Autoblog and Yahoo may earn commission from links in this article.From Smoke Trails to SimulationsEarly car aerodynamic development focused on physical observation rather than simulation. Wind tunnels were first developed for aviation during the 1870s and were used by pioneers such as the Wright Brothers. Chrysler would begin building their own wind tunnel in the late 1920s, an effort that spawned their 1934 Airflow. The Airflow was a mass-produced car that introduced aerodynamic principles to the American public through a radically new profile. Rather than the day's boxy, upright models, resembling horse-drawn carriages, the Airflow had a bluff front end, eliminated valleys between the fenders and the body, and included a smooth sweeping contour from the windshield back to the rear end. Instead of calculating airflow like today's simulations, designers and engineers used wind tunnels for a visual understanding of airflow. Specific tools inside wind tunnels included smoke trails, tuft testing, and clay prototypes. Taking a closer look at wind tunnels' role in automotive design helps establish an understanding of the industry's shift toward computerized methods, along with why wind tunnels aren't extinct today. GettyWhy Wind Tunnels Became the Backbone of Automotive AerodynamicsEarly use of wind tunnels was overshadowed by styling departments, as the public prioritized features like tall grilles and ornate chrome. However, racing would reshape the automotive industry, as manufacturers realized that marginal aerodynamic gains could decide championships by the 1950s and 1960s. The 1955 Le Mans disaster further pushed race car designers toward a combination of stability and power rather than just the latter, and models like Ferrari's 512S were meticulously sculpted with downforce and drag in mind. Wind tunnels ultimately provided precise, repeatable reproductions of real-world aerodynamic conditions in a controlled environment, enabling engineers to gather valuable data. The information sourcing was a significant advancement, but it came with trade-offs.GettyThe Physical Ceiling: Cost, Time, and the Limits of Real-World TestingThe first wind tunnels were small-scale models, whereas full-scale models became more developed starting in the 1950s. Greg Fadler, Manager of Chrysler's/Stellantis' Aerodynamics Engineering and Wind Tunnel Operations, said "we test and refine the small-scale model almost until we go to production," reflecting practical, cost-effective advantages. Full-scale model testing follows for late-stage optimization and real-world data validation, but it's naturally more expensive. Additionally, wind tunnels may not perfectly replicate outdoor variability (crosswinds, turbulence, or rider fatigue), and they can struggle to match real-world airflow scaling, which can impact data precision. As cars evolved and development cycles grew significantly faster, something had to give.Need new tires? Save up to 30% at Tire RackFind the perfect tires for your exact vehicle and driving style. Click here to shop all top-tier brands, including Michelin, Bridgestone, and more, directly at Tire Rack.BMW Motorsport, Computational Fluid Dynamics (CFD) simulationBMWSupercomputers Enter the Windstream: The Rise of CFD Enter Computational Fluid Dynamics (CFD), the science of using computers to predict liquid and gas flow based on the governing equations of mass conservation, momentum, and energy. Unlike a wind tunnel, automotive aerodynamic CFD testing can be performed in a digital simulation. The equations governing these computations have been understood since the 1930s, but there was a shift in the late 2000s/early 2010s, where computers made it more feasible to solve them. CFD codes ultimately simulate the flow over a car through mathematical modeling and solving of a digitally broken-up version of the airflow. Formula 1 teams and the wider automotive industry have adopted CFD because an expensive design-to-prototype process can be virtually evaluated, with results generated under different boundary conditions in a shorter time.AdvertisementAdvertisementRelated: This EV Can Change Its Shape—and Hit 62 MPH in Just 2 SecondsWhy Wind Tunnels Didn't DisappearWhile CFD has been a significant innovation, it's vital to recognize that it didn't eliminate wind tunnels, even if some vehicles today are designed almost entirely in a virtual environment. Instead, CFD complements wind tunnel research. For example, testers can start with CFD to pre-evaluate various configurations, then limit wind tunnel testing to the most promising solutions for validation and calibration. CFD also hasn't fully replaced wind tunnels since computer simulations still face limitations. For example, calculating the effects of rotating tires can only be performed by CFD to a certain extent, along with the tires' deformation under the weight of the vehicle, according to Porsche. However, Porsche predicts significant advances in addressing these problems in the future, which should help its EV development. Simply put, wind tunnel testing isn't going extinct, as its value compared to CFD is rooted in measuring real forces rather than simulations.GMThe Next Phase: Efficiency, AI, and Virtual Aerodynamics CFD represented a pivotal point in aerodynamic optimization, but the modern era has also seen a shift from top-speed aero to efficiency-first design. This transition is largely driven by EV range sensitivity to drag. Every kWh/m of energy consumption that can be lowered makes an EV less expensive. Many consumers are on the fence about transitioning to EVs due to range anxiety, so optimizing aerodynamics is increasingly important as electrification mandates are on the horizon. In turn, automakers are regularly implementing underbody smoothing, grille reduction, and active aero, highlighting the prioritization of efficiency over top speed in aerodynamics. CFD has already increased the speed at which automakers can implement aerodynamic iterations, and AI is accelerating this pace by reducing time-consuming hurdles such as painstaking manual coding and debugging. The future isn't CFD versus wind tunnels. Instead, it's a combination of AI-driven simulation and physical validation.Related: GM Is Developing Active Aero to Make Corvettes Easier to DriftAdvertisementAdvertisementThis story was originally published by Autoblog on Jun 18, 2026, where it first appeared in the Features section. Add Autoblog as a Preferred Source by clicking here.
