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Computational Simulations of Airflows Related to Class-8 Trucks and Affecting Fuel Economy and Exhaust Emissions

These simulations involve very complex flow patterns about very complex vehicle geometries, and they require the leading-edge capabilities of the SimCenter’s Tenasi code for high-resolution of unsteady turbulent three-dimensional flows.

Full-Scale Simulations of Drag Reduction Devices for Class 8 Trucks, Sponsored by: Riverbend Technology InstituteFull-scale simulations of airflow past a Class-8 truck showing the effect of different mudflap designs on the aerodynamic drag force coefficient. These results show that mudflap design has an important influence on aerodynamic drag and hence fuel economy and exhaust emissions. (Sponsored by Riverbend Technology Institute, John Schaerer)

Full Scale Simulation of Trucks with Drag Reduction Devices at 9 Degrees Yaw, Sponsored by: Riverbend Technology InstituteFull-scale Simulation of airflow past a Class-8 truck showing the effect of aerodynamic drag reduction devices such as trailer splitter plates and base flaps. These results show how these devices affect the very complex flow patterns on the downwind side of a truck traveling in a cross wind at nine degrees to the direction of travel.(Sponsored by Riverbend Technology Institute, John Schaerer)

Flow Past GCM Inside NASA 7" x 10" TunnelComparison of SimCenter Tenasi flow simulations and experimental data taken at NASA’s 7 ft. by 10 ft. wind tunnel. These comparisons show that the computational flow simulations give accurate predictions of pressure distributions affecting aerodynamic drag and hence fuel economy and exhaust emissions. (Sponsored by the Department of Energy: National Transportation Research Center, Oak Ridge National Laboratory, and Lawrence Livermore National Laboratory)

Flow Around Isolated Rotating Wheel, Sponsored by: Department of EnergySimCenter flow simulation of past an isolated rotating wheel on a roadbed, showing the complex three-dimensional viscous contact jet generated where the rolling wheel contacts the roadbed. The excellent agreement with experimental measurements validates this capability of the Tenasi code. (Sponsored by the Department of Energy: National Transportation Research Center, Oak Ridge National Laboratory, and Lawrence Livermore National Laboratory)

Grid Generation Examples, Sponsored by: Tennessee Higher Education Commission Center of Excellence for Applied Computational Science and EngineeringFlow Simulations for complex flow patterns past complex vehicle geometries require very advanced geometric modeling and grid generation algorithms and software. The SimCenter is a leader in unstructured grid generation technology for viscous flow simulations. Shown here are some examples of grids generated for several complex vehicle geometries using the SimCenter’s HUGG grid-generation software system. (Sponsored by the Tennessee Higher Education Commission Center of Excellence for Applied Computational Science and Engineering at UTC)

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