Characteristics Of Three Dimensional Turbulent Jets A Numerical Study
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Characteristics Of Three Dimensional Turbulent Jets
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Author : Choudary Rama Krishna Bobba
language : en
Publisher:
Release Date : 1979
Characteristics Of Three Dimensional Turbulent Jets written by Choudary Rama Krishna Bobba and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
Characteristics Of Three Dimensional Turbulent Jets A Numerical Study
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Author : CHOUDARY R. BOBBA
language : en
Publisher:
Release Date : 1981
Characteristics Of Three Dimensional Turbulent Jets A Numerical Study written by CHOUDARY R. BOBBA and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
A Computational Study Of Spatially Evolving Turbulent Plane Jets
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Author : Scott Alan Stanley
language : en
Publisher:
Release Date : 1998
A Computational Study Of Spatially Evolving Turbulent Plane Jets written by Scott Alan Stanley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Characteristics Of 3d Turbulent Jets In Crossflow
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2018-10-25
Characteristics Of 3d Turbulent Jets In Crossflow written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-25 with Science categories.
Three dimensional turbulent jets in crossflow at low to medium jet-to-crossflow velocity ratios are computed with a finite volume numerical procedure which utilizes a second-moment closure model to approximate the Reynolds stresses. A multigrid method is used to accelerate the convergence rate of the procedure. Comparison of the computations to measured data show good qualitative agreement. All trends are correctly predicted, though there is some uncertainty on the height of penetration of the jet. The evolution of the vorticity field is used to explore the jet-crossflow interaction. Demuren, A. O. Glenn Research Center NASA ORDER C-99066-G...
Numerical Simulation Of Complex Three Dimensional Turbulent Free Jets
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Author : Robert V. Wilson
language : en
Publisher:
Release Date : 1996
Numerical Simulation Of Complex Three Dimensional Turbulent Free Jets written by Robert V. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Finite differences categories.
Numerical Simulation Of Turbulent Jets With Rectangular Cross Section
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Author : Robert V. Wilson
language : en
Publisher:
Release Date : 1997
Numerical Simulation Of Turbulent Jets With Rectangular Cross Section written by Robert V. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Three-dimensional turbulent jets with rectangular cross-section are simulated with a finite-difference numerical method. The full Navier-Stokes equations are solved at low Reynolds numbers, whereas at the high Reynolds numbers filtered forms of the equations are solved along with a subgrid scale model to approximate effects of the unresolved scales. A 2-N storage, third-order Runge-Kutta scheme is used for temporal discretization and a fourth-order compact scheme is used for spatial discretization. Computations are performed for different inlet conditions which represent different types of jet forcing. The phenomenon of axis-switching is observed, and it is confirmed that this is based on self-induction of the vorticity field. Budgets of the mean streamwise velocity show that convection is balanced by gradients of the Reynolds stresses and the pressure.
Characteristics Of 3d Turbulent Jets In Crossflow
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Author : A. O. Demuren
language : en
Publisher:
Release Date : 1991
Characteristics Of 3d Turbulent Jets In Crossflow written by A. O. Demuren and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Multigrid methods (Numerical analysis) categories.
Computations Of Complex Three Dimensional Turbulent Free Jets
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-23
Computations Of Complex Three Dimensional Turbulent Free Jets written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-23 with categories.
Three-dimensional, incompressible turbulent jets with rectangular and elliptical cross-sections are simulated with a finite-difference numerical method. The full Navier- Stokes equations are solved at low Reynolds numbers, whereas at high Reynolds numbers filtered forms of the equations are solved along with a sub-grid scale model to approximate the effects of the unresolved scales. A 2-N storage, third-order Runge-Kutta scheme is used for temporary discretization and a fourth-order compact scheme is used for spatial discretization. Although such methods are widely used in the simulation of compressible flows, the lack of an evolution equation for pressure or density presents particular difficulty in incompressible flows. The pressure-velocity coupling must be established indirectly. It is achieved, in this study, through a Poisson equation which is solved by a compact scheme of the same order of accuracy. The numerical formulation is validated and the dispersion and dissipation errors are documented by the solution of a wide range of benchmark problems. Three-dimensional computations are performed for different inlet conditions which model the naturally developing and forced jets. The experimentally observed phenomenon of axis-switching is captured in the numerical simulation, and it is confirmed through flow visualization that this is based on self-induction of the vorticity field. Statistical quantities such as mean velocity, mean pressure, two-point velocity spatial correlations and Reynolds stresses are presented. Detailed budgets of the mean momentum and Reynolds stresses are presented. Detailed budgets of the mean momentum and Reynolds stress equations are presented to aid in the turbulence modeling of complex jets. Simulations of circular jets are used to quantify the effect of the non-uniform curvature of the non-circular jets. Wilson, Robert V. and Demuren, Ayodeji O. Langley Research Center NASA-CR-203976, NAS 1.26:203976, ICAM-97-101 NCC1-232...
Three Dimensional Numerical Simulation Of A Supersonic Under Expanded Rectangular Jet
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Author : Ibraheem M. A. Al-Qadi
language : en
Publisher:
Release Date : 2003
Three Dimensional Numerical Simulation Of A Supersonic Under Expanded Rectangular Jet written by Ibraheem M. A. Al-Qadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Aerodynamic noise categories.
Abstract: A three-dimensional numerical simulation of the unsteady flow in an under-expanded supersonic rectangular jet has been conducted for the purpose of investigating and analyzing the production and propagation of jet noise. The compressible three-dimensional Navier-Stokes equations are solved using high-order spatial and temporal differencing schemes. The solution method applies linear and nonlinear filtering schemes to produce oscillation-free shocks and discontinuities while minimizing dissipation effects in smooth regions. The solution method also applies nonreflecting boundary conditions to minimize reflections. Characteristic boundary conditions are implemented at the upstream and far-field boundaries and an absorbing buffer zone is added at the outflow boundary. OpenMP shared- memory model was utilized to parallelize the simulation and good parallel performance was achieved. The code was used to conduct a time dependent numerical simulation of an under-expanded supersonic rectangular jet. A comprehensive database of the simulation was generated. The results of the simulation were validated against experimental measurements and show very good agreement. The simulation is shown to resolve critical unsteady flow features of the jet such as vortex shedding, shock-cell structure, shock shear-layer interaction, flapping, and axis-switching. Visualization of the unsteady flow and analysis of the turbulent flow-field shows that the location of axis-switching is immediately downstream of the fourth shock. It is also observed that the location of the dominant screech source is at the third shock. Two-point space-time correlations demonstrate that the convection velocities in the jet shear layer are highly modulated by the presence of shock waves. Spectral analysis show that the simulation predicts, with good accuracy, screech modes frequencies, wavelengths, phase, and amplitudes. Analysis inside the jet shear layer and in the acoustic near-field reveal exact correspondence in frequency and phase between the inner and the outer parts of the screech loop. The simulation also predicts the complex pattern of the near acoustic field associated with screech. The current simulation represents the first successful three- dimensional numerical simulation of an under-expanded supersonic rectangular jet. It also represents a significant contribution towards accurate prediction of noise production and far-field radiation in supersonic jets. The computational tools developed in this study can be used to investigate a wide range of problems related to unsteady flows and aeroacoustics.
Numerical Study Of Three Dimensional Turbulent Flows
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Author :
language : en
Publisher:
Release Date : 2001
Numerical Study Of Three Dimensional Turbulent Flows written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Direct numerical and large-eddy simulations were used to perform numerical experiments' relevant to the cases of interest. We employ a plane-channel geometry and impose mean-flow perturbations by subjecung fully developed 2D Poiseuille flow to irrotational deformations andlor in-plane motion of the channel walls. The former corresponds to outer-layer strains induced in boundary layers by pressure gradients, the latter to sudden variations in the near-wall region, caused by either step changes in the surface conditions or the combination of an outer-layer change and the no-slip boundary condition. This combination allows the physics of a broad class of spatially developing wall shear layers to be duplicated with a temporally evolving channel flow. The temporal computations can be realized much more effectively than can simulations of a spatial boundary layer. providing a much more extensive study for a given cost. As a consequence. we can consider a wide variety of mean-flow perturbations. Moreover, since mean statistics for these flows satisfy a one dimensional unsteady problem that contains the essential features of the spatial flow, they provide an effident means of testing on%point dosure models.