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Benchmark computations for 3D two-phase flows: A coupled lattice Boltzmann-level set study

机译:3D两相流的基准计算:耦合格子Boltzmann级集研究

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Following our previous work on the application of the diffuse interface coupled lattice Boltzmann-level set (LB-IS) approach to benchmark computations for 2D rising bubble simulations, this paper investigates the performance of the coupled scheme in 3D two-phase flows. In particular, the use of different lattice stencils, e.g., D3Q15, D3Q19 and D3Q27 is studied and the results for 3D rising bubble simulations are compared with regard to isotropy and accuracy against those obtained by finite element and finite difference solutions of the Navier-Stokes equations. It is shown that the method can eventually recover the benchmark solutions, provided that the interface region is aptly refined by the underlying lattice. Following the benchmark simulations, the application of the method in solving other numerically subtle problems, e.g., binary droplet collision and droplet splashing on wet surface under high Re and We numbers is presented. Moreover, implementations on general purpose GPUs are pursued, where the computations are adaptively refined around the critical parts of the flow. (C) 2016 Elsevier Ltd. All rights reserved.
机译:在我们先前将扩散接口耦合格子玻尔兹曼能级集(LB-IS)方法应用于2D上升气泡模拟的基准计算的工作之后,本文研究了耦合方案在3D两相流中的性能。尤其是,研究了使用不同的晶格模版(例如D3Q15,D3Q19和D3Q27),并比较了3D上升气泡模拟的结果和各向同性和精度,以及通过Navier-Stokes的有限元和有限差分解获得的结果。方程。结果表明,只要界面区域由基础晶格适当地精炼,该方法就可以最终恢复基准解决方案。根据基准模拟,提出了该方法在解决其他数值细微问题上的应用,例如在高Re和We数下二元液滴碰撞和湿表面上的液滴飞溅。而且,追求在通用GPU上的实现,其中围绕流的关键部分自适应地改进计算。 (C)2016 Elsevier Ltd.保留所有权利。

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