How is wind noise (aeroacoustics) addressed in vehicle development?

Aeroacoustic development targets reducing wind noise reaching occupants. Key areas include: A-pillar and mirror shape (managing separated flow), door/window seals (preventing leak paths), rain gutter design, roof rack integration, and surface smoothness. Development uses wind tunnel testing with acoustic instrumentation, CFD-based acoustic simulation, and on-road evaluation. Solutions include optimized pillar/mirror shapes, acoustic sealing systems, acoustic glass, and cabin insulation. Interior noise targets (typically 65-70 dB at highway speed for luxury vehicles) drive refinement of exterior shape and sealing systems.