面源模式数值模拟计算分析

系统地介绍了面源模式计算方法.为了提高面源模式计算的准确性,提出了面源反扩散参数的概念.采用数值模拟计算的方法,对面源模式做了实际计算,并将其计算结果与虚点源后置法做了分析和比较.给出了采用虚点源后置法对面源内部和近源处计算结果的修正方法.并对虚点源后置法横风方向计算结果进行了修正.在计算过程中,令面源(y方向)内部所有计算点的浓度与中心点浓度相同,在面源两边0.45 L范围以外取实际浓度值.

CALCULATION AND ANALYSIS OF NUMERICAL SIMULATION FOR THE AREA SOURCES MODEL

It has become a more and more urgent task to develop a better method for calculating the area source model with the increase of the atmosphere pollution as a result of human beings' activities. To meet this urgent need, the present paper thinks it necessary to introduce the concept of contrary diffusion parameters for a given area sources of the atmosphere pollutants. To achieve the purpose, we have developed a calculation method of numerical simulation and the ways on how to use the method to simulate a model of the area source properly. The calculation results we have gained have been compared and analyzed carefully with those gained by using the method proves to be valuable and in conformity with the set of the virtual point source now commonly used in the atmospheric environment field of our country. In addition, the paper has also given a detailed account of the practical use both for the analysis of the inside and the adjacent outside factors resulting in the atmospheric pollution elements as a result of detailed analysis of the wind direction change. And finally, with the above model used for calculating the actual influence caused by the pollutants, it is concluded that the concentration of all the calculated points in the inside of the area source may be equal to the concentration at the central point of the area, which would be still realistic to be used even if it can be beyond the range of 0.45 L at the two sides of the area source.