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arXiv 1608.01906physics.flu-dyn
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二元流体流动的有限元格子玻尔兹曼方法评价

Evaluation of the Finite Element Lattice Boltzmann Method for Binary Fluid Flows

Rastin Matin, Marek Krzysztof Misztal, Anier Hernandez-Garcia, Joachim Mathiesen

摘要:

与常用的格子玻尔兹曼方法相比,非格子玻尔兹曼方法将速度离散化与底层空间网格解耦,从而允许复杂边界的更有效的几何表示。目前的工作结合了基于特征的整合的流步骤与自由能为基础的多相模型由李等。[Journal of计算物理,206(1),2005 ]。这允许模拟时间步长大于弛豫时间的数量级。不像以前的工作Wardle et.等人[Computers and Mathematics with Applications,65(2),2013 ],其将分子间强迫项集成在平流项中,当前方案局部地应用碰撞和强迫项以用于更简单的有限元公式。一系列彻底的基准研究表明,这并不影响稳定性,该计划能够准确地模拟在大密度和粘度对比的流动。

英文摘要:

In contrast to the commonly used lattice Boltzmann method, off-lattice Boltzmann methods decouple the velocity discretization from the underlying spatial grid, thus allowing for more efficient geometric representations of complex boundaries. The current work combines characteristic-based integration of the streaming step with the free-energy based multiphase model by Lee et. al. [Journal of Computational Physics, 206 (1), 2005 ]. This allows for simulation time steps more than an order of magnitude larger than the relaxation time. Unlike previous work by Wardle et. al. [Computers and Mathematics with Applications, 65 (2), 2013 ] that integrated intermolecular forcing terms in the advection term, the current scheme applies collision and forcing terms locally for a simpler finite element formulation. A series of thorough benchmark studies reveal that this does not compromise stability and that the scheme is able to accurately simulate flows at large density and viscosity contrasts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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