Unsteady computational fluid dynamics simulations of six degrees-of-freedom submarine manoeuvres

dc.contributor.advisorGerber, Andrew
dc.contributor.advisorWatt, George
dc.contributor.authorBettle, Mark
dc.date.accessioned2023-03-01T16:22:15Z
dc.date.available2023-03-01T16:22:15Z
dc.date.issued2012
dc.date.updated2023-03-01T15:01:54Z
dc.description.abstractSubmarine hydrodynamicists are continually striving to improve submarine manoeuvring predictions in order to better understand operational limitations. Traditional manoeuvring simulations use semi-empirical force estimation methods or captive model experiments to predict hydrodynamic forces and moments on the manoeuvring submarine. Semi-empirical methods are inexpensive and fast but not consistently accurate. Coefficient-based models derived from captive model experiments are more accurate but much more expensive. Time-history effects are also difficult to incorporate in coefficient-based modelling and are thus often neglected. The effect of the seabed and other passing vessels are also not included in traditional models. In order to address these issues, an unsteady, six degrees-of-freedom (DOF), Reynolds Averaged Navier-Stokes (RANS) submarine simulation approach has been developed and applied to simulating the emergency rising manoeuvre and the interaction between a submarine and a passing tanker. In this method, the 6 DOF motion of the full-scale submarine is integrated simultaneously with the RANS solution for fluid forces. Coefficient-based modelling is used for the propeller, control-surface deflections, and ballast blowing in order to achieve economical solutions while accounting for the important viscous effects. The submarine motion is integrated implicitly using a robust predictor-corrector approach that uses a novel application of semiempirical and coefficient-based models to accelerate convergence at each timestep. A combination of sliding interfaces and mesh deformation is used to account for the relative motion between the tanker and submarine. Simulation results reproduce the roll-instability observed for buoyantly rising submarines and provide insight on the magnitude of the disturbance forces and submarine motions induced by a large tanker passing over a diesel-electric submarine.
dc.description.copyright© Mark Bettle, 2013
dc.formattext/xml
dc.format.extentxix, 211 pages
dc.format.mediumelectronic
dc.identifier.urihttps://unbscholar.lib.unb.ca/handle/1882/13666
dc.language.isoen_CA
dc.publisherUniversity of New Brunswick
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.subject.disciplineMechanical Engineering
dc.titleUnsteady computational fluid dynamics simulations of six degrees-of-freedom submarine manoeuvres
dc.typemaster thesis
thesis.degree.disciplineMechanical Engineering
thesis.degree.fullnameDoctor of Philosophy
thesis.degree.grantorUniversity of New Brunswick
thesis.degree.levelmasters
thesis.degree.namePh.D.

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
item.pdf
Size:
36.62 MB
Format:
Adobe Portable Document Format