A digital filter based generation of inflow data for spatially developing direct numerical or large eddy simulations
A digital filter based generation of inflow data for spatially developing direct numerical or large eddy simulations
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DOI：
10.1016/s0021-9991(03)00090-1
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发表时间：
2003-04-10
影响因子：
4.1
通讯作者：
Janicka, J
中科院分区：
文献类型：
--
作者：
Klein, M;Sadiki, A;Janicka, J
与时间演化的湍流不同，空间非均匀流的直接数值或大涡模拟需要湍流入流边界条件，这使得结果受到速度分布的强烈影响而被规定。本文旨在提出一种生成人工速度数据的新方法，该方法再现一阶和二阶一点统计量以及局部给定的自相关函数。与现有的大多数方法相比，该方法简单、灵活、精度高。这在两个案例中得到了证明。首先，对雷诺数在1000-6000范围内的平面湍流射流进行了直接数值模拟。由于液体射流的主要破碎机理的重要性，其中流入的影响是明显的，所以我们使用新的程序，通过流体体积方案研究雾化与喷嘴内部流动的关系。(C)2003 Elsevier Science B.V.保留所有权利。
In contrast to time-evolving turbulence, direct numerical or large eddy simulations of spatially inhomogeneous flows require turbulent inflow boundary conditions, that make the results strongly influenced by the velocity profiles to be prescribed. This paper aims to present a new approach for generating artificial velocity data which reproduces first and second order one point statistics as well as a locally given autocorrelation function. The method appears to be simple, flexible and more accurate than most of the existing methods. This is demonstrated in two cases. First, direct numerical simulations of planar turbulent jets in the Reynolds number range from 1000 to 6000 are performed. Because of the importance of the primary breakup mechanism of a liquid jet in which inflow influences are evident, the new procedure is secondly used, to study atomization in dependence of the flow inside the nozzle by means of a Volume of Fluid scheme. (C) 2003 Elsevier Science B.V. All rights reserved.