Numerical CFD study on the frictional drag reduction using air lubrication
Author
Term
4. term
Education
Publication year
2022
Submitted on
2022-05-30
Pages
73
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
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