We were honored to have Razi Pooyan from General Motors Corporation present at the SIMULIA Americas Users Conference, May 3-4, 2023 in Novi, Michigan.
Abstract: Rear roof spoiler with open vent is a major concern for wind noise. This issue was identified for a program at the late stage of design. Immediate solution requires use of acoustics laminated glass for the backlite glass. However, due to initiation of tooling devices, and maturity of surface design, this solution is limited by cost and manufacturability. Therefore, aeroacoustics simulations have been performed to identify noise source, and propagation of acoustic waves resulting in undesirable cabin interior noise performance. Surface change proposals based on physical insight of the flow behavior are developed by CFD tools which led to the cabin interior noise reduction of 77% with no degradation to aero and backlite glass contamination. Based on CFD-developed surfaces, rapid prototype (RP) parts are built to evaluate CFD findings. Test results show significant improvement for cabin interior noise of up to 67% following the CFD-recommended surfaces. This study showcases the ability of CFD tool to root-cause the issue looking at the averaged and transient flow quantities, and the correlation between CFD and wind tunnel data. As the concept of rear roof spoiler with open vent is getting more popular with styling, this study serves to identify the potential wind noise issues in the early stage of vehicle development process and mitigate the risk of noticeable cabin interior noise perceived by customers..
Bio: Pooyan Razi has received his PhD in Mechanical Engineering from Texas A&M University with the focus on separated flow aerodynamics and turbulence modeling. After graduation, he joined GM in 2016, and has transitioned to the vehicle aerodynamic group since 2018. He has worked in aero group for almost 5 years, and have worked on several programs to optimize vehicle aero, noise and contamination. He is now aeroacoustics technical lead at GM, and is dealing with capability growth across GM for wind noise evaluations.
Transportation & Mobility
