3D full coupling model for strong interaction between a pulsating bubble and a movable sphere

JOURNAL OF COMPUTATIONAL PHYSICS

卷:392

Article

Li, Shuai¹  Zhang, A-Man¹  Han, Rui¹  Ma, Qingwei² 

[1] Harbin Engn Univ, Coll Shipbldg Engn, 145 Nantong St, Harbin 150001, Heilongjiang, Peoples R China

[2] City Univ London, Sch Math Comp Sci & Engn, London, England

关键词: Bubble dynamics;    Sphere;    Full coupling model;    Boundary integral method;   

DOI  :  10.1016/j.jcp.2019.05.001

来源: Elsevier

【 摘 要 】

In this study, we establish a full coupling model (FCM) to simulate strong bubble-sphere interactions based on a three-dimensional boundary integral method. Different from the conventional loose coupling model (LCM), FCM adopts several auxiliary functions to deal with the mutual dependence between the hydrodynamic force and the sphere acceleration. In addition, the weighted moving least square method, a mesh density control scheme and an adaptive mesh refinement scheme are implemented to improve the quality of mesh on the deformable bubble surface. To validate the present model, convergence tests on different mesh sizes and time steps are conducted at first. The numerical results are also compared with the axisymmetric model, in which consistent results have been achieved. We further make comparisons between the numerical results and those from several experiments under different boundary conditions. For weak interaction cases, both LCM and FCM can give the results that have good agreement with the experiment data. As the interaction effects become stronger, the advantage of the FCM over the LCM becomes increasingly obvious. Particularly, when the pulsating bubble is in contact with the sphere surface, the essential physical features of the experiments can be well reproduced by the FCM while the predictions by the LCM are significantly different from the experiment. The present 3D model can be further extended to study more complex underwater contact explosions, cavitation inception on a structure and airgun bubble dynamics. (C) 2019 Elsevier Inc. All rights reserved.

【 授权许可】

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