环境湍流作用下的烟云抬升数值模式

A NUMERICAL MODEL FOR THE PLUME RISE UNDER THE ACTION OF AMBIENT TURBULENCE

本文提出了一个在中性和稳定层结下,有风时热烟云抬升的数值模式,模式没有用Boussinesq假设和弯曲烟云假设(bent-over plume assumption),考虑了风对烟云的拖曳作用,认为环境湍流连续作用于烟云抬升的早期和后期。用哈明解法对模式进行数值求解后,对烟云内部各参数的分析表明,其变化过程是合理的,本模式的计算结果与实测烟云资料的比较分析也说明,在中性和稳定层结下,模式基本反映了烟云的运动规律。

In this paper, a numerical model is presented for predicting the buoyantplume rise with wind in the neutral and stable stratification. The Boussinesq approxima-tion and the bent-over plume assumption are not used in the model. Instead, the dragof the wind on the plume is taken into consideration and it is assumed that the ambientturbulence has notable effects upon the path even in the early and late stages of rising.Finally, the numerical results are obtained by applying a Hamming procedure. Analysisindicates that the change of parameters within the plume is reasonable. It is found thatthe results from the model are in good agreement with the observational data in neutraland stable stratification.