Aeroaocustic Numerical Analysis of the Vehicle Model

Władysław Marek Hamiga,Wojciech Bronisław Ciesielka

doi:10.3390/app10249066

Władysław Marek Hamiga, Wojciech Bronisław Ciesielka

Open Access

https://doi.org/10.3390/app10249066

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Journal: Applied sciences	Publication Date: Dec 18, 2020
Citations: 7	License type: CC BY 4.0

Affiliation: AGH University of Krakow

Abstract

Understanding local phenomena connected with airflow around road vehicles allows to reduce the negative impact of transportation on the environment. This paper presents using numerical tools for Computational Fluid Dynamics (CFD) and Computational AeroAcoustic (CAA) calculation. As a model for simulation, simplified car geometry is used, which is known in the research community as an Ahmed body. The study is divided into two main parts: a validation process and a CAA analysis using the Ffowcs Williams–Hawkings (FW-H) analogy. Research is performed using k−ω Shear Stress Transport (SST) and the Large Eddy Simulation (LES) turbulence model. To compare results with other authors’ studies, three different comparison criteria are introduced: a drag coefficient for different velocities, characteristic flow structure, and velocity profiles. The CAA analysis is presented using colormaps and Fast Fourier Transformation (FFT). The methods used in this work allow visualizing the acoustic field around reference geometry and determining the frequency range for which the A-weighted sound pressure level is the highest.

Highlights

Many countries around the world have liberalized regulations on the limit values of equivalent noise level A regarding traffic noise
Numerical calculation was used in order to study an Ahmed body model
Large Eddy Simulation (LES), as well as its verification based on experimental measurement data

Summary

Introduction

Many countries around the world have liberalized regulations on the limit values of equivalent noise level A regarding traffic noise. New tire designs and silent road surfaces are created. In this situation aerodynamic noise begins to play an important role in the overall noise generated by vehicles. Based on Helfer’s research [1], it can be observed that the aerodynamic noise begins to play a similar role to the tire noise at 120 km/h for passenger cars and 80 km/h for van vehicles. For this reason, it is important to develop techniques to study these types of phenomena

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Results

Conclusion