建筑数值风洞的基础研究

数值风洞模拟要想获得理想的计算精度,依赖计算人员的理论基础及其在具体操作中对各种重要因素的选择.针对这个问题,本文采用一个CUBE建筑模型的风洞试验的试验结果作为比较标准,比较了各种不同条件下的建筑数值风洞模拟结果和试验结果,着重分析了网格划分、计算区域、湍流模型和对流项的差分格式等因素对建筑数值风洞数值模拟结果的影响.模拟结果表明:在各种影响因素中,计算区域的影响相对较小,而网格划分、湍流模型的影响相对较大.最后给出如何对上述各种因素作出合理选择的建议.

Fundamental Research of the Architectural Numerical Wind Tunnel

The theoretical foundation of the user and the selection of some factors determine the calculation accuracy in the simulation of the architectural numerical wind tunnel.To this question,the calculated results of some computational fluid dynamics(CFD) numerical simulation in different conditions were compared with the wind tunnel experimental results from one cubic building model,and the influences of different factors on the simulation results with the architectural numerical wind tunnel were analyzed.It was demonstrated that the effects of computational domain were relatively minor,but the effects of grid arrangement,turbulence model were relatively major.Finally,some proposals were put forward on how to select the relevant factors in the process of using the architectural numerical wind tunnel.