灾害气体在风网中传播的时间-事件混合步长法

发布时间：2018-01-01 10:30

本文关键词：灾害气体在风网中传播的时间-事件混合步长法　出处：《辽宁工程技术大学学报(自然科学版)》2016年01期 　论文类型：期刊论文

【摘要】：为仿真描述有源风网上外源气体涌入运移过程,创新引入事件步长法,把风网中外源气体组分运动到达某一节点作为一个事件,同时取同期其他分支事件所经历的最短时间作为下一个时间步长,考察记录网络分支中外源气体到达的位置.为减小截断误差,对过大的事件时间步长作出限定,形成所谓"时间-事件混合步长"法.使每个迭代时间步长都能至少有外源气体到达某一个节点,采用节点分支汇流法计算节点浓度,使网络节点上气体浓度得到及时更新.结合矿井瓦斯突出流在网络中的扩散给出了算例,展示了不同时刻瓦斯达到网络各个节点的过程.研究结果表明:新方法能够自动截取网络中组分气体流动的微小事件变化,防止因过大的时间步长导致的截断误差;与单纯的时间步长法相比,计算精度高,模拟仿真更准确.
[Abstract]:In order to simulate the migration process of exogenous gas in active wind network, the event step method is introduced to control the movement of the components of the air source gas to a certain node as an event. At the same time, the shortest time of other branch events in the same period is taken as the next time step to investigate and record the location of the arrival of the external gas in the branch of the network in order to reduce the truncation error. The so-called "time-event hybrid step" method is formed by limiting the excessive event time step, which enables at least a foreign gas to reach a certain node in each iteration time step. The node concentration is calculated by the node branch confluence method, and the gas concentration on the network node is updated in time. An example is given based on the diffusion of mine gas outburst in the network. The process of gas reaching each node of the network at different times is shown. The results show that the new method can automatically intercept the small event change of the gas flow in the network. To prevent truncation error caused by excessive time step; Compared with the simple time step method, the calculation accuracy is higher and the simulation is more accurate.
【作者单位】：辽宁工程技术大学安全科学与工程学院;矿山热动力灾害与防治教育部重点实验室;
【基金】：国家自然科学基金项目(51174109,51074086)
【分类号】：TD725
【正文快照】： 0引言根据有源风网理论,矿井瓦斯涌出和火灾烟气均可用网域中的风源表达[1],作为网域中外来风源,源气体组分流动与弥散是非稳定的[2-4].主要采用时间步长法求解[4-5],时间步长法是脱离事件本身的一种等时间离散方法,为更细节地描述网域中灾害气体组分运移过程,消除或减少时间

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