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https://ptsldigital.ukm.my/jspui/handle/123456789/487267| Title: | Numerical analysis and enhancement of vehicle aerodynamics with spoilers and diffusers |
| Authors: | Behrang Daryakenari (P49914) |
| Supervisor: | Shahrir Abdullah, Prof. Ir. Dr. |
| Keywords: | Numerical analysis of vehicle aerodynamics Enhancement of vehicle aerodynamics Vehicle aerodynamics Spoilers Diffusers Universiti Kebangsaan Malaysia -- Dissertations |
| Issue Date: | 25-Apr-2014 |
| Description: | Reducing fuel consumption is the primary concern of vehicle development in order to save energy and protect the global environment. For fulfilling this purpose, reducing drag force is an essential factor for reducing fuel consumption and improving driving performance. Moreover, reducing lift force enables the vehicle to have better cornering speed and stability which is essential for road vehicles, since it improves the handling of the drive. Adjusting outer shape of a vehicle is the initial approach to fulfil this purpose while adding some components such as diffusers and spoilers are other beneficial options to improve its aerodynamic characteristics. In this study, first, the aerodynamic aspects of a simple vehicle were comprehensively studied numerically. CATIA software was used for designing additional components and Hypermesh software was used to modify the outer shape of the vehicle. OpenFOAM which is a CFD software were utilized for meshing and simulation of the flow. The SST k-ω turbulence model was modified and used to get accurate prediction of separation points of the flow. Besides, mesh optimization was performed to help get accurate results for drag and lift forces. After validating the numerical modelling, the same method was used to investigate the flow structure around a real road vehicle. The critical spots that are the main producers of drag and lift forces were identified for both cases. Later, different strategies such as adding diffuser, spoiler, tapered side wall and covering underbody were presented to reduce aerodynamic forces. All of the strategies were optimized through massive set of results which resulted in a customized design for the real vehicle. Significant reduction in lift and drag forces (105% and 30% respectively) were achieved by applying all the strategies. In addition, the generation of harmful vortices behind the vehicle were studied and identified, where later these vortices were eliminated through the similar strategies. In conclusion, this research established the effective way of simulation of a moving vehicle where good agreement achieved in compare with experimental results. Moreover, it resulted in introducing several new strategies to reduce the aerodynamic forces.,PhD |
| Pages: | 184 |
| Publisher: | UKM, Bangi |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_74852+Source01+Source010.PDF Restricted Access | 6.36 MB | Adobe PDF |  View/Open |
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