Enhancing Cabin Comfort TotalSim Uses STAR-CCM+ and Advanced Thermal Management Techniques in NextGen NASCAR Vehicles The Situation: NASCAR’s introduction in 2022 of the NextGen model race car was a large-scale platform update with the goal of modernizing the design, build and operation of their top level Cup cars. With any new car design comes new challenges, especially when moving to such a complete design overhaul. One major challenge that cropped up was maneuvering from an open under floor..