Aerodynamic Investigation of Cooling Drag of a Production Sedan Part 2: CFD Results

Paper #:
  • 2017-01-1528

Published:
  • 2017-03-28
Abstract:
Cooling Drag is a metric that measures the influence of airflow travelling through the open grille of a ground vehicle on overall vehicle drag, both internally (engine airflow) and externally (interference airflow). With the interference effects considered, a vehicles Cooling Drag can be influenced by various flow fields around the vehicle, not just the airflow directly entering or leaving the engine bay. For this reason, computational fluid dynamics (CFD) simulations are particularly difficult. With insights gained from a previously conducted set of experimental studies a CFD validation effort was undergone to understand which flow field characteristics contribute to CFD/test discrepancies. A Lattice-Boltzmann LES method was used to validate several test points and comparison using integral drag values, surface pressures, underbody velocities and cooling pack mass flows is presented herein. The test points include cooling pack configuration changes, underbody shield changes, vehicle attitude changes and engine bay blockage changes in both static and moving ground wind tunnel conditions at 80 MPH. This paper represents the second of a two-part effort, with experimental and numerical foci respectively.
Also in:
  • SAE International Journal of Passenger Cars - Mechanical Systems - V126-6
  • SAE International Journal of Passenger Cars - Mechanical Systems - V126-6EJ
Topic:
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