Research Into Application Of Numerical Wind Tunnel Technology Based On Reynolds-averaged Navier-stokes Simulation

Numerical wind tunnel technology is just emerging in field of structural wind engineering, it has the key attributes of the real wind tunnel test. Compared with the field measurement and the real wind tunnel test, it can calculate in full structure size and high Reynolds number, and on some issues the research can be ideal, convenient to do a parametric analysis. It can also provide abundant data, and is low cost, short cycle,saving human resources, material resources, and financial resources. In recent years,Many experts researched into the problems in structural wind engineering field by numerical wind tunnel technology, and achieved fruitful results. But, there are still many problems in the numerical wind tunnel technology because of the complexity of turbulent flow, it still need further study in theory and practical application. The main research contents and conclusion in this paper are as follows:Firstly, introduced the basic equations of flowing fluid, on this base, described the several turbulent models used in turbulent flow, the discrete methods in space and time field of the equations, processing methods of the source term and near the wall,providing adequate theoretical basis for further numerical simulation.Did a unsteady numerical simulation of flow around a square cylinder using different turbulence models in the Reynolds-Averaged Navier-Stokes simulation. It is found that, the Reynolds stress model(RSM) shows better in time history vibration and time average value of the parameters, vortex shedding. RNG k-? and Realizable k-?turbulence model show a little poorer in time history vibration of the parameters, vortexshedding, but is equivalent in time average value of the parameters with RSM turbulence model. Standard k-? turbulence model can't get the time history vibration of the parameters and vortex shedding, and is poor in time average value of the parameters.Analysed the flow field characteristics of flow around a square cylinder and a circular cylinder using RSM turbulence model to research into the distribution of lift coefficient,drag coefficient, Strouhal number, vortex shedding. The results shows that, in the flow around a circular cylinder, there is drag crisis phenomenon in a certain Reynolds number, but not in the flow around a square cylinder. But there is a certain gap in the range of Reynolds number between the numerical simulation in this paper and related documents when the drag crisis phenomenon happens.Analysed the distribution of flow field around the The Chinese National Grand Theater using the steady RNG k-? turbulence model in the Reynolds-Averaged Navier-Stokes simulation. The result shows that, the surface of the National Grand Theater is mainly affected by vertical suction, it is positive pressure zone in the windward of the National Grand Theater, and is negative pressure zone in the top and the side. In the leeward side, the distribution of the pressure is confused because of the vortex, and is little in the value. when under different wind angles, the pressure follows certain rules. The Great Hall of the people has a great influence on the pressure distribution of the National Grand Theater, especially on the up-wind of the National Grand Theater. This time, the National Grand Theater is located in the vortex shedding area behind the Great Hall of the people, the surface pressure of the National Grand Theater is confused, and low because of the shielding effect. Compared with the real wind tunnel test, the data of the numerical simulation are in good agreement with it, so the numerical wind tunnel can provide the basis for wind engineering design with the real wind tunnel test.