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Collection

Vehicle Aerodynamics, 2014

2014-04-01
This technical paper collection covers vehicle aerodynamic development, drag reduction and fuel economy, handling and stability, cooling flows, surface soiling and water management, vehicle internal environment, tyre aerodynamics and modelling, aeroacoustics, structural response to aerodynamic loading, simulating the on-road environment, onset flow turbulence, unsteady aerodynamics, fundamental flow structures, new test methods and facilities, new applications of computational fluid dynamics simulation, competition vehicle aerodynamics.
Collection

Fuel Injection and Sprays, 2018

2018-04-03
This collection is devoted to experimental and computational work in the area of fuel injection systems and sprays. Topics include: spray characterization, cavitation, multi-phase jet modeling, CFD models for spray processes, wall films and impingement, hydraulic circuit analysis, and dissolved gas effects.
Collection

Advanced Analysis, Design, and Optimization for Materials, Restraints, and Structures for Enhanced Automotive Safety and Weight Reduction, 2018

2018-04-03
Papers with an emphasis on, but not limited to, innovative ideas to enhance automotive safety with improved material constitutive modeling, analysis method developments, simulation and pre/post processing tools, optimization techniques, crash code developments, finite element model updating, model validation and verification techniques, dummies and occupants, restraint systems, passive safety as well as lightweight material applications and designs are included in the collection.
Collection

Thermal Systems Modeling and Simulation, 2018

2018-04-03
The papers in this collleciton focus on state of the art simulation technologies for modeling thermal systems and their application in the development and optimization of vehicle thermal management and fuel economy. The papers range from empirical, 1D modeling methods to three dimensional CFD models as well as coupled methods.
Collection

Advanced Analysis, Design, and Optimization for Materials, Restraints, and Structures for Enhanced Automotive Safety and Weight Reduction, 2017

2017-03-28
Papers with an emphasis on, but not limited to, innovative ideas to enhance automotive safety with improved material constitutive modeling, analysis method developments, simulation and pre/post processing tools, optimization techniques, crash code developments, finite element model updating, model validation and verification techniques, dummies and occupants, restraint systems, passive safety as well as lightweight material applications and designs are included in the collection.
Collection

CAD/CAM/CAE Technology, 2017

2017-03-28
This collection papers advances the knowledge in product design, manufacturing processes, and engineering analysis using the state-of-the-art computer technology. The scope includes such areas as CFD, manufacturing and assembly simulation, crash-worthiness, computational mechanics, mold flow, ride simulation, ergonomic design, NVH, reverse engineering, etc. Developments in numerical methods applicable to automotive engineering problems are also included.
Collection

Vehicle Aerodynamics, 2017

2017-03-28
Vehicle aerodynamic development, drag reduction and fuel economy, handling and stability, cooling flows, surface soiling and water management, vehicle internal environment, tyre aerodynamics and modelling, aeroacoustics, structural response to aerodynamic loading, simulating the on-road environment, onset flow turbulence, unsteady aerodynamics, fundamental flow structures, new test methods and facilities, new applications of computational fluid dynamics simulation, competition vehicle aerodynamics.
Collection

Fuel Injection and Sprays, 2017

2017-03-28
This collection is devoted to experimental and computational work in the area of fuel injection systems and sprays. Topics include: spray characterization, cavitation, multi-phase jet modeling, CFD models for spray processes, wall films and impingement, hydraulic circuit analysis, and dissolved gas effects.
Collection

Thermal Systems Modeling and Simulation, 2017

2017-03-28
The papers in this collleciton focus on state of the art simulation technologies for modeling thermal systems and their application in the development and optimization of vehicle thermal management and fuel economy. The papers range from empirical, 1D modeling methods to three dimensional CFD models as well as coupled methods
Video

The New Audi A6/A7 Family - Aerodynamic Development of Different Body Types on One Platform

2011-11-17
The presentation describes the aerodynamic development and optimization process of the three different new models of the Audi A6/A7 family. The body types of these three models represent the three classic aerodynamic body types squareback, notchback and fastback. A short introduction of the flow structures of these different body types is given and their effect on the vehicle aerodynamic is described. In order to achieve good aerodynamic performance, the integration into the development process of the knowledge about these flow phenomena and the breakdown of the aerodynamic resistance into its components friction- and pressure drag as well as the induced drag is very important. The presentation illustrates how this is realized within the aerodynamic development process at Audi. It describes how the results of CFD simulations are combined with wind tunnel measurements and how the information about the different flow phenomena were used to achieve an aerodynamic improvement.
Video

Spotlight on Design Insight: Simulation Tools for Engine Design

2016-04-03
In “Simulation Tools for Engine Design” engineers from Ricardo Software discuss the use of simulation software in new powertrain development. Another engineer, this time from General Motors, talks about how simulation tools helped them solve the challenge of fuel flow reversion while designing the new turbocharged Cadillac V6 engine. This episode highlights: The challenge of simulating complex and combined systems in one vehicle An example of how a library of components in a software package can be chosen to form a specific system and analyzed How computational fluid dynamics simulation tools were used to help redesign a new planum Also Available in DVD Format To subscribe to a full-season of Spotlight on Design, please contact SAE Corporate Sales: CustomerSales@sae.org or 1-888-875-3976.
Technical Paper

Numerical Investigation of Tonal Noise at Automotive Side Mirrors Due to Aeroacoustic Feedback

2020-09-30
2020-01-1514
In addition to the typical broadband noise character of wind noise, tonal noise phenomena can be much more disruptive, regardless of the overall interior noise quality of the vehicle. Whistling sounds usually occur by flow over sharp edges and resonant gaps, but can also be caused by the feedback of sound waves with laminar boundary layers or separation bubbles and the resulting frequency-selective growth of boundary layer instabilities. Such aeroacoustic feedback can e.g. occur at the side mirror of a vehicle and one compellingly needs the coupling of acoustic and flow field. A compressible large eddy simulation (LES) is in principle suitable but one has to take care of any numerical artifacts which can disturb the entire acoustic field. This paper describes the possibility to resolve aeroacoustic feedback with a commercial 2nd/3rd order finite volume CFD code.
Technical Paper

A Generic Testbody for Low-Frequency Aeroacoustic Buffeting

2020-09-30
2020-01-1515
Raising demands towards lightweight design paired with a loss of originally predominant engine noise pose significant challenges for NVH engineers in the automotive industry. From an aeroacoustic point of view, low frequency buffeting ranks among the most frequently encountered issues. The phenomenon typically arises due to structural transmission of aerodynamic wall pressure fluctuations and/or, as indicated in this work, through rear vent excitation. A possible workflow to simulate structure-excited buffeting contains a strongly coupled vibro-acoustic model for structure and interior cavity excited by a spatial pressure distribution obtained from a CFD simulation. In the case of rear vent buffeting no validated workflow has been published yet. While approaches have been made to simulate the problem for a real-car geometry such attempts suffer from tremendous computation costs, meshing effort and lack of flexibility.
Technical Paper

Modelling and Numerical Simulation of the Noise Generated by Automotive Turbocharger Compressor

2020-09-30
2020-01-1512
An effective technology to reduce emission and fuel-consumption is the use of turbochargers. A turbocharger increases the air pressure at the inlet manifold of the engine by using the waste energy from the exhaust gas to drive a turbine wheel that is linked to the compressor through a shaft. Besides the use in combustion engines, fuel cell systems for vehicle applications also need compressed air to achieve high power densities. Thereby, in fuel cell systems the noise emission of turbochargers is no longer masked by the combustion engine. In operation, the main noise sources are generated by the flow in the compressor and the different noise phenomena need to be understood in order to efficiently reduce the emitted noise and increase comfort. A huge potential in order to achieve this goal is a simulation based investigation to study in detail the flow mechanism, the aeroacoustic sources and its sound propagation.
Book

Aerodynamic Flow Visualization Techniques and Procedures

1986-02-01
Flow visualization is an important factor in the aerodynamic development of passenger cars and ground vehicles. This report offers an overview of techniques used to examine complex flow fields, concentrating on techniques used in automotive wind tunnels. Includes numerous full-color photographs showing various flow fields. The following flow visualization techniques are discussed in this report: Surface Flow Description Using Yarn Tufts Surface Flow Description Using a Continuous Oil Film Flow Field Description Using Smoke Streamers Flow Field Description Using Helium Bubbles Streamer Flow Field Description Using a Continuous Motion Survey - Computer Generated Graphics And Many More
Book

Insight: Simulation Tools for Engine Design (DVD)

2016-04-08
In "Simulation Tools for Engine Design" engineers from Ricardo Software discuss the use of simulation software in new powertrain development. Another engineer, this time from General Motors, talks about how simulation tools helped them solve the challenge of fuel flow reversion while designing the new turbocharged Cadillac V6 engine. This episode highlights: • The challenge of simulating complex and combined systems in one vehicle • An example of how a library of components in a software package can be chosen to form a specific system and analyzed • How computational fluid dynamics simulation tools were used to help redesign a new planum
Technical Paper

Correlation between Numeric Simulation and Experimental Results on Intake Manifold Development

2009-10-06
2009-36-0274
Intake manifolds have an important function on pollutants emission, which physical characteristics like regular air pressure loss and difference among runners are some factors that influences on performance and fuel consumption. To a fast development of new intake manifolds which find current targets, is necessary to use computational methods. In this case CFD was used to reduce some intermediate prototypes. However it is mandatory consider that models need adjustment and correlation with actuality to be good tools. This paper shows numeric simulations and experimental results from some manifolds, correlating and validating about several features, attributing so some confidence to model.
Technical Paper

Numerical and Experimental Analysis of a Cold Start System Used in Flex Fuel Engines with Heating of Intake Air and Ethanol

2009-10-06
2009-36-0300
The use of pure ethanol or the prevailing of it in the mixture with gasoline in flex fuel engines, led to a necessity of an auxiliary system to the cold start and engine functioning. Ethanol chemical properties can be used to explain this necessity. Ethanol is been used in Brazil for more than 30 years and many researches give support to the cold start technologic evolution. The cold start system enables the gasoline introduction into the intake manifold of flex fuel engines, when vehicles are using pure ethanol or a mixture with more ethanol than gasoline. The researches challenge is to find a way to start an engine using ethanol without the use of the cold start system using gasoline. This works presents a numerical analysis of the flow and heat transfer in a cold start system, using computational fluid dynamics. An experimental test bench developed to study a start cold system heating air and ethanol.
Technical Paper

Simultaneous Evaluation on Aerodynamics and Air-cooling Performances for Motorcycle using CFD Analysis

2009-11-03
2009-32-0138
In order to optimize the balance between aerodynamics and air-cooling performances for a motorcycle, a simulation method of external flow around a vehicle has been developed. In this paper, steady-state flow calculations were performed using two types of turbulence models, the realizable k-ε and the SST k-ω, and two levels of mesh sizes of computational models and their results were compared. To validate the computational results, wind tunnel tests were conducted and CD, CL and mean velocity of flow passing through heat exchangers were measured. The computational results on drag coefficient and mean velocity show good agreements with the experimental ones.
Technical Paper

Multiple-Cylinder Diesel Engine CFD Simulation Using VECTIS

2009-11-03
2009-32-0164
This paper presents the CFD simulation performed on a 4-cylinder in-line Diesel engine using Ricardo's engine focused commercial CFD code VECTIS. Simulation run through multiple cycles and covered processes of intake, compression, spray, combustion and exhaust. The cyclically converged solution is compare to the engine test data for cylinder pressure, charge distribution and EGR distribution, etc… Technical issues concerning multiple-cylinder analysis are discussed.
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