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arXiv 0802.3706physics.flu-dynphysics.comp-ph
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描述完全可压缩理想气体湍流的一种新的拉格朗日粒子方法

A new lagrangian particle method to describe turbulent flows of fully compressible ideal gases

B. Ivancic

摘要:

有几种方法来描述含有颗粒的流动,例如格子气自动机(LGA),格子玻尔兹曼方法(LBM)或光滑粒子流体动力学(SPH)。这些方法不使用固定网格,在固定网格上通过例如有限体积法求解纳维-斯托克斯方程。使用大量粒子或粒子密度分布来模拟流动,这些粒子或粒子密度分布相互作用,并且由于统计定律和比纳维-斯托克斯方程更基本的方法,可以导出平均流动变量。在简要总结了最流行的粒子方法之后,将介绍新的DMPC(耗散多粒子碰撞)方法。DMPC模型消除了已建立的粒子方法的一些弱点,并显示出更准确的计算流体动力学解决方案的高潜力,特别是在标准计算流体动力学工具仍然存在问题的领域(例如,气动声学)。DMPC模型处理离散的圆形颗粒,并计算多个重叠颗粒的详细碰撞过程(微观尺度)。利用热力学、统计学和相似定律,可以导出全局(大尺度)流动变量。该模型是二维的,粒子可以根据作用在其上的力在二维平面内的每个方向上移动。相邻粒子之间可能的重叠和多粒子相互作用是该模型的重要特征。一个免费软件在www.cfd2k.eu下开发和发布。在那里可以下载可执行文件、用户指南和几个示例性案例。

英文摘要:

There are several approaches to describe flows with particles e.g. Lattice-Gas Automata (LGA), Lattice-Boltzmann method (LBM) or smoothed particle hydrodynamics (SPH). These approaches do not use fixed grids on which the Navier-Stokes equations are solved via e.g. finite volume method. The flow is simulated using a multitude of particles or particle density distributions, which interacts and due to statistical laws and an even more fundamental approach than the Navier-Stokes equation, the averaged flow variables can be derived. After a short summary of the most popular particle methods the new DMPC (Dissipative Multiple Particles Collision) approach will be presented. The DMPC-model eliminates some of the weak points of the established particle methods and shows high potential for more accurate CFD solution especially in areas where standard CFD tools still have problems (e.g. aero-acoustics). The DMPC-model deals with discrete circular particles and calculates the detailed collision process (micro scale) of several overlapping particles. With thermodynamic, statistical and similarity laws global (large scale) flow variables can be derived. The model is so far 2d and the particles can move in every direction in the 2d plane depending on the forces acting on it. The possible overlap between neighbouring particles and multi-particle interactions are important features of this model. A freeware software is developed and published under www.cfd2k.eu. There the executable, the user guide and several exemplary cases can be downloaded.

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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