Inlet conditions for LES using mapping and feedback control
Inlet conditions for LES using mapping and feedback control
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DOI：
10.1016/j.compfluid.2009.02.001
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发表时间：
2009-06-01
影响因子：
2.8
通讯作者：
Tabor, G.
中科院分区：
文献类型：
--
作者：
Baba-Ahmadi, M. H.;Tabor, G.
为大涡模拟（LES）生成有效的进口边界条件是一个具有挑战性的问题.实现这一点的最准确方法是在模拟之前或与模拟同时运行前兆计算以生成湍流库，并将数据从库模拟传输到主域入口。在本文中，我们调查的一个变体，其中前兆计算被归入主域，其功能被通过从指定平面下游的入口回到入口的数据的映射。在主区域的入口段内，流量可能受到许多计算操作的影响，包括引入人工体积力、修改映射数据和直接校正速度数据。这些修改可以链接到反馈控制算法，以驱动解决方案朝向指定的特性，包括平均和湍流轮廓，以及诸如涡流的流动的整体特性。各种变体的基本技术，将不同程度的复杂性的控制实施和测试模拟流在一个矩形通道和一个圆形管道。(C)2009爱思唯尔有限公司保留所有权利。
Generating effective and efficient inlet boundary conditions for large eddy simulation (LES) is a challenging problem. The most accurate way of achieving this is to run a precursor calculation to generate a library of turbulence, either prior to the simulation or concurrently with it, and to transfer the data from the library simulation to the main domain inlet. In this paper, we investigate a variant of this, in which the precursor calculation is subsumed into the main domain, its function being adopted by a mapping of data from a specified plane downstream of the inlet back to the inlet. Within this inlet section of the main domain, the flow can be affected by a number of computational manipulations, including the introduction of artificial body forces, modification of the mapped data, and direct correction of the velocity data. These modifications can be linked to feedback control algorithms to drive the solution towards specified characteristics, including mean and turbulent flow profiles, and bulk properties of the flow such as swirl. Various variants of the basic technique incorporating different levels of complexity in the control are implemented and tested on simulation of flow in a rectangular channel and in a circular pipe. (C) 2009 Elsevier Ltd. All rights reserved.