Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

Dates: Last 2 Years

You searched for subject:(Planing Hull). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Virginia Tech

1. Li, Jiahui. Verification and Validation Study of OpenFOAM on the Generic Prismatic Planing Hull Form.

Degree: MS, Ocean Engineering, 2019, Virginia Tech

The paper presents the first series of results obtained in an ongoing validation and verification study of inter-dynamic OpenFOAM solver framework on a new set of high quality experimental tests performed on a large (2.4m long) generic planing hull model (GPPH) with high deadrise (18deg), from the pre-planning (Fn∇=2.6) to fully planing (Fn∇=5.7) regimes. This test case is a good benchmark for the free surface capturing model implemented in OpenFOAM which is based on a rather simple transport equation for an additional scalar field that defines the fraction of water in each cell of the computational mesh. This model, in spite of its simplicity, seems capable of reproducing complex violent free surface flows such as that observed in planing hulls, that includes jet spray forming on the bottom and detaching from the chine of the planing hull and overturning waves off the wet chine region, with some nuances. The dependence of the flow solution on the mesh quality is presented and discussed. Practical indication of the level of uncertainty of CFD models for the prediction of the calm water hydrodynamics of the GPPH is given at the highest simulated speed using both fixed and free attitude simulation solutions. Predictions are then extended to the whole speed range, including resistance components, dynamic trim, heave, wetted chine length, and wetted keel length.The effect due to algorithms is also discussed by modifying the settings in wall functions and solvers for the improvements of future simulation. Advisors/Committee Members: Brizzolara, Stefano (committeechair), Brown, Alan J. (committee member), Paterson, Eric G. (committee member).

Subjects/Keywords: Planing Hull; GPPH; OpenFOAM; URANS

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Li, J. (2019). Verification and Validation Study of OpenFOAM on the Generic Prismatic Planing Hull Form. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/89904

Chicago Manual of Style (16th Edition):

Li, Jiahui. “Verification and Validation Study of OpenFOAM on the Generic Prismatic Planing Hull Form.” 2019. Masters Thesis, Virginia Tech. Accessed January 22, 2021. http://hdl.handle.net/10919/89904.

MLA Handbook (7th Edition):

Li, Jiahui. “Verification and Validation Study of OpenFOAM on the Generic Prismatic Planing Hull Form.” 2019. Web. 22 Jan 2021.

Vancouver:

Li J. Verification and Validation Study of OpenFOAM on the Generic Prismatic Planing Hull Form. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10919/89904.

Council of Science Editors:

Li J. Verification and Validation Study of OpenFOAM on the Generic Prismatic Planing Hull Form. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/89904


Grand Valley State University

2. Crosby, Mowgli J. A CFD Study on the Performance of High Speed Planing Hulls.

Degree: 2019, Grand Valley State University

Most high speed water craft are able to achieve high speeds through the use of a planing hull. Planing hulls use hydrodynamic forces to lift a portion of the vessel out of the water, reducing drag, and allowing for greater speeds. Determining the flow around such vessels is traditionally achieved using a scale model in a tow tank. The purpose of this study was to analyze the performance of a high speed planing hull determine the effects of several geometric features using computational fluid dynamics rather than traditional experimentation. The goal was to determine the best configuration to ensure the lowest resistance on the hull at high speed. This was achieved using STAR CCM+ to solve a three dimensional computational analysis for the multiphase flow and dynamic motion of a planing hull. An initial simulation was created for a 25 ft base hull and validated using experimental data from a towing tank. After developing an accurate simulation for a single hull, the hull geometry was modified to test for the effects of the keel line geometry, deadrise angle, and spray rail location. A full factorial DOE analysis was performed to examine the effects of the tested geometric features and the interactions between them. The results from this analysis showed that the tested features had a significant effect on the performance of the hull. Increasing the deadrise angle resulted in a decrease in sinkage, an increase in trim angle, and an increase in the total drag on the hull. Raising the keel line height caused a decrease in trim angle and sinkage, while increasing the total drag. These two terms had a significant interaction. As one increased, the relative effect of changing the other also increased for total drag. The final geometric feature tested was the spray rails. Adding spray rails to the bottom of the hull significantly increased the sinkage. Moving the location of the spray rails away from the center of the hull increased the total drag. This showed that the total drag could be significantly reduced by altering these geometric features of the hull.

Subjects/Keywords: high speed water craft; planing hull; hydrodynamics; computational fluid dynamics; Computational Engineering; Dynamics and Dynamical Systems

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Crosby, M. J. (2019). A CFD Study on the Performance of High Speed Planing Hulls. (Thesis). Grand Valley State University. Retrieved from https://scholarworks.gvsu.edu/theses/966

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):

Crosby, Mowgli J. “A CFD Study on the Performance of High Speed Planing Hulls.” 2019. Thesis, Grand Valley State University. Accessed January 22, 2021. https://scholarworks.gvsu.edu/theses/966.

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

MLA Handbook (7th Edition):

Crosby, Mowgli J. “A CFD Study on the Performance of High Speed Planing Hulls.” 2019. Web. 22 Jan 2021.

Vancouver:

Crosby MJ. A CFD Study on the Performance of High Speed Planing Hulls. [Internet] [Thesis]. Grand Valley State University; 2019. [cited 2021 Jan 22]. Available from: https://scholarworks.gvsu.edu/theses/966.

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

Council of Science Editors:

Crosby MJ. A CFD Study on the Performance of High Speed Planing Hulls. [Thesis]. Grand Valley State University; 2019. Available from: https://scholarworks.gvsu.edu/theses/966

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

3. Bay, Raymond James. Improved Design Method for Cambered Stepped Hulls with High Deadrise.

Degree: MS, Ocean Engineering, 2019, Virginia Tech

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. Advisors/Committee Members: Brizzolara, Stefano (committeechair), Paterson, Eric G. (committee member), Brown, Alan J. (committee member).

Subjects/Keywords: CFD; Planing Surface; Cambered Step Hull

…2 1.3 Cambered Step Planing Hull [4]… …x28;1.2) Planing Hull Theory The basics of planing can be understood with the simple… …3 Clement’s Dynaplane Concept The planing hull design can be modified with the addition… …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… 

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Bay, R. J. (2019). Improved Design Method for Cambered Stepped Hulls with High Deadrise. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90298

Chicago Manual of Style (16th Edition):

Bay, Raymond James. “Improved Design Method for Cambered Stepped Hulls with High Deadrise.” 2019. Masters Thesis, Virginia Tech. Accessed January 22, 2021. http://hdl.handle.net/10919/90298.

MLA Handbook (7th Edition):

Bay, Raymond James. “Improved Design Method for Cambered Stepped Hulls with High Deadrise.” 2019. Web. 22 Jan 2021.

Vancouver:

Bay RJ. Improved Design Method for Cambered Stepped Hulls with High Deadrise. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10919/90298.

Council of Science Editors:

Bay RJ. Improved Design Method for Cambered Stepped Hulls with High Deadrise. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90298

.