流体机械

2020, v.48;No.577(07) 77-83

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基于粗网格CFD模拟方法的室内空气污染物实时寻源反计算研究
Inverse Modeling of Indoor Airborne Contaminant Source Location Application of Coarse-grid Computational Fluid Dynamics

范雪妮;王海东;胡毅冰;
Fan Xueni;Wang Haidong;Hu Yibing;School of Environment & Architecture,University of Shanghai for Science & Technology;

摘要(Abstract):

室内空气污染泄漏等事件中,及时定位污染源所在的位置,对于消除污染的影响将产生极大的帮助,联合概率法结合CFD模拟获得的气流组织数据在污染物寻源反计算中被广泛应用。对非稳态气流问题进行污染物寻源反计算时,为准确定位污染源的位置,通常采用CFD网格无关解获得流场数据,但计算周期长,无法实时寻源定位。本文以典型的办公室为例,利用不同网格数量获得的气流场进行寻源反计算,发现粗网格模型可以精确定位污染源位置,其速度场也与CFD网格无关解的十分相似,表明粗网格在非稳态气流场中可以准确定位污染源的位置,同时相较于网格无关解提升了70%以上的时间,提高了定位的速度,可以实时寻源定位,为后续救援赢得宝贵的时间。
The timely identification of indoor contaminant source location by the joint probability method along with CFD simulation is widely used the events of indoor air contaminant source leakage.This will extremely help eliminate the influence of contaminants.The air flow distribution data obtained by the joint probability method in combination with CFD simulation are widely applied in the inverse modeling for location of contaminant source.When conducting inverse modeling for the location of the contaminant source for unsteady air flow problem,in order to accurately locate the source of pollution,the flow field data usually obtained by grid-independent CFD result are used,but the computation period is too long,which prevents application of its real-time simulation.By taking a typical office as an example and using the air flow field obtained by number of different grids for inverse modeling,it was found that coarse-grid model can accurately locate the contaminant source,and its velocity field is very similar to CFD grid-independent solution,showing that the coarse-grid model can accurately locate the source of pollution in unsteady air flow field,and reduced more than 70% time compared to grid-independent solution,thus increased the speed of locating and can realize the location of the pollution source in real time,which wins precious time for subsequent rescue.

关键词(KeyWords): CFD模拟;反计算;联合概率法;粗网格
CFD simulation;inverse modeling;joint probability method;coarse-grid

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基金项目(Foundation): 国家自然科学基金项目(51508326);; 上海浦江人才计划项目(15PJ1406300)

作者(Author): 范雪妮;王海东;胡毅冰;
Fan Xueni;Wang Haidong;Hu Yibing;School of Environment & Architecture,University of Shanghai for Science & Technology;

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