Author: Robert G. DeisslerPublisher:
ISBN:
Category : Heat
Languages : en
Pages : 34
Book Description
Nonlinear Decay of a Disturbance in an Unbounded Viscous Fluid
Author: Robert G. DeisslerPublisher:
ISBN:
Category : Heat
Languages : en
Pages : 34
Book Description
Nonlinear Evolution of a Disturbance in an Unbounded Viscous Fluid with Uniform Shear
Author: Robert G. DeisslerPublisher:
ISBN:
Category : Shear flow
Languages : en
Pages : 28
Book Description
The evolution of a disturbance in the presence of a uniform mean velocity gradient is calculated by a power-series solution of the incompressible Navier-Stokes equations. Terms through those in time cubed are retained in the solution. For the initial condition a three-dimensional cosine distribution with two harmonic terms is assumed. The nonlinear interaction of these harmonic terms produces new harmonics which in turn interact. For large velocity gradients the energy of the disturbance can grow with time. The results shed some light on the maintenance or growth of turbulence in a shear flow.
Turbulent Fluid Motion
Author: R. DeisslerPublisher: CRC Press
ISBN: 1000158659
Category : Technology & Engineering
Languages : en
Pages : 372
Book Description
This comprehensive book is based on the Navier-Stokes and other continuum equations for fluids. It interprets the analytical and numerical solutions of the equations of fluid motion. Topics included are turbulence, and how, why, and where it occurs; mathematical apparatus used for the representation and study of turbulence; continuum equations used for the analysis of turbulence; ensemble, time, and space averages as they are applied to turbulent quantities; the closure problem of the averaged equations and possible closure schemes; Fourier analysis and the spectral form of the continuum equations, both averaged and unaveraged; nonlinear dynamics and chaos theory.
NASA Technical Note
Author: Decay of Homogeneous Turbulence from a Specified State
Author: Robert G. DeisslerPublisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 36
Book Description
The homogeneous turbulence problem is formulated by first specifying the multipoint velocity correlations or their spectral equivalents at an initial time. Those quantities, together with the correlation or spectral equations, are then used to calculate initial time derivatives of correlations or spectra. The derivatives in turn are used in time series to calculate the evolution of turbulence quantities with time. When the problem is treated in this way, the correlation equations are closed by the initial specification of the turbulence and no closure assumption is necessary. An exponential series which is an iterative solution of the Navier stokes equations gave much better results than a Taylor power series when used with the limited available initial data. In general, the agreement between theory and experiment was good.
Scientific and Technical Aerospace Reports
Author: Applied Mechanics Reviews
Author: NASA Scientific and Technical Reports
Author: United States. National Aeronautics and Space Administration Scientific and Technical Information DivisionPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 966
Book Description
A Selected Listing of NASA Scientific and Technical Reports
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information DivisionPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 964
Book Description
NASA Scientific and Technical Reports and Publications for 1969 - A Selected Listing
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information DivisionPublisher:
ISBN:
Category : Science
Languages : en
Pages : 956
Book Description