The Body Engineer's Role in Automotive Aerodynamics PDF Download

Author: W. H. Korff
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 14

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Book Description

Author: Kent B. Kelly
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 20

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Author: United States. Congress. House. Committee on Science and Technology. Subcommittee on Transportation, Aviation, and Communications
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 398

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 1014

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Author: Petter Ekman
Publisher: Linköping University Electronic Press
ISBN: 917929863X
Category : Electronic books
Languages : en
Pages : 96

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Book Description
Road transports are responsible for almost 18 % of the greenhouse gas emission in Europe and are today the leading cause of air pollution in cities. Aerodynamic resistance has a significant effect on fuel consumption and hence the emission of vehicles. For electric vehicles, emissions are not affected by the aerodynamics as such but instead have a significant effect on the effective range of the vehicle. In 2017, a new measurement procedure was introduced, Worldwide Harmonized Light Vehicles Test Procedure (WLTP), for measuring emissions, fuel consumption, and range. This procedure includes a new test cycle with increased average driving speed compared to the former procedure, which thereby increases the importance of the aerodynamic resistance, as it drastically increases with speed. A second effect is that the exact car configuration sold to the customer needs to be certified in terms of fuel consumption and emissions. The result is that every possible combination of optional extras, which might affect the aerodynamic resistance, needs to be aerodynamically analyzed and possibly improved. From 2021, the European Commission will introduce stricter emission regulations for new passenger cars, with the fleet-wide average lowered to 95 grams CO2=km, which puts an even higher demand on achieving efficient aerodynamics. Virtual development of the aerodynamics of road vehicles is today used to a great extent, using Computational Fluid Dynamics, as it enables faster and cheaper development. However, achieving high accuracy for the prediction of the flow field and aerodynamic forces is challenging, especially given the complexity of both the vehicle geometry in itself and the surrounding flow field. Even for a simplified generic bluff body, accurately predicting the flow field and aerodynamic forces is a challenge. The main reason for this challenge of achieving results with high accuracy is the prediction of the complex behavior of turbulence. Scale-resolving simulation (SRS) methods, such as Large Eddy Simulation (LES), where most of the turbulent structures are resolved has in many studies shown high accuracy but unfortunately to a very high computational cost. It is primarily the small turbulent structures within the near-wall region that requires a _ne resolution in both space (the mesh) and in time. This fine resolution is the reason for the very high computational cost and makes LES unfeasible for practical use in industrial aerodynamic development at present and in the near future. By modeling the turbulent structures within the near-wall region using a Reynolds-Averaged Navier-Stokes (RANS) model, and resolving the turbulence outside the region with a LES model, a coarser resolution is possible to use, resulting in significantly lower computational cost. Which used RANS model is of high importance, and especially how much turbulent viscosity the model generates, as too high values can result in suppression of the resolved turbulence. The transitioning between the RANS and LES regions have a significant effect on the results. Faster transition enables more resolved turbulence, favorable for higher accuracy, but needs to be balanced with sufficient shielding of the RANS region. If resolving the turbulence occurs within the near-wall region, and the mesh is not sufficiently fine, it can result in poor accuracy. By increasing the time-step size and disregarding best-practice guides, the computational cost can be significantly reduced. The accuracy is reasonably insensitive to the larger time step sizes until a certain degree, thereby enabling computationally cheaper SRS to achieve high accuracy of aerodynamic predictions needed to meet present and future emission regulations.

Author: Society of Automotive Engineers. Engineering Activity Board. Vehicle Configuration Committee of the Automobile Body Activity
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description

Author: Joseph Katz
Publisher: John Wiley & Sons
ISBN: 1119185742
Category : Technology & Engineering
Languages : en
Pages : 608

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Book Description
The automobile is an icon of modern technology because it includes most aspects of modern engineering, and it offers an exciting approach to engineering education. Of course there are many existing books on introductory fluid/aero dynamics but the majority of these are too long, focussed on aerospace and don’t adequately cover the basics. Therefore, there is room and a need for a concise, introductory textbook in this area. Automotive Aerodynamics fulfils this need and is an introductory textbook intended as a first course in the complex field of aero/fluid mechanics for engineering students. It introduces basic concepts and fluid properties, and covers fluid dynamic equations. Examples of automotive aerodynamics are included and the principles of computational fluid dynamics are introduced. This text also includes topics such as aeroacoustics and heat transfer which are important to engineering students and are closely related to the main topic of aero/fluid mechanics. This textbook contains complex mathematics, which not only serve as the foundation for future studies but also provide a road map for the present text. As the chapters evolve, focus is placed on more applicable examples, which can be solved in class using elementary algebra. The approach taken is designed to make the mathematics more approachable and easier to understand. Key features: Concise textbook which provides an introduction to fluid mechanics and aerodynamics, with automotive applications Written by a leading author in the field who has experience working with motor sports teams in industry Explains basic concepts and equations before progressing to cover more advanced topics Covers internal and external flows for automotive applications Covers emerging areas of aeroacoustics and heat transfer Automotive Aerodynamics is a must-have textbook for undergraduate and graduate students in automotive and mechanical engineering, and is also a concise reference for engineers in industry.

Author: V. Sumantran
Publisher:
ISBN: 9781560915942
Category : Technology & Engineering
Languages : en
Pages : 680

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Book Description
This collection of 38 SAE papers offers a window into the significant advancements that have been made over the last decade in the field of vehicle aerodynamics. Topics covered include wind-tunnel testing, on-road testing, computational simulations, thermal analysis, and acoustics. Selected examples of aerodynamic development in the design process of a vehicle are presented. This valuable resource illustrates the progress automakers have made in continually improving the level of aerodynamic efficiency of cars and trucks produced throughout the world. Sections cover: Historical Background/Overview; Wind Tunnel Testing; On-Road Testing; Computational Fluid Dynamics; Vehicle Aerodynamic Development and Drag Reduction; Aerodynamics of Engine Cooling; and Vehicle Aerodynamics and Aeroacoustics.

Author: Society of Automotive Engineers
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 512

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Book Description
Vols. for include index which has title: SAE transactions and literature developed.

Author:
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 570

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Book Description
Online version: Technical papers portion of the SAE Digital Library references thousands of SAE Technical Papers covering the latest advances and research in all areas of mobility engineering including ground vehicle, aerospace, off-highway, and manufacturing technology. Sample coverage includes fuels and lubricants, emissions, electronics, brakes, restraint systems, noise, engines, materials, lighting, and more. Your SAE service includes detailed summaries, complete documents in PDF, plus document storage and maintenance