is developed and validated with existing experimental and numerical data for a simple model scale planing hull with one step. In the second part the method is applied for two two-step hulls provided with Hydrolift AS. A maximum two degrees of freedom, trim and heave, are used, as well as RANS based k-w SST turbulence model and Volume of Fluid (VOF) as a free surface model. The results for the one-step hull mostly corresponded well with the validation data. For the two-step hulls, validation data did not exists and they were first simulated with a fixed trim and sinkage and compered between each other. In the simulations with free trim and heave both hulls experienced unstable porpoising behavior.

Subjects/Keywords: Computational Fluid Dynamics (CFD); Ship hydrodynamics; Planing hull; Stepped hull; STAR-CCM+; Overset mesh; Volume of fluid (VOF); Reynolds averaged Navier-Stokes equations (RANS); Dynamic instabilities; Engineering and Technology; Teknik och teknologier

…the simulations of this thesis. Moreover, a research on a model scale stepped hull performed… …investigating the stability and performance of a stepped planing hull. STAR-CCM+ is a widely used… …illustrating the wetted surface of a stepped hull [7] 9 3 | CFD Simulations 3.1… …x5D; Stepped hull simulations lack validated guidelines and recommendations. The setup for… …hull geometry was first used to validate a wellfunctioning simulation setup for a stepped… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kokkonen, T. (2018). CFD analysis of stepped planing vessels. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250023

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Kokkonen, Toni. “CFD analysis of stepped planing vessels.” 2018. Thesis, KTH. Accessed January 20, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250023.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Kokkonen, Toni. “CFD analysis of stepped planing vessels.” 2018. Web. 20 Jan 2021.

Vancouver:

Kokkonen T. CFD analysis of stepped planing vessels. [Internet] [Thesis]. KTH; 2018. [cited 2021 Jan 20]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250023.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kokkonen T. CFD analysis of stepped planing vessels. [Thesis]. KTH; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250023

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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