Browsing Department of Mechanical Engineering & the Built Environment by Subjects
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Bypass transition in separated-reattached flows under elevated free-stream turbulenceLaminar-to-turbulent transition is of great practical interest as it occurs in many engineering flows and often plays a critical role in aerodynamics and heat transfer performance of those flow devices. There could be many routes through transition, depending on flow configuration, geometry and the way in which transition is initiated by a wide range of possible background disturbances such as free-stream turbulence, pressure gradient, acoustic noise, wall roughness and obstructions, periodic unsteady disturbance and so on. This paper presents a brief overview of transition in general and focuses more on the transition process in the free shear layer of separated-reattached flows, demonstrating that above certain free-stream turbulence intensity a so called bypass transition could occur
Impact of the truck wave region to the aerodynamics of saloon car.A wake region will be produced by truck when it is travelling at their maximum allowance speed which is 56 miles per hour. The wake region can be seen clearly when a truck travelling at a wet road. The wake region has its own force which will affecting any vehicle travelling behind or next to the truck. This paper presents a numerical study of the flow field in the aerodynamics of the saloon effecting by the wake region. Simulation will be carried out for different position of the saloon next to the truck. The numerical study will be validated using Ahmed body to determine the mesh and domain size. The velocity will be set at 56 miles per hour and assuming the truck will be travelling alongside the motorway. The rotating region will be used for truck and saloon and the angular velocity will be calculated based on the circumference of its tires. Detailed analysis and result such as CD and CL together with the x-y chart will be presented to provide a better understanding of the effect of truck wake region to the saloon when it is behind or next to the truck.
An investigation into the effect of drag coefficient on overtaking of car.The purpose of this report is the effect of the drag coefficient on the car when it is travelling on the road and at different positions while overtaking. The investigation uses SolidWorks Flow simulation software to conduct CFD [. A car and truck has been designed in actual dimensions using SolidWorks. After performing the validation of the software, the simulation is performed having the car in four different positions. The results will determine the drag coefficient and how it is affected in the different positions.