By Charles R. Doering

ISBN-10: 0521445574

ISBN-13: 9780521445573

ISBN-10: 052144568X

ISBN-13: 9780521445689

The Navier-Stokes equations are a suite of nonlinear partial differential equations that describe the elemental dynamics of fluid movement. they're utilized normally to difficulties in engineering, geophysics, astrophysics, and atmospheric technology. This publication is an introductory actual and mathematical presentation of the Navier-Stokes equations, concentrating on unresolved questions of the regularity of options in 3 spatial dimensions, and the relation of those concerns to the actual phenomenon of turbulent fluid movement. The target of the publication is to offer a mathematically rigorous research of the Navier-Stokes equations that's available to a broader viewers than simply the subfields of arithmetic to which it has frequently been limited. as a result, effects and strategies from nonlinear useful research are brought as wanted with a watch towards speaking the fundamental principles in the back of the rigorous analyses. This ebook is acceptable for graduate scholars in lots of components of arithmetic, physics, and engineering.

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**Sample text**

1 . 34) K and the Rayleigh number Ra = agbTh3 pvK 2 . 1 . 35) The Rayleigh number is a measure of the ratio of the driving (the imposed average temperature gradient) to the damping (the viscosity and the thermal diffusion) in the system. A small Rayleigh number indicates a relatively weakly driven, highly constrained system while a large Rayleigh number, with its increased coupling between the temperature and flow fields, allows for more interesting dynamical behavior. The Prandtl number a, the ratio of the viscosity to the thermal diffusion coefficient, is a ratio of material parameters and as such is a characteristic of the fluid itself rather than of the constraints imposed on the flow field.

Solutions of the Navier-Stokes equations at high Reynolds numbers may appear, locally, similar to inviscid flows solving Euler's equations. ' This effect of viscosity is a fundamental source of the difference between solutions of the high Reynolds number Navier-Stokes equations and Euler's equations. The Reynolds number based on the initial data is the relevant dimen- sionless parameter for free decay problems. 12) with either periodic or stationary rigid boundaries. Then the only velocity scale is that provided by the initial condition uo(x) = u(x, 0).

This is the classical approach to turbulence theory. The idea is to decompose a turbulent velocity vector field into a mean and a fluctuating part in an attempt to extract the relevant mean physical quantities. The "mean" in this approach may be a time average - appropriate for a steady configuration which, although fluctuating at all times, has well behaved time averaged characteristics - or an ensemble average where the average is over initial conditions in some class. To illustrate this decomposition we will consider only a steady state turbulent flow, assuming that well defined time averages of all quantities exist.

### Applied Analysis of the Navier-Stokes Equations by Charles R. Doering

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