基于OpenFOAM的化学危害扩散预测求解器的开发与验证

Development and Verification of Chemical Hazard Diffusion Prediction Solver Based on OpenFOAM

化学危害扩散预测是精确化防护保障的关键基础,解决化学危害扩散预测的关键是如何精确表达下垫面、建筑物、湍流对危害物的扩散影响机理。立足化学危害扩散预测实际需求,在计算流体力学软件OpenFOAM中创新性植入信息融合模块、数据同化模块、源项反演模块和智能寻优算法,设计开发适用于化学危害扩散预测的求解器ChdpFOAM,并对ChdpFOAM求解器的适用性进行实验分析。研究结果表明:ChdpFOAM求解器在下垫面相对平坦、建筑物少的区域预测精度较高,在建筑物密集区域预测精度有所下降;相对于PISOFOAM求解器,ChdpFOAM求解器的计算精度约提升6%,计算效率下降约32.57%,具备良好的可移植性和拓展性,为化学危害扩散预测提供了一种新思路与方法。

The diffusion prediction of chemical hazards is the key foundation of accurate chemical defense support.The key to the diffusion prediction of chemical hazards is how to accurately express the influence mechanisms of underlying surface,buildings and turbulence on the diffusion of chemical hazards.Based on the actual needs of the diffusion prediction,the information fusion module,data assimilation module,source term inversion module and intelligent optimization algorithm are innovatively implanted into OpenFOAM,and a ChdpFOAM solver is designed and developed for the diffusion prediction of chemical hazards.Through the experimental analysis of ChdpFOAM solver,it is found that the solver has higher prediction accuracy in the area with relatively flat underlying surface and few buildings,and the prediction accuracy decreases in the area with dense buildings.Compared with PISOFOAM solver,the calculation accuracy of ChdpFOAM solver is improved by about 6%,and the calculation efficiency is reduced by about 32.57%.ChdpFOAM solver has good portability and expansibility.