Author: Robert V. WilsonPublisher:
ISBN:
Category : Navier-Stokes equations
Languages : en
Pages : 26
Book Description
Numerical Simulation of Turbulent Jets with Rectangular Cross-section
Author: Robert V. WilsonPublisher:
ISBN:
Category : Navier-Stokes equations
Languages : en
Pages : 26
Book Description
Numerical Simulation of Turbulent Jets with Rectangular Cross-Section
Author: Robert V. WilsonPublisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
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.
Numerical Simulation of Complex, Three-dimensional, Turbulent Free Jets
Author: Robert V. WilsonPublisher:
ISBN:
Category : Finite differences
Languages : en
Pages : 388
Book Description
Direct Numerical Simulations and Modeling of Jets in Crossflow
Author: Suman MuppidiComputations of Complex Three-Dimensional Turbulent Free Jets
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781723544934
Category :
Languages : en
Pages : 218
Book Description
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...
Numerical Simulations of Multiphase Turbulent Jets
Author: Thomas Gabriel AlmeidaPublisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 192
Book Description
Turbulent Jets and Plumes
Author: Joseph Hun-wei LeePublisher: Springer Science & Business Media
ISBN: 9781402075209
Category : Mathematics
Languages : en
Pages : 408
Book Description
CD-ROM contains: an interactive PC-based virtual-reality modelling software (VISJET 2.0 limited version).
Mathematical Modelling and Numerical Simulations of Chemically Reacting Turbulent Jets
Author: Kian MehravaranPublisher:
ISBN:
Category : Chemical reactions
Languages : en
Pages : 352
Book Description
Author: J. J. Lienau
Author: S. Obata