https://scholars.lib.ntu.edu.tw/handle/123456789/625143
標題: | Numerical Simulation of Micro-Bubbles Dispersion by Surface Waves | 作者: | Druzhinin O.A WU-TING TSAI |
關鍵字: | bubble dispersion; numerical simulation; surface water waves; turbulence modification | 公開日期: | 2022 | 卷: | 15 | 期: | 4 | 來源出版物: | Algorithms | 摘要: | This paper presents an algorithm for numerical modeling of bubble dispersion occurring in the near-surface layer of the upper ocean under the action of non-breaking two-dimensional (2D) surface waves. The algorithm is based on a Eulerian-Lagrangian approach where full, 3D Navier-Stokes equations for the carrier flow induced by a waved water surface are solved in a Eulerian frame, and the trajectories of individual bubbles are simultaneously tracked in a Lagrangian frame, taking into account the impact of the bubbles on the carrier flow. The bubbles diameters are considered in the range from 200 to 400 microns (thus, micro-bubbles), and the effects related to the bubbles deformation and dissolution in water are neglected. The algorithm allows evaluation of the instantaneous as well as statistically stationary, phase-averaged profiles of the carrier-flow turbulence, bubble concentration (void fraction) and void-fraction fluxes for different flow regimes, both with and without wind-induced surface drift. The simulations results show that bubbles are capable of enhancing the carrier-flow turbulence, as compared to the bubble-free flow, and that the vertical water velocity fluctuations are mostly augmented, and increasingly so by larger bubbles. The results also show that the bubbles dynamics are governed by buoyancy, the surrounding fluid acceleration force and the drag force whereas the impact of the lift force remains negligible. © 2022 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127784333&doi=10.3390%2fa15040110&partnerID=40&md5=83848f947f11af527b0aa5f6b4a20f56 https://scholars.lib.ntu.edu.tw/handle/123456789/625143 |
ISSN: | 19994893 | DOI: | 10.3390/a15040110 | SDG/關鍵字: | Drag; Lagrange multipliers; Navier Stokes equations; Numerical models; Surface waters; Turbulence; Void fraction; Water waves; Breakings; Bubble dispersion; Carrier flow; Flow turbulence; Microbubbles; Near-surface layers; Numerical simulation; Surface water waves; Turbulence modification; Upper ocean; Surface waves |
顯示於: | 工程科學及海洋工程學系 |
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