A master thesis from Aalborg University
Numerical CFD study on the frictional drag reduction using air lubrication
Author(s)
Term
4. term
Education
Publication year
2022
Submitted on
2022-05-30
Pages
73 pages
Abstract
In this study a series of multi-phase Large Eddy Simulations with the Volume Of Fluid approach are made to analyse the use of air lubrication to reduce the drag on a ship by injecting air bubbles underneath the hull. The multi-phase simulations are initialised with a turbulent velocity profile obtained from simulations with a single-phase computational model, which is validated against theory, by comparing the turbulent boundary layer with the law of the wall. In the multi-phase simulations, the air volume fraction is varied from 14 - 50%. In the case with an air volume fraction of 14% a reduction in wall shear stress of 20 - 40% is seen. In the other cases with an air volume fraction from 27 - 50% a reduction of 40 - 60% in the wall shear stress is seen compared to the values using the single-phase model.
Keywords
LES ; VOF ; CFD ; Air lubrication
Documents
Colophon: This page is part of the AAU Student Projects portal, which is run by Aalborg University. Here, you can find and download publicly available bachelor's theses and master's projects from across the university dating from 2008 onwards. Student projects from before 2008 are available in printed form at Aalborg University Library.
If you have any questions about AAU Student Projects or the research registration, dissemination and analysis at Aalborg University, please feel free to contact the VBN team. You can also find more information in the AAU Student Projects FAQs.