Eulerian-lagrangian simulation on microbubbles in turbulent channel flow
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Inclou dades d'ús des de 2022
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hdl:2117/329652
Tipus de documentText en actes de congrés
Data publicació2019
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Microbubble drag reduction technology has been proved by many experiments that it can reduce frictional resistance of ships significantly. The underlying physical mechanism of drag reduction needs to be studied by means of numerical simulation. In this paper, Eulerian-Lagrangian method is used to study the interaction between microbubbles and a fully developed turbulent channel flow. Turbulent flow field is solved using large eddy simulation (LES) method. The microbubble trajectories were tracked by the motion equation following Newton’s second law in Lagrangian framework. The interaction between microbubbles and liquid is fully considered in the simulation. The computational code is developed based on the open-source platform OpenFOAM. Before introducing bubbles, a fully developed single-phase turbulent channel flow is obtained at friction Reynolds number. The mean streamwise velocity, turbulent normal and shear stresses are verified by comparison with standard DNS results. Microbubbles are injected uniformly into the channel and eventually form a bubble layer on the upper plate due to buoyancy. The drag reduction of the upper plate is calculated and detailed analysis is carried out about the interaction between microbubbles and turbulent boundary layer.
CitacióZhang, X.; Wang, J.; Wan, D. Eulerian-lagrangian simulation on microbubbles in turbulent channel flow. A: MARINE VIII. "MARINE VIII : proceedings of the VIII International Conference on Computational Methods in Marine Engineering". CIMNE, 2019, p. 285-295. ISBN 978-84-949194-3-5.
ISBN978-84-949194-3-5
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