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Date of Publication:2022-10-10

Journal:Chuan Bo Li Xue/Journal of Ship Mechanics

Volume:24

Issue:8

Page Number:989-996

ISSN No.:1007-7294

Abstract:A numerical model was established to perform simulation for micro-bubble drag reduction of a twodimensional plate based on twoPhaseEulerFoam solver in OpenFOAM, which, taking into account the influence of forces between two phases, solved two-phase Navier-Stokes equation directly with the standard k-Ε turbulence model and simulated the bubble break-up and coalescence by solving interface area transport equation. The numerical results were compared with the experimental findings of Madavan to verify the feasibility of this model. The influence of bubble diameter, air flow rate and buoyancy on drag reduction efficiency with different flow velocities was analyzed and the influence of bubbles on fluid velocity distribution and gas volume fraction near the boundary was studied. It is shown that a higher efficiency of drag reduction will result from a higher air flow rate and bubbles with smaller diameters, and that buoyancy does have some effects on drag reduction. © 2020, Editorial Board of Journal of Ship Mechanics. All right reserved.

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