Download PDF by Krzysztof Murawski: Analytical and numerical methods for wave propagation in

By Krzysztof Murawski

ISBN-10: 9812381554

ISBN-13: 9789812381552

Mathematical aesthetics isn't really frequently mentioned as a separate self-discipline, although it is cheap to think that the principles of physics lie in mathematical aesthetics. This publication provides a listing of mathematical ideas that may be labeled as "aesthetic" and exhibits that those rules might be forged right into a nonlinear set of equations. Then, with this minimum enter, the ebook exhibits that you can receive lattice suggestions, soliton structures, closed strings, instantons and chaotic-looking platforms in addition to multi-wave-packet ideas as output. those ideas have the typical characteristic of being nonintegrable, ie. the result of integration depend upon the mixing course. the subject of nonintegrable platforms is mentioned Ch. 1. advent -- Ch. 2. Mathematical description of fluids -- Ch. three. Linear waves -- Ch. four. version equations for weakly nonlinear waves -- Ch. five. Analytical equipment for fixing the classical version wave equations -- Ch. 6. Numerical tools for a scalar hyperbolic equations -- Ch. 7. overview of numerical tools for version wave equations -- Ch. eight. Numerical schemes for a procedure of one-dimensional hyperbolic equations -- Ch. nine. A hyperbolic procedure of two-dimensional equations -- Ch. 10. Numerical tools for the MHD equations -- Ch. eleven. Numerical experiments -- Ch. 12. precis of the booklet

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Extra resources for Analytical and numerical methods for wave propagation in fluid media

Example text

42) where A is the area of a crossection of the cylinder, a is the unperturbed radius, h thickness of a cylinder wall, gm mass density of a cylinder material, E Young's modulus, v fluid velocity, QQ = const fluid mass density, and p pressure. The symbols t and x denote time and distance along the cylinder axis, respectively. The cylinder introduces the characteristic spatial scale into the system. This scale is equal to the unperturbed radius a. As a consequence of this scale we expect waves to be dispersive.

So, we perform the following coordinate stretching (e. 10) where s measures the weakness of nonlinearity and s = 1 (s — — 1) corresponds to up-going (down-going) (along the z-direction) propagating waves. 48 Model equations for weakly nonlinear waves In the development that follows we keep s arbitrary, although we will later take s = 1, for upwards propagation. Next, we expand the perturbed plasma quantities in powers of e 1 ' 2 , m,r) = /o + £ 1 / 2 / i ( £ , r ) + e/ 2 (£,r) 4- e 3 / 2 / 3 (£,r) + • • •.

Fig. 3 illustrates that for cr = 2 the real and imaginary parts of the frequency shifts are positive and the sound waves are accelerated and amplified by the wave noise. At the place when the phase speed of the wave noise equals the sound wave speed a resonance occurs. Fig. 4 shows this resonance for K — 2. Note that the resonance is of the l/c r -type; for c r = 1~ (c r = 1 + ) the 44 Linear waves real and imaginary parts of the frequency shift are negative (positive) and the sound waves are decelerated and attenuated (accelerated and amplified) there.

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Analytical and numerical methods for wave propagation in fluid media by Krzysztof Murawski


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