数值风洞仿真与开阔路面仿真的关联性研究

为研究计算域对气动阻力的影响,根据实车风洞的结构参数搭建了数值风洞模型,并以开源模型DrivAer为研究对象,开展了12种车辆形态的数值风洞仿真与开阔路面仿真的对比分析。结果表明:光滑车底时,两种仿真得到的阻力值相差较小,为6~12个点(counts);详细车底时,两种仿真得到的阻力值相差较大,为17~22个点(counts)。两种仿真得到的两种车辆形态之间气动阻力的变化趋势基本一致,但改变车底和气坝时,两种仿真得到的气动阻力变化量相差9~15个点(counts)。

Study on the Correlation Between Digital Wind Tunnel Simulation and Open Road Simulation

In order to study the influence of computational domain on aerodynamic drag,a digital wind tunnel model is established based on the parameters of real vehicle wind tunnel.Taking the DrivAer model,a generic open source vehicle geometry,as the research object,a comparative analysis between digital wind tunnel simulation and open road simulation on 12 different vehicle patterns is carried out.The results show that difference of the aerodynamic drag obtained by two different simulations is relatively small,about 6~12 counts for smooth underbody,while the difference increases to 17~22 counts for detailed underbody.The changing trends of aerodynamic drag between two different vehicle patterns obtained by two different simulations are basically the same,but when underbody and airdam change,the difference in aerodynamic drag obtained by two different simulations reaches 9~15 counts.