基于OpenFOAM的城市街区毒气扩散模拟  

Simulation of Toxic Gas Diffusion in Complex Urban Blocks Based on OpenFOAM

作　　者：陈存杨 朱勇兵[2] 陈崇成[1] 王巍[2] 巫建伟[1] 

机构地区：[1]福州大学福建省空间信息工程研究中心福建省空间数据挖掘与信息共享教育部重点实验室,福建福州350002 [2]解放军防化研究院,北京102205

出　　处：《环境科学研究》2015年第5期697-703,共7页Research of Environmental Sciences

基　　金：国家科技支撑计划项目(2013BAH28F00);福建省科技计划项目(2010I0008;2010HZ0004-1);装备预演项目(40407020602)

摘　　要：为了对毒气扩散过程进行及时、有效的模拟,将开源计算流体动力学软件Open FOAM与PISO算法(pressure implicit with splitting of operators,压力隐式算子分割算法)相结合,进行城市街区毒气扩散模拟研究.将SIMPLE(semi-implicit method for pressure linked equations,压力耦合方程组的半隐式算法)与PISO算法进行了对比,指出以PISO算法为基础的数值模拟在城市街区这类大范围毒气扩散模拟中具有容差性强、计算较为稳定等优点.以福州大学怡山校区为扩散区虚拟地理环境,选用氯气为假定毒气,利用Open FOAM对氯气的扩散传播过程进行了模拟,并与商用软件FLUENT在相同条件下的ρ(Cl2)模拟结果进行了对比.结果表明,结合PISO算法的Open FOAM能够较好地完成复杂虚拟地理环境下的毒气扩散过程模拟,其ρ(Cl2)模拟结果与FLUENT模拟结果的平均偏差小于5%,但在计算效率上却提高了41.89%.In order to simulate the diffusion of toxic gas in a timely and effective way, based on the PISO （ pressure implicit with splitting of operators） algorithm, the simulation of gas diffusion in urban areas with OpenFOAM software was carried out. A comparison was conducted between the SIMPLE （semi-implicit method for pressure linked equations） algorithm and PISO algorithm. The PISO algorithm has priority in terms of tolerance and stability for simulation of wide-range gas diffusion in urban areas with neighboring diffusion zones. With OpenFOAM software, the diffusion and spreading process of chlorine in Yishan Campus of Fuzhou University was simulated. The simulated results by FLUEN software were then compared under the same conditions. The results showed that OpenFOAM could simulate the diffusion process of poisonous gas under the complicated virtual geographical environment. The mean deviation of the simulated result by OpenFOAM was 5% less than that by the FLUENT; however, the computational efficiency was improved by 41.89%.

关 键 词：毒气扩散 计算流体动力学 开源软件OpenFOAM 压力隐式算子分割算法 

分 类 号：X51[环境科学与工程—环境工程]