Lagrangian Coherent Structures for Design Analysis of Revolving Doors
Lagrangian Coherent Structures for Design Analysis of Revolving Doors
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用于旋转门设计分析的拉格朗日相干结构
DOI：
10.1109/tvcg.2012.243
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发表时间：
2012
影响因子：
5.2
通讯作者：
R. Peikert
中科院分区：
文献类型：
--
作者：
Benjamin Schindler;Raphael Fuchs;S. Barp;J. Waser;Armin Pobitzer;Robert Carnecky;K. Matkovič;R. Peikert
房间气流组织和换气是节能建筑设计的重要方面。因此，越来越多的人在施工前使用模拟来实现节能设计。我们对建筑物入口处产生的气流进行了直观分析，该入口处使用了旋转门和风幕的组合。由此产生的流动模式具有挑战性，因为有两种相互作用的流动模式：一方面，旋转门充当泵，另一方面，空气幕在建筑物内部和旋转门之间产生一层均匀运动的暖空气。拉格朗日相干结构(LCS)，其定义是流动障碍，是可视化冷暖气流分离和再循环行为的选择方法。LCS的提取基于有限时间Lyapunov指数(FTLE)，并利用了与弱LCS概念一致的脊线定义。FTLE计算和脊线提取都利用快速傅立叶变换来计算尺度空间导数，从而实现了稳健和高效的提取。
Room air flow and air exchange are important aspects for the design of energy-efficient buildings. As a result, simulations are increasingly used prior to construction to achieve an energy-efficient design. We present a visual analysis of air flow generated at building entrances, which uses a combination of revolving doors and air curtains. The resulting flow pattern is challenging because of two interacting flow patterns: On the one hand, the revolving door acts as a pump, on the other hand, the air curtain creates a layer of uniformly moving warm air between the interior of the building and the revolving door. Lagrangian coherent structures (LCS), which by definition are flow barriers, are the method of choice for visualizing the separation and recirculation behavior of warm and cold air flow. The extraction of LCS is based on the finite-time Lyapunov exponent (FTLE) and makes use of a ridge definition which is consistent with the concept of weak LCS. Both FTLE computation and ridge extraction are done in a robust and efficient way by making use of the fast Fourier transform for computing scale-space derivatives.