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About this book

Chenyi Zhang analyzes the influences of moving ground simulation technique in wind tunnel tests. In his work, the classical investigations on vehicle shape parameters with fixed ground conditions are reviewed with modern moving ground simulation technique. The investigations are performed by means of CFD simulations and model scale wind tunnel tests at IFS, University of Stuttgart. The shape parameters of two reference vehicles – the DrivAer and the AeroSUV model with notchback, fastback and estate back – are varied and investigated. The author presents different results in drag and lift for the varied geometry parameters. The classical results of the parametric study on the vehicle basic shapes for vehicle aerodynamics could be complemented with the findings of the present research.

Table of Contents

Frontmatter

Chapter 1. Introduction

Abstract
The basic properties of a ground vehicle are influenced by aerodynamics. First of all, the energy consumption together with the emission and the top-speed of the car are all related to the aerodynamic drag. For the vehicles with new energy powertrains, although the emission is no longer an issue, the aerodynamic drag is still critical to the energy consumption and the range. In addition, vehicle aerodynamics also plays a vital role in the driving dynamics, which have an impact on the driving comfort and stability, especially in the field of sports cars and race cars.
Chenyi Zhang

Chapter 2. Basic Theories and State of the Art

Zusammenfassung
The relevant physical theories are described in the following, which give a basic understanding of the physical mechanism behind the aerodynamic forces of the vehicle and their interaction with the ground simulation. In addition, the aerodynamic investigations on the vehicle basic shape from literature are reviewed.
Chenyi Zhang

Chapter 3. Research Methods and Models

Zusammenfassung
In the present research, both CFD simulations and wind tunnel tests were applied, which are two common methods in aerodynamic research. Wind tunnel tests enable the fast results. Whereas CFD simulations provide a deep insight into the flow field information, e.g. the velocity and the pressure distribution at each point of the simulated area.
Chenyi Zhang

Chapter 4. Results of the DrivAer Model

Zusammenfassung
In the following section, the comparison of the results on the DrivAer baseline in 25 % scale between fixed and moving ground simulation is presented first. Furthermore, the investigated geometric parameters on the DrivAer are described and their results are depicted. Lastly, conclusions to the parametric study on the DrivAer model are derived based on the presented results.
Chenyi Zhang

Chapter 5. Statistical Analysis of the Parameters

Zusammenfassung
The sensitivity of the DrivAer aerodynamics forces to geometric parameters in combination with the influence of ground simulations were investigated by means of statistical analysis. In addition, the interaction between some geometric parameters was also studied. The results are depicted in the following sections.
Chenyi Zhang

Chapter 6. Transferability Study on the SUV Model

Zusammenfassung
The parametric study on the AeroSUV was carried out with both numerical and experimental methods. The investigated geometric parameters and their results with the two different ground simulation techniques are depicted in the following section.
Chenyi Zhang

Chapter 7. Overall Conclusions

Zusammenfassung
In the present work, a series of systematic investigations on geometric parameters of two types of modern vehicle models were carried out with respect to ground simulation, so that the historic results of the parametric studies could be reviewed with the state-of-the-art moving ground simulation technique. The research was performed by means of both CFD simulations and model scale testing. The numerical and experimental results show a good agreement.
Chenyi Zhang

Backmatter

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