平衡大气边界层的数值模拟和风洞实验

Numerical and Experimental Studies on Selfsustaining Equilibrium Atmosphere Boundary Layer

摘要:

通过了风洞实验和计算流体动力学(CFD)模拟的对比,结果显示CFD模拟风特性剖面与实验结果吻合情况符合工程应用的精度要求，说明CFD模拟的有效性和准确性.在进行与风洞试验对比的数值模拟时，研究了壁面Y+值对模拟结果的影响，说明了数值模拟的准确性需要精细的壁面网格的支持.另外，通过CFD数值模拟无限长风洞构造满足水平均匀性要求的大气边界层流场，模拟结果显示模拟满足水平均匀性要求的大气边界层风剖面与计算风工程中通常使用的风剖面有一定的差异，因此针对此问题需要进一步的研究.

Abstract:

In this study, computational fluid dynamics(CFD) simulation is compared with results from the wind tunnel test. The good agreement of wind profile between simulation and wind tunnel test confirms the validation and precision of the CFD simulation.A comparative study is made of the impact of Y+ on the simulation results between CFD simulation and wind tunnel test.The study reveals that validation of CFD simulation relies on fine grid system near the wall.A numerical experiment which modeled an infinitely long wind tunnel is conducted using CFD and the profile of a selfsustaining equilibrium atmosphere boundary layer is obtained.The result shows the simulated wind profile differs from those commonly used in computational wind engineering. Thus, a further study is necessary to analyze the nature of the difference.