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Numerical Calculation Of A Turbulent Axisymmetric Jet
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Book Synopsis Numerical Calculation of a Turbulent Axisymmetric Jet by : S. B. Jia
Download or read book Numerical Calculation of a Turbulent Axisymmetric Jet written by S. B. Jia and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Study of a Turbulent Jet Impinging on a Flat Plate and Flowing Into an Axisymmetric Cavity by : Ryoichi Amano
Download or read book Numerical Study of a Turbulent Jet Impinging on a Flat Plate and Flowing Into an Axisymmetric Cavity written by Ryoichi Amano and published by . This book was released on 1980 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of Some Turbulence Models to the Computation of an Axisymmetric Jet in Streaming Flow by : S. Biringen
Download or read book Application of Some Turbulence Models to the Computation of an Axisymmetric Jet in Streaming Flow written by S. Biringen and published by . This book was released on 1974 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Study of Turbulent Axisymmetric Jets Impinging on a Flat Plate and Flowing Into an Axisymmetric Cavity by : R. S. Amano
Download or read book Numerical Study of Turbulent Axisymmetric Jets Impinging on a Flat Plate and Flowing Into an Axisymmetric Cavity written by R. S. Amano and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Purpose is to obtain a better understanding of the behavior of a fluid jet used to cut solid materials.
Book Synopsis Turbulent Buoyant Jets and Plumes by : Wolfgang Rodi
Download or read book Turbulent Buoyant Jets and Plumes written by Wolfgang Rodi and published by Elsevier. This book was released on 2014-05-09 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Science & Applications of Heat and Mass Transfer: Reports, Reviews, & Computer Programs, Volume 6: Turbulent Buoyant Jets and Plumes focuses on the formation, properties, characteristics, and reactions of turbulent jets and plumes. The selection first offers information on the mechanics of turbulent buoyant jets and plumes and turbulent buoyant jets in shallow fluid layers. Discussions focus on submerged buoyant jets into shallow fluid, horizontal surface or interface jets into shallow layers, fundamental considerations, and turbulent buoyant jets (forced plumes). The manuscript then examines a turbulence model for buoyant flows and its application to vertical buoyant jets, including mathematical model, calculation of vertical buoyant jets, and explanation of velocity and temperature spreading in pure jets and pure plumes. The publication is a dependable reference for scientists and readers interested in turbulent buoyant jets and plumes.
Book Synopsis Turbulence Measurements in Axisymmetric Jets of Air and Helium by : N. R. Panchapakesan
Download or read book Turbulence Measurements in Axisymmetric Jets of Air and Helium written by N. R. Panchapakesan and published by . This book was released on 1991 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: A turbulent round jet of air discharging into quiescent air was studied experimentally. X-wire hot-wire probes mounted on a moving shuttle were used to eliminate rectification errors due to flow reversals in the intermittent region of the jet. Moments of velocity fluctuatuions up to fourth order were measured to characterize turbulent transport in the jet and to evaluate current models for triple moments that occur in the Reynolds stress equations. Fourth moments were very well described in terms of second moments by the quasi-gaussian approximation across the entire jet including the intermittent region. Profiles of third moments were found to be significantly different from earlier measurements. The Basic triple moment model that inlcluded turbulent production and models for the dissipations and the return to isotropy part of the pressure correlations was found to be unsatisfactory. When mean-strain production and a model for rapid pressure correlations were also included, predictions were satisfactory in the fully turbulent region.
Book Synopsis Investigation of High-order, High-resolution Methods for Axisymmetric Turbulent Jet Using ILES. by : António Filipe Baranda Inok
Download or read book Investigation of High-order, High-resolution Methods for Axisymmetric Turbulent Jet Using ILES. written by António Filipe Baranda Inok and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This Philosophiae Doctor thesis presents the motivation, objectives and reasoning behind the undertaken project. This research, study the capability of compressible Implicit Large Eddy Simulation (ILES) in predicting free shear layer flows, under different free stream regimes (Static and Co-flow jets). Unsteady flows or jet flows are non-uniform in structure, temperature, pressure and velocity. Turbulent mixing is of particular importance for the developing of this class of flows. As a shear layer is formed immediately downstream of the jet exhaust, an early linear instability involving exponential growth of small perturbations is introduced at the jet discharge. Beyond this development stage, in the non-linear Kelvin-Helmholtz instability region large scale vortex rings roll up, and their dynamics of formation and merging become the defining feature of the transitional shear flow into fully developed regime. This class of flows is particularly relevant to numerical predictions, as the extreme nature of the flow in question is considered as a benchmark; however, experimental data should be selected carefully as some results are controversial. To qualify the behaviour of unsteady flows, some important criteria have been selected for the analysis of the flow quantities at different regions of the flow field (average velocities, Reynolds stresses and dissipation rates). A good estimation of high-order statistics (Standard Deviation, Skewness and Kurtosis) correspond to mathematical steadiness and convergence of results. From the physical point of view, similarity analysis between jet's wake sections reveals physical steadiness in results. Spectral analysis of the different regions of the flow field could be used as a sign that the energy cascade is correctly predicted or efficiently enough since this is where the smallest scales are usually present and which in effect require to be modelled by the different numerical schemes. The flow solver has been reviewed and improved. The former, a revised version of the reconstruction numerical schemes (WENO 5th and WENO 9th orders) has been performed and tested, the correspondent results have been compared against analytical data; the latter, correction of the method to compute the Jacobian of the transformation (singularity correction), by changing from the standard algebraic to geometric method, and augmented with transparent boundary condition, giving mathematical and physical meaning to the obtained results. The flow solver improvements and review have been verified and validated through simulations of a compressible Convergent-Divergent Nozzle (CDN), and the standard and a modified version of the Shock tube test cases, where the results are gained with minimal modelling effort. The study of numerical errors associated with the simulations of turbulent flows, for unsteady explicit time step predictions, have been performed and a new formula proposed. Ten different computational methods have been employed in the framework of ILES and computations have been performed for a jet flow configuration for which experimental data and DNS are available. It can be seen that a numerical error bar can be defined that takes into account the errors arising from the different numerical building blocks of the simulation method. The effects of different grids, Riemann solvers and numerical reconstruction schemes have been considered, however, the approach can be extended to take into account the effects of the initial and boundary conditions as well as subgrid scale modelling, if applicable. From the physical analysis several observations were established, revealing that differences in terms of jet's core size are not an important parameter in terms of quantification and qualification of predictions, in other words, data should be reduced to the jet's inertial reference system. Moreover, the comparative study has been performed to identify the differences between Riemann solvers (CBS and HLLC), Low Mach number Limiting/ Corrections (LMC), numerical reconstruction schemes (MUSCL and WENO) and spatial order of accuracy (2nd-order LMC, 5th-order LMC and 9th-order schemes) in combination with the most efficient cost/resolution discretization level (Medium mesh). The comparisons between results reveals for the Static and Co-Flow jets that the CBS MUSCL 5th-order LMC and the HLLC MUSCL 5th-order LMC as the most accurate schemes in predicting this class of flows, accordingly. Furthermore, the selected numerical methods show to be in accordance with the empirical (Static) and experimental (Co-flow) results in terms of resonance frequency and/or Strouhal number; also, the expected behaviour in terms of spectral energy decay rate throughout the jet's central line is observed. To conclude the study of the Static jet case, a possible explanation for the jet's buoyancy effect is presented.
Book Synopsis Turbulent Shear Flows I by : F. Durst
Download or read book Turbulent Shear Flows I written by F. Durst and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book contains papers that have been selected from contributions to the First International Symposium on Turbulent Shear Flows which was held from the 18th to 20th April 1977 at The Pennsylvania State University, University Park, Pennsylvania, USA. Attend ees from close to 20 countries presented over 100 contributions at this meeting in which many aspects of the current activities in turbulence research were covered. Five topics received particular attention at the Symposium: Free Flows Wall Flows Recirculating Flows Developments in Reynolds Stress Closures New Directions in Modeling This is also reflected in the five chapters of this book with contributions from research workers from different countries. Each chapter covers the most valuable contributions of the conference to the particular chapter topic. Of course, there were many additional good con tributions to each subject at the meeting but the limitation imposed on the length of this volume required that a selection be made. The realization of the First International Symposium on Turbulent Shear Flows was p- sible by the general support of: U. S. Army Research Office U. S. Navy Research Office Continuing Education Center of The Pennsylvania State University The conference organization was carried out by the organizing committee consisting of: F. Durst, Universitat Karlsruhe, Karlsruhe, Fed. Rep. of Germany V. W. Goldschmidt, Purdue University, West Lafayette, Ind. , USA B. E. Launder, University of California, Davis, Calif. , USA F. W. Schmidt, Pennsylvania State University, University Park, Penna.
Book Synopsis An Experimental Study of a Turbulent Axisymmetric Jet Issuing Into a Coflowing Airstream by : S. Biringen
Download or read book An Experimental Study of a Turbulent Axisymmetric Jet Issuing Into a Coflowing Airstream written by S. Biringen and published by . This book was released on 1975 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Unsteady Flows and Transition to Turbulence by : O. Pironneau
Download or read book Numerical Simulation of Unsteady Flows and Transition to Turbulence written by O. Pironneau and published by Cambridge University Press. This book was released on 2008-05-29 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume represents the findings of the first test cases considered by ERCOFTAC. The workshop, held in Lausanne, Switzerland, in 1990, studied five test cases: boundary layer in an S-shaped duct; periodic array of cylinders; transition in a boundary layer under the influence of free-stream turbulence; predictions of an axisymmetric jet flow in a diverging duct; and predictions of the turbulent flow in an axisymmetric geometric configuration. These cases represented the interests of both the academic and industrial groups in determining the limits of various models and codes to predict real problems supported by experimental data. The articles summarize the work of each group and point to refinements and further study to perfect the models.
Book Synopsis The Prediction of an Axisymmetric Turblent Jet by a Three-equation Model of Turbulence by : S. Biringen
Download or read book The Prediction of an Axisymmetric Turblent Jet by a Three-equation Model of Turbulence written by S. Biringen and published by . This book was released on 1975 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Approximate Solution for the Axisymmetric Jet of a Laminar Compressible Fluid by : Gdalia Kleinstein
Download or read book An Approximate Solution for the Axisymmetric Jet of a Laminar Compressible Fluid written by Gdalia Kleinstein and published by . This book was released on 1961 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extension of the modified-Oseen method of Carrier, based on the linearization of the viscous term of the von Mises transformation, is presented. The method is employed to determine the velocity field associated with the laminar axisymmetric jet flow of a compressible gas with an arbitrary but constant external flow. The approximate solution is shown to be in good agreement with the exact numerical calculation of Pai.
Book Synopsis A Similarity Solution of a Second-order Model of Free Turbulent Jets with a Passive Scalar Contaminant and Its Applicability to Two-phase Jets by : Brian Ronald Cunningham
Download or read book A Similarity Solution of a Second-order Model of Free Turbulent Jets with a Passive Scalar Contaminant and Its Applicability to Two-phase Jets written by Brian Ronald Cunningham and published by . This book was released on 1980 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Numerical Analysis of a Turbulent Compressible Jet by : James R. DeBonis
Download or read book The Numerical Analysis of a Turbulent Compressible Jet written by James R. DeBonis and published by . This book was released on 2001 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Jet Aerodynamics Using the Three-dimensional Navier-Stokes Code PAB3D by : S. Paul Pao
Download or read book Numerical Simulation of Jet Aerodynamics Using the Three-dimensional Navier-Stokes Code PAB3D written by S. Paul Pao and published by . This book was released on 1996 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Calculation of the Transition Region of a Turbulent Jet by : A. S. Ginevskii
Download or read book Calculation of the Transition Region of a Turbulent Jet written by A. S. Ginevskii and published by . This book was released on 1968 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: An approximate calculation method is developed for the transition sections of plane and axisymmetric turbulent jets in a co-moving stream. It is shown why earlier methods, based on differentiation between the initial and final sections, are not applicable in the transition (mixing) region. The velocity profiles obtained by this method in the transition region turn out to be the same for plane and axisymmetric jets, and can be used to calculate the variation of the jet parameters along the stream axis by using the set of integral equations connecting the angular momentum and the energy. Limiting parameters are defined under which the results coincide with the velocity profile of the main section of the turbulent jet. It is concluded that in first approximation the external boundary of the transition layer is straight and is a continuation of the outer boundary of the outer section. The method is then demonstrated to be suitable for a determination of continuous velocity-profile deformation in the transition region. (Author).
Book Synopsis On a General Similarity Analysis for Turbulent Jet and Wake Flows by : Eduard Naudascher
Download or read book On a General Similarity Analysis for Turbulent Jet and Wake Flows written by Eduard Naudascher and published by . This book was released on 1967 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of any inhomogeneous free-turbulence flow in an incompressible fluid is predicted through the use of a general self-preservation hypothesis. The analytical solutions are verified by comparison with experimental data on mean-flow and turbulence characteristics of plane and axisymmetric jets in coaxial parallel flow with and without confinement, of an axisymmetric jet in a cross flow, and of the wake behind a self-propelled body. Emphasis is placed on the distinct turbulence structure of the various flows as revealed by the different axial variations of a shear parameter relating turbulence shear to mean velocity. The satisfactory predictions obtained by the new approach make it appear to have a more general application (e.g., to plumes and wall jets) than the examples chosen might imply. (Author).