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Numerical Drag Reduction Studies On Generic Truck Models Using Passive And Active Flow Control
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Book Synopsis Numerical Drag Reduction Studies on Generic Truck Models Using Passive and Active Flow Control by : Miles E. Bellman
Download or read book Numerical Drag Reduction Studies on Generic Truck Models Using Passive and Active Flow Control written by Miles E. Bellman and published by . This book was released on 2009 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Parallel Computational Fluid Dynamics by : Rupak Biswas
Download or read book Parallel Computational Fluid Dynamics written by Rupak Biswas and published by DEStech Publications, Inc. This book was released on 2010 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drag Reduction of a Generic Car Model by Active Boundary Layer Control by : Mohammad Abbaspour
Download or read book Drag Reduction of a Generic Car Model by Active Boundary Layer Control written by Mohammad Abbaspour and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Design of Active Flow Control Systems Aimed Towards Drag Reduction in Heavy Vehicles by : David E. Manosalvas-Kjono
Download or read book Aerodynamic Design of Active Flow Control Systems Aimed Towards Drag Reduction in Heavy Vehicles written by David E. Manosalvas-Kjono and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The trucking industry is an irreplaceable sector of our economy. Over 80% of the world population relies on it for the transportation of commercial and consumer goods. In the US alone, this industry is responsible for over 38% of fuel consumption as it distributes over 70% of our freight tonnage. In the design of these vehicles, particular emphasis has been placed on equipping them with a strong engine, a relatively comfortable cabin, a spacious trailer, and a flat back to improve loading efficiency. The geometrical design of these vehicles makes them prone to flow separation and at highway speeds overcoming aerodynamic drag accounts for over 65% of their energy consumption. The flat back on the trailer causes flow to separate, which generates a turbulent wake. This region is responsible for a significant portion of the aerodynamic drag and currently the most popular solution is the introduction of flat plates attached to the back of the trailer to push the wake downstream. These passive devices improve the aerodynamic performance of the vehicle, but leave opportunities for significant improvement that can only be achieved with active systems. The current procedure to analyze the flow past heavy vehicles and design add-on drag reduction devices focuses on the use of wind tunnels and full-scale tests. This approach is very time consuming and incredibly expensive, as it requires the manufacturing of multiple models and the use of highly specialized facilities. This Dissertation presents a computational approach to designing Active Flow Control (AFC) systems to reduce drag and energy consumption for the trucking industry. First, the numerical tools were selected by studying the capabilities of various numerical schemes and turbulence model combinations using canonical bluff bodies. After various numerical studies and comparisons with experimental results, the Jameson-Schmidt-Turkel (JST) scheme in combination with the Shear-Stress-Transport (SST) turbulence model were chosen. This combination of tools was used to study the effect of AFC in the Ground Transportation System (GTS) model, which is a simplified representation of a tractor-trailer introduced by the US Department of Energy to study the separation behind this type of vehicle and the drag it induces. Using the top-view of the GTS model as a two-dimensional representation of a heavy vehicle, the effect that the Coanda jet-based AFC system has on the wake and integrated forces have been studied. These two-dimensional studies drove the development of the design methodology presented, and produced the starting condition for the three-dimensional Coanda surface geometry and the jet velocity profile. In addition, the influence in wake stability that this system demonstrated when operating near its optimum drag configuration, allowed for the decoupling of time from the three-dimensional design process. A design methodology that minimizes the number of required function evaluations was developed by leveraging insights obtained from previous studies; using the physical changes in the flow induced by the AFC system to eliminate the need for time integration during the design process; and leveraging surrogate model optimization techniques . This approach significantly reduces the computational cost during the design of AFC drag reduction systems and has led to the design of a system that reduces drag by over 19% and power by over 16%. In the US trucking fleet alone, these energy savings constitute 8.6 billion gallons of fuel that will not be burned and over 75 million tons of CO2 that will not be released into the atmosphere each year.
Book Synopsis The Aerodynamics of Heavy Vehicles II: Trucks, Buses, and Trains by : Fred Browand
Download or read book The Aerodynamics of Heavy Vehicles II: Trucks, Buses, and Trains written by Fred Browand and published by Springer Science & Business Media. This book was released on 2008-09-30 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is our pleasure to present these proceedings for “The Aerodynamics of Heavy Vehicles II: Trucks, Buses and Trains” International Conference held in Lake - hoe, California, August 26-31, 2007 by Engineering Conferences International (ECI). Brought together were the world’s leading scientists and engineers from industry, universities, and research laboratories, including truck and high-speed train manufacturers and operators. All were gathered to discuss computer simu- tion and experimental techniques to be applied for the design of the more efficient trucks, buses and high-speed trains required in future years. This was the second conference in the series. The focus of the first conference in 2002 was the interplay between computations and experiment in minimizing ae- dynamic drag. The present proceedings, from the 2007 conference, address the development and application of advanced aerodynamic simulation and experim- tal methods for state-of-the-art analysis and design, as well as the development of new ideas and trends holding promise for the coming 10-year time span. Also - cluded, are studies of heavy vehicle aerodynamic tractor and trailer add-on - vices, studies of schemes to delay undesirable flow separation, and studies of - derhood thermal management.
Book Synopsis Turbulence Control by Passive Means by : E. Coustols
Download or read book Turbulence Control by Passive Means written by E. Coustols and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 4th European Drag Reduction Meeting
Book Synopsis Turbulent Drag Reduction by Surfactant Additives by : Feng-Chen Li
Download or read book Turbulent Drag Reduction by Surfactant Additives written by Feng-Chen Li and published by John Wiley & Sons. This book was released on 2012-01-10 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent drag reduction by additives has long been a hot research topic. This phenomenon is inherently associated with multifold expertise. Solutions of drag-reducing additives are usually viscoelastic fluids having complicated rheological properties. Exploring the characteristics of drag-reduced turbulent flows calls for uniquely designed experimental and numerical simulation techniques and elaborate theoretical considerations. Pertinently understanding the turbulent drag reduction mechanism necessities mastering the fundamentals of turbulence and establishing a proper relationship between turbulence and the rheological properties induced by additives. Promoting the applications of the drag reduction phenomenon requires the knowledge from different fields such as chemical engineering, mechanical engineering, municipal engineering, and so on. This book gives a thorough elucidation of the turbulence characteristics and rheological behaviors, theories, special techniques and application issues for drag-reducing flows by surfactant additives based on the state-of-the-art of scientific research results through the latest experimental studies, numerical simulations and theoretical analyses. Covers turbulent drag reduction, heat transfer reduction, complex rheology and the real-world applications of drag reduction Introduces advanced testing techniques, such as PIV, LDA, and their applications in current experiments, illustrated with multiple diagrams and equations Real-world examples of the topic’s increasingly important industrial applications enable readers to implement cost- and energy-saving measures Explains the tools before presenting the research results, to give readers coverage of the subject from both theoretical and experimental viewpoints Consolidates interdisciplinary information on turbulent drag reduction by additives Turbulent Drag Reduction by Surfactant Additives is geared for researchers, graduate students, and engineers in the fields of Fluid Mechanics, Mechanical Engineering, Turbulence, Chemical Engineering, Municipal Engineering. Researchers and practitioners involved in the fields of Flow Control, Chemistry, Computational Fluid Dynamics, Experimental Fluid Dynamics, and Rheology will also find this book to be a much-needed reference on the topic.
Book Synopsis Active and Passive Separation Control for Drag Reduction of a Maneuvering Hull Form by : James Crandall Schulmeister
Download or read book Active and Passive Separation Control for Drag Reduction of a Maneuvering Hull Form written by James Crandall Schulmeister and published by . This book was released on 2017 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary layer separation is a source of large fluid dynamic forces on many engineered vehicles and structures, limiting the speed and efficiency at which we transport people and goods. The maneuvering of ocean and air vehicles in particular is limited by resistance due to cross-flow separation. Hull forms with lower hydrodynamic resistance in maneuvers are able to follow trajectories with tighter turns and at higher speeds. Despite the progress that has been made in the control of two dimensional flow separation, little has been done to apply flow control to complex three-dimensional separation from maneuvering hull forms. This thesis studies and develops mechanisms for mitigating three-dimensional cross-flow separation to reduce the drag of hull forms in maneuvers. A new strategy is proposed for designing flow control mechanisms for the three dimensional flow past maneuvering hull forms based on the unsteady cross-flow analogy. The unsteady cross-flow analogy relates the steady flow past a three-dimensional body to an analogous unsteady two-dimensional flow past a cylinder that changes size and shape in time. This provides a framework for adapting two-dimensional drag reduction techniques to the three-dimensional flow. In addition, the unsteady cross-flow analogy is computationally inexpensive and so is suitable for iterative use in preliminary design. The new strategy is considered by first implementing the unsteady cross-flow analogy in numerical simulations. Next, passive and active flow control mechanisms are studied experimentally for drag reduction of a circular cylinder and then adapted through the analogy for drag reduction of a slender body at an angle of attack. Passive control is exerted through modifications to the shape of the body and active control is exerted with rotating control cylinders. Both passive and active methods are experimentally demonstrated to reduce the drag. The experimental results also confirm key predictions of the unsteady cross-flow analogy, demonstrating that it is a promising tool for developing three-dimensional separation control techniques.
Book Synopsis Numerical Studies of Laminar and Turbulent Drag Reduction by : Ramakrishna Balasubramanian
Download or read book Numerical Studies of Laminar and Turbulent Drag Reduction written by Ramakrishna Balasubramanian and published by . This book was released on 1981 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Aerodynamics of Heavy Vehicles III by : Andreas Dillmann
Download or read book The Aerodynamics of Heavy Vehicles III written by Andreas Dillmann and published by Springer. This book was released on 2015-08-19 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented at the International conference “The Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains” held in Potsdam, Germany, September 12-17, 2010 by Engineering Conferences International (ECI). Leading scientists and engineers from industry, universities and research laboratories, including truck and high-speed train manufacturers and operators were brought together to discuss computer simulation and experimental techniques to be applied for the design of more efficient trucks, buses and high-speed trains in the future. This conference was the third in the series after Monterey-Pacific Groove in 2002 and Lake Tahoe in 2007.The presentations address different aspects of train aerodynamics (cross wind effects, underbody flow, tunnel aerodynamics and aeroacoustics, experimental techniques), truck aerodynamics (drag reduction, flow control, experimental and computational techniques) as well as computational fluid dynamics and bluff body, wake and jet flows.
Book Synopsis Modal Analysis and Flow Control for Drag Reduction on a Sport Utility Vehicle by : Stéphie Edwige
Download or read book Modal Analysis and Flow Control for Drag Reduction on a Sport Utility Vehicle written by Stéphie Edwige and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The automotive industry dedicates a lot of effort to improve the aerodynamical performances of road vehicles in order to reduce its carbon footprint. In this context, the target of the present work is to analyze the origin of aerodynamic losses on a reduced scale generic Sport Utility Vehicle and to achieve a drag reduction using an active flow control strategy. After an experimental characterization of the flow past the POSUV, a cross-modal DMD analysis is used to identify the correlated periodical features responsible for the tailgate pressure loss. Thanks to a genetic algorithm procedure, 20% gain on the tailgate pressure is obtained with optimal pulsed blowing jets on the rear bumper. The same cross-modal methodology allows to improve our understanding of the actuation mechanism. After a preliminary study of the 25° inclined ramp and of the Ahmed Body computations, the numerical simulation of the POSUV is corroborated with experiments using the cross-modal method. Deeper investigations on the three-dimensional flow characteristics explain more accurately the wake flow behavior. Finally, the controlled flow simulations propose additional insights on the actuation mechanisms allowing to reduce the aerodynamic losses.
Book Synopsis Drag Reduction of Motor Vehicles by Active Flow Control Using the Coanda Effect by : Dieter Geropp
Download or read book Drag Reduction of Motor Vehicles by Active Flow Control Using the Coanda Effect written by Dieter Geropp and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Drag Reduction Technologies by : Peter Thiede
Download or read book Aerodynamic Drag Reduction Technologies written by Peter Thiede and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: ------------------------------------------------------------ This volume contains the Proceedings of the CEAS/DragNet European Drag Reduction Conference held on 19-21 June 2000 in Potsdam, Germany. This conference, succeeding the European Fora on Laminar Flow Technology 1992 and 1996, was initiated by the European Drag Reduction Network (DragNet) and organised by DGLR under the auspice of CEAS. The conference addressed the recent advances in all areas of drag reduction research, development, validation and demonstration including laminar flow technology, adaptive wing concepts, turbulent and induced drag reduction, separation control and supersonic flow aspects. This volume which comprises more than 40 conference papers is of particular interest to engineers, scientists and students working in the aeronautics industry, research establishments or academia.
Book Synopsis Experimental Study on Truck Related Power Losses by : Erwin Adi Hartono
Download or read book Experimental Study on Truck Related Power Losses written by Erwin Adi Hartono and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Drag Reduction by : Haecheon Choi
Download or read book Turbulent Drag Reduction written by Haecheon Choi and published by . This book was released on 1992 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigations of Base Drag Reduction Using Passive Jet Flow Control by : William B Bartow
Download or read book Experimental Investigations of Base Drag Reduction Using Passive Jet Flow Control written by William B Bartow and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is focused on the experimental investigation of an extended rear view mirror and the development of near-wake flow in an effort to reduce the overall base pressure drag of the model. The passive flow control technique was employed through a circumferential slot of the rearward facing edge of a bluff body to deliver a passive jet in the direction of the free stream. The passive jet employs the surrounding high energy free stream air through an intake slot in the front of the model in order to enhance the mixing layer of the immediate wake region in addition to energizing the wake area flow through entrainment. These effects subsequently caused a reduction of the effects of adverse pressure gradients that are associated with separation of the free stream shear layer over the over the passive jet model surface. The jet produced along the rear surface not only increased the turbulence of the mixing layer, but can also be directly tied to the coherent nature of the wake area flow. Using Two Dimensional Two Component (2D2C) in addition to Two Dimensional Three component (2D3C) Particle Image Velocimetry applied to our model in an open circuit wind tunnel, results show a substantial reduction in the overall wake area for which we attribute to the enhancements due to mixing effects of the passive jet interacting with the free stream shear layer. Flow entrainment from enhanced vorticity through the production coherent structures are believed to initiate the mixing layer earlier, in addition to increase the growth rate of the mixing layer while also attributing to the increase in the overall shear layer thickness as well. Particle Image Velocimetry (PIV) was carried out on an automobile mirror model with three configurations in order to investigate the effects of a baseline model including the absence of a passive jet mixing, a modified model including a small area circumferential jet and a heavily modified model including a large circumferential slot area jet. In combination with PIV, Partial Orthogonal Decomposition (POD) also referred to as the Karhunen Loeve expansion, was also applied in order to analyze the underlying large scale structures and dominant behaviors that would otherwise be hard to identify in the immediate wake flow structure. The mirror models used for testing was designed and produced to provide three specific testing configurations, baseline, Jet 1 and Jet 2. In order to proceed with the testing of the mirror models, the design and manufacturing of a reinforced force balance mounting apparatus was necessary in order to provide a more rigid and secure platform to measure aerodynamic loads of the mirror and future designs. The nature of the new design includes multiple support location in order to more equally distribute the loading in addition to bearings to assist in experiments that require a rotation of the model in order to increase the angle with respect to the free steam flow.
Book Synopsis Active Flow Control for Drag Reduction of a Square-back Car Model by : Robin Placzek
Download or read book Active Flow Control for Drag Reduction of a Square-back Car Model written by Robin Placzek and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
