Abstract This chapter summarizes the results of a combined numerical analysis of airflow and associated acoustic field for a passenger car. The solution model was based on a simplified inviscid approach (Euler equations). In contrast, a full, complex shape of Nissan 350z was implemented in the simulation, based on the hybrid meshing methodology. The initial process of preparation of the surface CAD model, including the procedure of closing the gaps (necessary to assure that the body is watertight), is described. The details of the unstructured/hybrid mesh generation phase are supplemented as well. The fluid flow model was extended by the acoustic box refinement, designed to support sound wave propagation up to a frequency of 5 kHz. Steady solution at forward velocity V of 100 km/h is presented. Unsteady simulations allow for identification of many known sources of the aerodynamic noise within a low-frequency part of the acoustic pressure fluctuation spectrum, attributed to specific components of the car shape. Described method may be used for various flow configurations, including the effect of new flow control devices (currently investigated experimentally and numerically at IMP PAN) on acoustic signature.
Numerical Simulation of Airflow and Acoustic Field Around a Passenger Car Model Using Euler Approach and Hybrid Meshing
2017-01-01
14 pages
Article/Chapter (Book)
Electronic Resource
English
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