基于SST-DDES方法的汽车外气动噪声模拟与风洞试验对标分析

随着新能源汽车行业的迅猛发展，行驶过程中发动机噪声的贡献消失，气动噪声成为了最容易引起顾客抱怨的问题。相关研究表明，通过侧窗玻璃表面脉动压力产生的湍流脉动和声场是汽车在高速行驶时的主要噪声源。基于开源软件OpenFOAM，采用SST-DDES湍流模型，分别对两款不同车型的前后侧窗玻璃24个点的表面脉动压力进行了数值模拟计算，并与风洞试验测试相结合进行验证。结果表明，仿真结果与试验结果基本吻合，证明了该方法可以有效捕捉侧窗玻璃的表面脉动压力结果，为后续的车内噪声计算打下基础，同时也有效缩短了开发周期，并降低了后期实车风洞试验的测试成本。

Simulation Study and Validation Tests of Vehicle Aerodynamic Noise Based on SST-DDES Method

With the rapid development of new energy vehicle industry, engine noises have been eliminated during driving and the aerodynamic noise has become the most common cause of customer complaints.Relevant studies show that the FSP on the side window surface is the major source of vehicle noise at high speed. Based on the OpenFOAM software, the paper applies the SST-DDES method to simulate the FSP at 24 points on the front and rear side windows of two types of cars, and the results are compared with wind tunnel test results. A good agreement is found between the simulation results and the experimental results,which proves that the proposed method can effectively capture the FSP on the side window glass surface. The proposed method is in support of the subsequent calculation of vehicle interior noise, and will effectively reduce the development cycle and cost of the future vehicle wind tunnel test.