search query: @supervisor Matusiak, Jerzy / total: 72
reference: 17 / 72
Author: | Ljungqvist, Kasper |
Title: | Shape optimisation of an integrated bulb-keel |
Formoptimering av en integrerad bulbköl | |
Publication type: | Master's thesis |
Publication year: | 2011 |
Pages: | 89 + [20] Language: eng |
Department/School: | Sovelletun mekaniikan laitos |
Main subject: | Laivanrakennusoppi (Kul-24) |
Supervisor: | Matusiak, Jerzy |
Instructor: | Larsson, Lars ; Vesting, Florian ; Orych, Michal |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
Instructions Reading digital theses in the closed network of the Aalto University Harald Herlin Learning CentreIn the closed network of Learning Centre you can read digital and digitized theses not available in the open network. The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/ You can read theses on the Learning Centre customer computers, which are available on all floors.
Logging on to the customer computers
Opening a thesis
Reading the thesis
Printing the thesis
|
Location: | P1 Ark Aalto 3944 | Archive |
Keywords: | keel bulb NSGA-II optimisation CFD RANS integrated bulb-keel |
Abstract (eng): | The objective of the thesis was to shape optimise an integrated bulb-keel using a numerical optimisation method and to validate how well the used methods suit this kind of problem. The algorithm used for the optimisation was a Non-dominated Sorting Genetic Algorithm, NSGA-II. The optimisation was limited to the bulb part of the keel and 7 design variables were used together with 4 inequality constraints. The hydrodynamic performance of the keel was evaluated using a RANS viscous solver and the objective function used in the optimisation was the ratio of drag coefficient over lift coefficient CD/CL. The numerical CFD calculations were validated with experimental wind tunnel tests, which is a crucial part when investigating new types of numerical flow problems. The CFD calculations were also verified using a Least Square Root method in order to obtain the numerical uncertainty. The comparison between the wind tunnel results and the CFD results showed that the CL/CD -ratio was predicted very similarly for the numerical and experimental tests. The optimised keel design had a CD/CL-ratio improvement of around 4% compared to the initial keel design. Finally the keels were mounted on a hull of a 40-foot yacht and tested in a velocity prediction program (VPP) in order to get a more understandable performance indicator of the keels. |
ED: | 2011-09-13 |
INSSI record number: 42756
+ add basket
INSSI