Calculation of External Vehicle Aerodynamic Noise Based on LES Subgrid Model
Abstract
:1. Introduction
2. Computational Theory
2.1. LES
2.2. SLM Subgrid Model
2.3. Dynamic SLM Ssubgrid Mmodel
2.4. Acoustic Analogy Method Based on the Ffowcs Williams-Hawkings Equation
3. The Experimental Introduction
3.1. Surface Pressure Measuring
3.2. Surface Noise Intensity Measuring
4. Numerical Simulation
4.1. Simulation Model
4.2. Mesh
4.3. Boundary Condition
4.4. Transient Solution Settings
5. Simulation Results and Analysis
5.1. Simulation Results of Flow Field
5.2. Analysis of the Sound Field
5.3. Analysis of Simulation Results
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Names of Mesh | Size |
---|---|
Surface mesh of rear mirror (mm) | 1.5~3 |
Surface mesh of vehicle body (mm) | 5~20 |
The height of first boundary layer (mm) | 0.2 |
Boundary layer number | 3 |
Y+ | 5~20 |
Total number of mesh | 1.5 × 107 |
Names of Boundary | Types of Boundary | Specific Parameters |
---|---|---|
Inlet | Inlet to the velocity | 6.44 m/s; Hydraulic diameter: 6.66 m |
Outlet | Pressure outlet | Standard atmospheric pressure Hydraulic diameter: 4.4 m |
Front end of the test section | Pressure inlet | Standard atmospheric pressure |
Left end of the test section | Pressure inlet | Standard atmospheric pressure |
Other wall | Fixed wall | |
Body surface | Fixed wall |
Parameters | Settings |
---|---|
Solver | PisoFoam |
Time discretization scheme | Euler Implicit |
Spatial discretization scheme | Second order upwind scheme |
Grad schemes (P, U) | Gauss Linear |
Div schemes (phi, U, k) | Bounded Gauss Upwind |
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Hu, X.; Guo, P.; Wang, Z.; Wang, J.; Wang, M.; Zhu, J.; Wu, D. Calculation of External Vehicle Aerodynamic Noise Based on LES Subgrid Model. Energies 2020, 13, 1822. https://doi.org/10.3390/en13071822
Hu X, Guo P, Wang Z, Wang J, Wang M, Zhu J, Wu D. Calculation of External Vehicle Aerodynamic Noise Based on LES Subgrid Model. Energies. 2020; 13(7):1822. https://doi.org/10.3390/en13071822
Chicago/Turabian StyleHu, Xingjun, Peng Guo, Zewei Wang, Jingyu Wang, Mo Wang, Jia Zhu, and Dejiu Wu. 2020. "Calculation of External Vehicle Aerodynamic Noise Based on LES Subgrid Model" Energies 13, no. 7: 1822. https://doi.org/10.3390/en13071822