The Study Of Non-uniform Physical Field For The Downstream Of Hydropower Station By WRF And CFD

A large number of hydropower stations with high water head and large discharge flow in China make the problem of flood discharge atomization of hydropower stations become a hot spot of research.At present,there are three kinds of research methods for the atomization of hydropower stations.The first is the prototype observation and research method,the second one is the theoretical analysis method,and the third one is the numerical simulation research method.The characteristics of the inhomogeneous physical field in the lower reaches of the hydropower station are a key factor affecting the atomization of flood discharge.Using the mesoscale WRF model and the CFD module,the numerical simulation of the non-uniform physical field in the lower reaches of the hydropower station is carried out.The main contents of the paper are as follows:1.A high resolution mesoscale dynamic numerical model for complex mountainous terrain area is studied by the finite area numerical model WRF,Research shows that:for regional simulation in wind speed,the optimal scheme for physical process for Spring season used is MYJ boundary conditions and Ruc land surface processes;for summer is YSU boundary conditions and Ruc land surface process,for Autumn is MYJ boundary pleim-xiu conditions and land surface process and for winter is YSU boundary conditions and Ruc land surface process.2.In this paper,the coupling model of mesoscale dynamic numerical model and small scale numerical model is applied to simulate the spatial and temporal distribution of the wind field.The results show that the small scale simulation of LES has higher horizontal resolution,higher precision and more ability to reflect the influence of topography on wind field than the mesoscale simulation results.3.Conducting dynamic downscaling numerical simulation for the vicinity of the Ertan Hydropower area by The WRF-LES multi-scale coupling model,and the data of the non-uniform physical fields such as hourly mean wind speed,temperature and pressure are visualized and analyzed.The results show that the finer degree of horizontal resolution 11m×11m is more high,and the detailed description of wind field is more obvious.With the increase of height,the wind speed is continuously weakened by topographic forcing.When the height reaches 500m,the forcing effect of valley terrain can be ignored.4.Application of CATIA to the downstream area of ertan hydropower station is a complex terrain 3 d model is set up,and then using CFD method for ertan hydropower station when the working condition of a flood of water tongue wind field is numerical simulation research,obtained the ertan hydropower station water flood situation wind field distribution of the tongue.