Title :
The flow and aerodynamic noise calculation of a generic side mirror
Author :
Xiaohui, Lin ; Yiping, Wang ; Zhifu, Chen ; Guangping, Dong ; Zhengqi, Gu
Author_Institution :
State Key Lab. of Adv. Design & Manuf. for Vehicle Body, Hunan Univ., Changsha, China
Abstract :
The flow and aerodynamic noise of a generic side mirror in high-speed is evaluated using numerical simulation and experiment. The Reynolds number is Re = 5.2 × 105 basing on the mirror diameter. Transient flow field is analyzed by Large Eddy Simulation (LES), two different sub-grid scale (SGS) models named Smagorinsky-Lilly (SL) and Wall-Adapting Local Eddy-viscosity (WALE) are used to express the turbulent viscosity. Detailed velocity vectors and pressure fluctuation contours are compared by cut planes in the flow-field. Mean and transient pressure are also monitored at several points in the flow field and compared with corresponding experimental data. The sound propagation is predicted by the Ffowcs Williams-Hawkings (FW-H) acoustic analogy where wall pressure fluctuations and pressure temporal are treated as two source terms. The conclusion is that the SL model is a better candidate for this mirror simulation.
Keywords :
acoustic wave propagation; aeroacoustics; aerodynamics; flow simulation; noise; numerical analysis; turbulence; viscosity; Ffowcs Williams Hawkings acoustic analogy; Reynolds number; Smagorinsky-Lilly models; aerodynamic noise; generic side mirror; large eddy simulation; numerical simulation; pressure fluctuation contours; subgrid scale models; transient flow field; transient pressure; turbulent viscosity; velocity vectors; wall adapting local eddy viscosity; Adaptation model; Predictive models; Aerodynamic Noise; FW-H Acoustic Analogy; LES; Numerical Simulation; SGS;
Conference_Titel :
Computer-Aided Industrial Design & Conceptual Design (CAIDCD), 2010 IEEE 11th International Conference on
Conference_Location :
Yiwu
Print_ISBN :
978-1-4244-7973-3
DOI :
10.1109/CAIDCD.2010.5681972
