Abstract: 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.

Key words: chemicalhazard, diffusionprediction, OpenFOAM, softwaredevelopment, experimentalsimulation