| With the rapid development of China’s economy and the accelerating process of industrialization,a large number of high temperature surplus energy and humidity will be generated in some industrial production processes,forming strong natural convection,affecting the indoor air distribution and the migration of pollutants,which is of great harm to the safety of the working environment and the health of workers.Current,using computational fluid dynamics(CFD)numerical simulation,there are more and more researches on the methods of indoor air distribution and the distribution laws of temperature and humidity,pollutants.However,when using the CFD simulation of the working condition of complex models or industrial environment,the computing speed is slow,which is particularly prominent in the practical engineering problems,such as optimizing the parameters control.Implicit Fast Fluid Dynamics(Implicit FFD)can overcome this problem and create conditions for rapid simulation of temperature,humidity and pollutant distribution in industrial environment.Based on the implicit FFD,this paper develops a fast calculation model for the simulation of pollutant migration in high temperature and humidity environment.The main research works are as follows :(1)Based on the implicit FFD,a fast calculation model of strong natural convection combined with the incompressible ideal gas model is developed.The model is verified in a case of natural convection in enclosed space which proves that the calculation of high temperature field by the model is accurate.Secondly,the distribution of indoor flow field and temperature field under different temperature conditions is simulated in the industrial factory building environment,and the calculated results are basically consistent with the experimental data,which verifies the accuracy and feasibility of the model in the industrial environment simulation.(2)Based on the implicit FFD,a fast calculation model of relative humidity is developed.The high humidity environment of industrial plant building is simulated and compared with the traditional PIMPLE algorithm.The results of the two algorithms are similar,but the implicit FFD saves 84% of the calculation time compared with PIMPLE algorithm,which greatly improves the calculation efficiency.(3)Based on the implicit FFD,combined with the gaseous pollutant transport equation,a fast calculation model for gaseous pollutants is developed.The distribution of gaseous pollutant concentration under different temperature conditions is simulated in industrial plant building environment,and the calculated results are in good agreement with the experimental data,and the error is within the acceptable range.(4)A fast calculation model for particles is proposed,which combines the drift flux model with the implicit FFD.The accuracy of the model is verified in a three-dimensional particle case.Compared with the PIMPLE algorithm,the calculation time of the implicit FFD is greatly reduced.The model is used to simulate the distribution of particles in industrial environment,and the calculated results are basically consistent with the experimental data,which verifies the applicability of the rapid calculation model for particles in real industrial environment.Based on the verification results of real cases,it shows that the implicit FFD is fast and accurate in the simulation calculation of high temperature and high humidity industrial environment and the migration law of pollutants,and has good engineering practical application value. |
