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Turbulent Navierstokes Flow Analysis Of An Advanced Semispan Diamondwing Model In Tunnel And Free Air At Highlift Conditions
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Book Synopsis Turbulent NavierStokes flow analysis of an advanced semispan diamondwing model in tunnel and free air at highlift conditions by :
Download or read book Turbulent NavierStokes flow analysis of an advanced semispan diamondwing model in tunnel and free air at highlift conditions written by and published by DIANE Publishing. This book was released on with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721032778 Total Pages :40 pages Book Rating :4.0/5 (327 download)
Book Synopsis Turbulent Navier-Stokes Flow Analysis of an Advanced Semispan Diamond-Wing Model in Tunnel and Free Air at High-Lift Conditions by : National Aeronautics and Space Administration (NASA)
Download or read book Turbulent Navier-Stokes Flow Analysis of an Advanced Semispan Diamond-Wing Model in Tunnel and Free Air at High-Lift Conditions written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-12 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent Navier-Stokes computational results are presented for an advanced diamond wing semispan model at low-speed, high-lift conditions. The numerical results are obtained in support of a wind-tunnel test that was conducted in the National Transonic Facility at the NASA Langley Research Center. The model incorporated a generic fuselage and was mounted on the tunnel sidewall using a constant-width non-metric standoff. The computations were performed at to a nominal approach and landing flow conditions.The computed high-lift flow characteristics for the model in both the tunnel and in free-air environment are presented. The computed wing pressure distributions agreed well with the measured data and they both indicated a small effect due to the tunnel wall interference effects. However, the wall interference effects were found to be relatively more pronounced in the measured and the computed lift, drag and pitching moment. Although the magnitudes of the computed forces and moment were slightly off compared to the measured data, the increments due the wall interference effects were predicted reasonably well. The numerical results are also presented on the combined effects of the tunnel sidewall boundary layer and the standoff geometry on the fuselage forebody pressure distributions and the resulting impact on the configuration longitudinal aerodynamic characteristics.Ghaffari, Farhad and Biedron, Robert T. and Luckring, James M.Langley Research CenterNAVIER-STOKES EQUATION; SEMISPAN MODELS; TURBULENT FLOW; WIND TUNNEL TESTS; LIFT; LOW ASPECT RATIO WINGS; COMPUTATIONAL FLUID DYNAMICS; AERODYNAMIC CHARACTERISTICS; WALL FLOW; FUSELAGES; AERODYNAMIC INTERFERENCE; PITCHING MOMENTS; PRESSURE DISTRIBUTION; FOREBODIES
Book Synopsis Analysis of Post-support and Wind-tunnel Wall Interference on Flow Field about Subsonic High-lift High-speed Research Configuration by : Wendy B. Lessard
Download or read book Analysis of Post-support and Wind-tunnel Wall Interference on Flow Field about Subsonic High-lift High-speed Research Configuration written by Wendy B. Lessard and published by . This book was released on 2000 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study was performed to determine how significant the interference effects of the wind-tunnel model support system and tunnel walls can be for a high-speed configuration during takeoff and landing conditions. A 5-percent scale model of the Technology Concept Airplane was recently tested in the Langley 14- by 22-Foot Subsonic Tunnel. The model was numerically modeled with and without the support and tunnel walls and compared with experimental data. Detailed analysis of the flow provided additional insight concerning what effects the postsupport and tunnel walls had on the flow field. This study revealed that although the overall forces and moments could be experimentally accounted for, the detailed flow features, such as the surface pressure distributions, could not be accurately simulated without including the post in the computations.
Book Synopsis A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows by : Trong T. Bui
Download or read book A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows written by Trong T. Bui and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Philippe Godin Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780612942325 Total Pages :272 pages Book Rating :4.9/5 (423 download)
Book Synopsis Turbulence Modeling for High-lift Multi-element Airfoil Configurations [microform] by : Philippe Godin
Download or read book Turbulence Modeling for High-lift Multi-element Airfoil Configurations [microform] written by Philippe Godin and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study provides a detailed comparison of two turbulence closures for aerodynamic flows around high-lift airfoils; the first based on turbulent viscosity and the second on the algebraic Reynolds-stress approximation. A detailed analysis of their derivation helps shed light on their inherent limitations in predicting complex flow phenomena such as confluent boundary layers and flow separation found in typical take-off and landing conditions. One of each of the following categories: one-equation, two-equation, IARSM and EARSM is selected and compared on several low-speed high-lift configurations. Comparisons to experimental data for both mean flow and turbulence quantities are provided for all cases studied. Amongst the turbulent viscosity models coded and studied are the Spalart-Allmaras, Baldwin-Barth, Wilcox k - o and Menter's Shear Stress Transport model. A parameter study based on different pressure-strain correlations and dissipation models (or near-wall treatment) is included when studying the algebraic Reynolds-stress models for both the explicit (EARSM) and the more traditional or implicit (IARSM) forms. Results are generally very promising and of sufficient accuracy for engineering interest. Overall, the study indicates that for flows around low-speed high-lift airfoils, the algebraic Reynolds-stress construct does not represent a higher level of description than the eddy viscosity models since it fails to improve on accuracy. The basic underlying assumption of weak-equilibrium in algebraic Reynolds-stress models is outperformed by well calibrated eddy-viscosity models.
Book Synopsis Multi-Block Parallel Navier-Stokes Simulation of Unsteady Wind Tunnel and Ground Interference Effects by : Breno M. Castro
Download or read book Multi-Block Parallel Navier-Stokes Simulation of Unsteady Wind Tunnel and Ground Interference Effects written by Breno M. Castro and published by . This book was released on 2001-09-01 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical investigation of unsteady wind tunnel and ground interference effects is carried out in the time domain to study the transonic flutter characteristics of the NLR 7301 section inside a wind tunnel and the thrust generation characteristics of a NACA 0014 airfoil plunging near a ground plane. A parallelized, multi-block, deforming grid, unsteady flow-solver is coupled with a two-degree-of-freedom structural model. For the transonic flutter problem, two types of porous-wall boundary-conditions are implemented and tested for the boundaries representing the tunnel walls. The type of porous boundary condition is found to influence significantly both steady and unsteady solutions. Results show that the free-flight flutter behavior may differ significantly from the behavior found in a porous wind tunnel because of the strong dependence on the tunnel porosity parameter and the proximity of the walls. An analysis of the trailing edge boundary condition is performed for the airfoil in ground effect. The computations show that this boundary condition influences the solution only when non-linearities are present in the flow-field, although parameters averaged through a cycle of oscillation are not affected significantly. The same behavior is observed for the influence of the turbulence model on the fully-turbulent, unsteady computations. However, the best agreement with low Reynolds number, experimental data is obtained when the flow is assumed laminar and no turbulence model is applied.
Book Synopsis Direct and Large-eddy Simulation XI by : Maria Vittoria Salvetti
Download or read book Direct and Large-eddy Simulation XI written by Maria Vittoria Salvetti and published by . This book was released on 2019 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the 11th workshop on Direct and Large Eddy Simulation (DLES), which was held in Pisa, Italy in May 2017. The event focused on modern techniques for simulating turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structures, as Direct Numerical Simulation (DNS), Large-Eddy Simulation (LES) or hybrid models based on a combination of LES and RANS approaches. In light of the growing capacities of modern computers, these approaches have been gaining more and more interest over the years and will undoubtedly be developed and applied further. The workshop offered a unique opportunity to establish a state-of-the-art of DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows and to discuss about recent advances and applications. This volume contains most of the contributed papers, which were submitted and further reviewed for publication. They cover advances in computational techniques, SGS modeling, boundary conditions, post-processing and data analysis, and applications in several fields, namely multiphase and reactive flows, convection and heat transfer, compressible flows, aerodynamics of airfoils and wings, bluff-body and separated flows, internal flows and wall turbulence and other complex flows.
Book Synopsis Wind Tunnel Flow Quality and Data Accuracy Requirements by : F. Steinle
Download or read book Wind Tunnel Flow Quality and Data Accuracy Requirements written by F. Steinle and published by . This book was released on 1982 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulent Flow written by R. J.. Garde and published by New Age International. This book was released on 2000-01-01 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Book Presents A Detailed Exposition Of The Various Dimensions Of Turbulent Flow. In Ten Chapters The Book Covers Laminar Flow, Transition From Laminar To Turbulent Flow, The Nature Of Turbulence, Equations Of Motion, Statistical Theory Of Turbulence, Turbulence Models, Measurement Of Turbulence, And Descriptions Of Wall Turbulence Shear Flows, Free Surface Flows, And Free Turbulence Shear Flows.The Book Would Be Extremely Useful For Practising Engineers, Particularly In The Field Of Hydraulic Analysis And Design, Building Aerodynamics And Environmental Engineering.Graduate And Senior Undergraduate Students Would Also Find This Book To Be An Authoritative Reference Source.
Book Synopsis Air Bubble Entrainment in Free-Surface Turbulent Flows by : Hubert Chanson
Download or read book Air Bubble Entrainment in Free-Surface Turbulent Flows written by Hubert Chanson and published by . This book was released on 1995 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ground and Flight Evaluation of a Small-Scale Inflatable-Winged Aircraft by :
Download or read book Ground and Flight Evaluation of a Small-Scale Inflatable-Winged Aircraft written by and published by . This book was released on 2002 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A small-scale, instrumented research aircraft was flown to investigate the flight characteristics of inflatable wings. Ground tests measured the static structural characteristics of the wing at different inflation pressures, and these results compared favorably with analytical predictions. A research-quality instrumentation system was assembled, largely from commercial off-the-shelf components, and installed in the aircraft. Initial flight operations were conducted with a conventional rigid wing having the same dimensions as the inflatable wing. Subsequent flights were conducted with the inflatable wing. Research maneuvers were executed to identify the trim, aerodynamic performance, and longitudinal stability and control characteristics of the vehicle in its different wing configurations. For the angle-of-attack range spanned in this flight program.
Book Synopsis Innovation in Flight by : Joseph R. Chambers
Download or read book Innovation in Flight written by Joseph R. Chambers and published by . This book was released on 2005 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flight Physics written by E. Torenbeek and published by Springer Science & Business Media. This book was released on 2009-07-06 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knowledge is not merely everything we have come to know, but also ideas we have pondered long enough to know in which way they are related, and 1 how these ideas can be put to practical use. Modern aviation has been made possible as a result of much scienti c - search. However, the very rst useful results of this research became ava- able a considerable length of time after the aviation pioneers had made their rst ights. Apparently, researchers were not able to nd an adequate exp- nation for the occurrence of lift until the beginning of the 21st century. Also, for the fundamentals of stability and control, there was no theory available that the pioneers could rely on. Only after the rst motorized ights had been successfully made did researchers become more interested in the science of aviation, which from then on began to take shape. In modern day life, many millions of passengers are transported every year by air. People in the western societies take to the skies, on average, several times a year. Especially in areas surrounding busy airports, travel by plane has been on the rise since the end of the Second World War. Despite becoming familiar with the sight of a jumbo jet commencing its ight once or twice a day, many nd it astonishing that such a colossus with a mass of several hundred thousands of kilograms can actually lift off from the ground.
Book Synopsis Basic Aerodynamics by : Gary A. Flandro
Download or read book Basic Aerodynamics written by Gary A. Flandro and published by Cambridge University Press. This book was released on 2011-11-14 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the rapidly advancing field of flight aerodynamics, it is especially important for students to master the fundamentals. This text, written by renowned experts, clearly presents the basic concepts of underlying aerodynamic prediction methodology. These concepts are closely linked to physical principles so that they are more readily retained and their limits of applicability are fully appreciated. Ultimately, this will provide students with the necessary tools to confidently approach and solve practical flight vehicle design problems of current and future interest. This book is designed for use in courses on aerodynamics at an advanced undergraduate or graduate level. A comprehensive set of exercise problems is included at the end of each chapter.
Download or read book Field Illustrated written by and published by . This book was released on 1915 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds by : Maureen B. Tracy
Download or read book Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds written by Maureen B. Tracy and published by . This book was released on 1997 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel-flight Correlation of Shock-induced Separated Flow by : Donald L. Loving
Download or read book Wind-tunnel-flight Correlation of Shock-induced Separated Flow written by Donald L. Loving and published by . This book was released on 1966 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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