Download or read book Modeling and Analysis of Transient Vehicle Underhood Thermo Hydrodynamic Events Using Computational Fluid Dynamics and High Performance Computing written by C. Wang and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has explored the preliminary design of a Computational Fluid Dynamics (CFD) tool for the analysis of transient vehicle underhood thermo-hydrodynamic events using high performance computing platforms. The goal of this tool will be to extend the capabilities of an existing established CFD code, STAR-CD, allowing the car manufacturers to analyze the impact of transient operational events on the underhood thermal management by exploiting the computational efficiency of modern high performance computing systems. In particular, the project has focused on the CFD modeling of the radiator behavior during a specified transient. The 3-D radiator calculations were performed using STAR-CD, which can perform both steady-state and transient calculations, on the cluster computer available at ANL in the Nuclear Engineering Division. Specified transient boundary conditions, based on experimental data provided by Adapco and DaimlerChrysler were used. The possibility of using STAR-CD in a transient mode for the entire period of time analyzed has been compared with other strategies which involve the use of STAR-CD in a steady-state mode at specified time intervals, while transient heat transfer calculations would be performed for the rest of the time. The results of these calculations have been compared with the experimental data provided by Adapco/DaimlerChrysler and recommendations for future development of an optimal strategy for the CFD modeling of transient thermo-hydrodynamic events have been made. The results of this work open the way for the development of a CFD tool for the transient analysis of underhood thermo-hydrodynamic events, which will allow the integrated transient thermal analysis of the entire cooling system, including both the engine block and the radiator, on high performance computing systems.
Download or read book Annual Index abstracts of SAE Technical Papers 2004 written by and published by . This book was released on 2005 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Transient Computational Fluid Dynamic Analysis of Vehicle Underhood in Heat Soak written by and published by . This book was released on 2006 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applications of Computational Fluid Dynamics Simulation and Modeling written by Suvanjan Bhattacharyya and published by BoD – Books on Demand. This book was released on 2022-10-26 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides well-balanced coverage of computational fluid dynamics analysis for thermal and flow characteristics of various thermal and flow systems. It presents the latest research work to provide insight into modern thermal engineering applications. It also discusses enhanced heat transfer and flow characteristics.
Download or read book Automotive Underhood Thermal Management Analysis Using 3 D Coupled Thermal Hydrodynamic Computer Models written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the radiation modeling effort was to develop and implement a radiation algorithm that is fast and accurate for the underhood environment. As part of this CRADA, a net-radiation model was chosen to simulate radiative heat transfer in an underhood of a car. The assumptions (diffuse-gray and uniform radiative properties in each element) reduce the problem tremendously and all the view factors for radiation thermal calculations can be calculated once and for all at the beginning of the simulation. The cost for online integration of heat exchanges due to radiation is found to be less than 15% of the baseline CHAD code and thus very manageable. The off-line view factor calculation is constructed to be very modular and has been completely integrated to read CHAD grid files and the output from this code can be read into the latest version of CHAD. Further integration has to be performed to accomplish the same with STAR-CD. The main outcome of this effort is to obtain a highly scalable and portable simulation capability to model view factors for underhood environment (for e.g. a view factor calculation which took 14 hours on a single processor only took 14 minutes on 64 processors). The code has also been validated using a simple test case where analytical solutions are available. This simulation capability gives underhood designers in the automotive companies the ability to account for thermal radiation - which usually is critical in the underhood environment and also turns out to be one of the most computationally expensive components of underhood simulations. This report starts off with the original work plan as elucidated in the proposal in section B. This is followed by Technical work plan to accomplish the goals of the project in section C. In section D, background to the current work is provided with references to the previous efforts this project leverages on. The results are discussed in section 1E. This report ends with conclusions and future scope of work in section F.
Download or read book Simulation of Tailrace Hydrodynamics Using Computational Fluid Dynamics Models written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report investigates the feasibility of using computational fluid dynamics (CFD) tools to investigate hydrodynamic flow fields surrounding the tailrace zone below large hydraulic structures. Previous and ongoing studies using CFD tools to simulate gradually varied flow with multiple constituents and forebay/intake hydrodynamics have shown that CFD tools can provide valuable information for hydraulic and biological evaluation of fish passage near hydraulic structures. These studies however are incapable of simulating the rapidly varying flow fields that involving breakup of the free-surface, such as those through and below high flow outfalls and spillways. Although the use of CFD tools for these types of flow are still an active area of research, initial applications discussed in this report show that these tools are capable of simulating the primary features of these highly transient flow fields.
Download or read book Underhood Airflow Simulation of a Passenger Car Using Computational Fluid Dynamics written by Viviam Lawrence and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavitation Modeling on the Automotive Torque Converter Using Computational Fluid Dynamics with a Mixing Plane Approach written by Matthew Shanks and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The automotive torque converter is a fluid coupling device used to transfer power, with multiplication of torque, from the engine to the transmission. Cavitation is a limiting factor in torque converter design, thus a reason for study. A three dimensional, multi-phase Reynolds-averaged Navier-Stokes computational tool is applied to model performance and cavitation in the torque converter. Cases are run for both single and multi-phase conditions, for two different speed ratios, for which performance parameters are compared to experimental data. Analysis includes that for several blade designs, two of which in detail. Periodic flow conditions were assumed, using a body force and a mixing plane approach for blade row coupling. In comparison to experimental results, the solutions found using the body force approach were accurate for some geometry configurations, however not for all. The mixing plane approach served to better conserve flow properties, and provided results of higher accuracy. An analysis of the flow features including vapor cavities, along with the numerical results are discussed in detail.
Download or read book Combustion and flow diagnostics written by SAE. and published by . This book was released on 2006 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Modeling of Vehicle Radiators Using Porous Medium Approach written by Barbaros Çetin and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A common tool for the determination of thermal characteristics of vehicle radiators is the experimental testing. However, experimental testing may not be feasible considering the cost and labor-time. Basic understanding of the past experimental data and analytical/computational modeling can significantly enhance the effectiveness of the design and development phase. One such computational modeling technique is the utilization of computational fluid dynamics (CFD) analysis to predict the thermal characteristics of a vehicle radiator. However, CFD models are also not suitable to be used as a design tool since considerable amount of computational power and time is required due to the multiple length scales involved in the problem, especially the small-scale geometric details associated with the fins. Although fins introduce a significant complexity for the problem, the repetitive and/or regular structure of the fins enables the porous medium based modeling. By porous modeling, a memory and time efficient computational model can be developed and implemented as an efficient design tool for radiators. In this work, a computational methodology is described to obtain the hydrodynamic and thermal characteristics of a vehicle radiator. Although the proposed methodology is discussed in the context of a vehicle radiator, the proposed methodology can be implemented to any compact heat exchanger with repetitive fin structures which is an important problem for many industrial applications.
Download or read book Modelling of Intakes Cavitation and Pressure Surges written by R. Higginbotham and published by Bhra Fluid Engineering. This book was released on 1989 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Computational Study of Thermo fluid Dynamics of Pulse Detonation Engines written by Alberto Dávila Urresti and published by . This book was released on 2005 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The purpose of this thesis is to use a transient Computational Fluid Dynamics computer code written in FORTRAN 90 for full reaction kinetics, to perform an analysis of the physical processes and chemical phenomena occurring on a single cycle of an ideal Pulse Detonation Engine (PDE) using a stoichiometric mixture of H2 and O2."--Leaf iii.
Download or read book Fast Transient Simulation of Vehicle Underhood in Heat Soak written by and published by . This book was released on 2006 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Analysis of Models of a Supercharger written by Curtis C. Carroll and published by . This book was released on 2004 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: When attempting to model complicated systems, there are two strategies that can be used. One is to create a model that accounts for as many phenomena in the system as possible in order to yield precise results. The other is to identify the key phenomena that affect the overall output, and then develop a simplified model based on those phenomena. While the first method can give desirable outputs, development is resource intensive. The second strategy, though not capable of the accuracy of the first, is much more cost effective and can give quantitative answers that are just as valuable as detailed outputs. In regards to an automotive supercharger, the first method has already been employed to create a computational fluid dynamics (CFD) model of airflow through the system. The data generated from this model was analyzed and compared with measured data taken at identical conditions to determine if the CFD model was modeling the supercharger correctly, both in terms of airflow and sound generation. Also, a flow model for one portion of the supercharger cycle was developed using the key phenomena model approach. Results from this model were tested for accuracy against measured data. In addition, design applications for the second model were investigated, and a test of the effects of basic design changes conducted.
Download or read book Vehicle Transient Air Conditioning Analysis written by Terry J. Hendricks and published by . This book was released on 2001 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coupled Simulation of Vehicle Dynamics and Tank Slosh written by and published by . This book was released on 2003 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer simulation of vehicle dynamics has become a valuable tool in the design of vehicles. However it is unable to simulate the complex dynamics of fluid "sloshing" in a tank on the vehicle. Computational Fluid Dynamics (CFD) analysis software is available that can predict fluid slosh however it does not facilitate computation of the vehicle's mechanical system. This is the second phase of a multiphase program to develop and demonstrate the use of CFD analysis coupled with vehicle dynamics analysis to more accurately predict the dynamics of a fluid transport system. The first phase validated that CFD analysis predicts slosh dynamics of a tank subjected to motions of a vehicle encountering typical maneuvers. The results of this study (phase 2) demonstrated the successful development of subroutines that are integrated into vehicle dynamic and CFD simulation codes.
Download or read book Transient Air Dynamics Modeling for an Advanced Alternative Fueled Engine written by Ryan Everett and published by . This book was released on 2010 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The EcoCAR challenge is a three year competition with a goal of re-engineering a 2009 General Motors crossover utility vehicle to improve vehicle emissions and fuel economy, while maintaining drivability and consumer acceptability. Ohio State's team has selected a plug-in hybrid electric vehicle (PHEV) architecture with a 1.8 L CNG Honda engine as the auxiliary power unit. The Honda engine is converted to run on E85 fuel, which requires the engine control software to be rewritten. The purpose of this research is to write a feed forward air/fuel ratio (AFR) control algorithm to better manage fuel injection during transient engine events. AFR control has a major impact on engine fuel economy and tail pipe emissions. This research investigates the accuracy of using a dynamic intake manifold filling and emptying model coupled with a linear approximation of the Taylor Series expansion to predict air flow forward in time. To better estimate air flowing passed the throttle plate and into the intake manifold, a quasi-static effective area map of the throttle was created. The control algorithm uses the throttle effective area map to improve the accuracy of air flow estimation into the intake manifold because the MAF sensor is not a reliable flow meter during transient engine events. It also uses a feed forward volumetric efficiency map to predict mass air flow exiting the intake manifold. It was found that by using feed forward control software and empirical engine maps to predict manifold air pressure forward in time, a better estimate of mass air flow entering the cylinder was achieved. The creation of this software allows the EcoCAR vehicle to better maintain a stoichiometric AFR during transients, which reduces tail pipe emissions species, including NOx, CO, and unburned Hydrocarbons.
