箔条云团的布朗运动扩散模型

假定箔条所在位置处大气运动速度是一个维纳随机过程,同时在忽略箔条的质量时箔条的运动完全反应当地大气的运动,在此基础上建立箔条云团的扩散模型及数值仿真模型. 对扩散模型进行分析得到了箔条云团扩散过程中的数字特征.对数值仿真模型的分析表明必须对大气的运动方差进行时间离散化补偿,进行离散化补偿后箔条云团的数字特征不受模拟时时间步长的影响.模拟结果证明了分析的正确性.

Brown Motion Diffusion Model for Chaff Clouds

The diffusion model and numerical simulation model for chaff clouds are modeled on the assumption that the speed of air where chaff locates is a Winner random process and the mass of chaff is zero so it can trace the atmosphere speed very well. For the diffusion model and numerical simulation model, the numerical character of chaff clouds during diffusion is obtained. Comparing numerical character of above two models, it shows that the variance of atmosphere motion must be modified so the time step used in numeric simulation has no effect on numerical character of chaff clouds. The numerical simulation result agreed with this analysis.