水中化学羽流的建模和数值模拟分析

Modeling and Numerical Simulation Analysis of Chemical Plumes Underwater

建立了一种新的基于计算流体力学的离散化学羽流模型。该模型使用CFD方法比较精确地计算化学羽流所处的湍流环境,而化学羽流中所含的物质则作为离散相进行建模。利用所建模型对水中的化学羽流进行数值模拟分析,得到了化学羽流的基本特征:化学羽流整体的输运形态曲折蜿蜒;羽流某点的瞬时浓度随时间不断的变化,变化幅度较大且不规则;一段时间内截面的平均浓度分布具有高斯分布的特征。所得结果与实验研究结果一致,验证了模型的合理性,克服了现有模型过于简化而与实际结果一致性差的不足,为羽流追踪探测的研究提供了基础。

A new discrete chemical plume model based on CFD is established. The model uses CFD to calculate the turbulent environment of chemical plumes, and the chemical substances contained in the plume are modeled as a discrete phase. The basic characteristics of chemical plumes are obtained through the simulation calculation with the model：（1）the transport shape of chemical plumes is meandering;（2）instantaneous concentration of plumes at one point changes with time and the variation amplitude is large and irregular;（3）in a period of time the average con-centration distribution of the cross section is Gaussian distribution. The results are consistent with the experimental results, verifying the rationality of the model, overcoming the shortcomings of the current models which are too sim-plified and poorly consistent with actual results, and providing the basis for the study of plume tracing.