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 basic dynamics of fluid movement. they're utilized many times to difficulties in engineering, geophysics, astrophysics, and atmospheric technological know-how. This e-book is an introductory actual and mathematical presentation of the Navier-Stokes equations, targeting unresolved questions of the regularity of strategies in 3 spatial dimensions, and the relation of those concerns to the actual phenomenon of turbulent fluid movement. The target of the e-book is to give 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 routinely been constrained. for that reason, effects and methods from nonlinear sensible research are brought as wanted with an eye fixed towards speaking the basic rules in the back of the rigorous analyses. This booklet is suitable for graduate scholars in lots of parts of arithmetic, physics, and engineering.

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**Additional info for Applied Analysis of the Navier-Stokes Equations**

**Example text**

Discuss the nature of the bifurcation at the critical Rayleigh number. 1) is an exact stationary solution of the Navier-Stokes equations corresponding to a fluid sheared between a stationary plate at z = 0 and one moving with speed U in the x-direction at z = h. 5 Imposing periodic conditions on [0, L1] and [0,L21 in the x- and y-directions respectively, reduce the linear stability analysis to ordinary differential equations for the eigenvalue problem. Can you solve them? Set up the nonlinear stability analysis for Couette flow as described in the previous exercise.

Corrections. 4. Although this example has been developed for illustrative purposes with a minimum of fitting parameters (one), it does reproduce some essential features of the conventional wisdom concerning the structure of both the mean and Reynolds stress profiles. Together with logarithmic corrections, the R2 scaling of the turbulent drag is supported by experiments in wall bounded shear flows. 26), however, constitute uncontrolled approximations which do not follow rigorously (or even "formally" or systematically) from the Navier-Stokes equations.

Integrated over a thin shell around Ikl = k in wavenumber space, this density gives the contribution to the kinetic energy in the flow field from motion on the length scale 2ir/k. For the moment let us focus on the 3d case. )I2) d3k = =: I 2L3 f (27r)3 JE(k)dk. 7) Isotropic turbulence means that on average, there is no preferred direction in the flow. Spectra, Kolmogorov's scaling theory, and turbulent length scales 51 The density E(k) is the contribution to the total average kinetic energy per unit mass from each length scale 27c/k and the total is - (IIu112) = f>_2a/L E(k)dk.

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