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

By Krzysztof Murawski

ISBN-10: 9812381554

ISBN-13: 9789812381552

Mathematical aesthetics isn't often mentioned as a separate self-discipline, although it is cheap to feel that the rules of physics lie in mathematical aesthetics. This booklet offers a listing of mathematical ideas that may be categorised as "aesthetic" and indicates that those ideas may be solid right into a nonlinear set of equations. Then, with this minimum enter, the booklet indicates that you could receive lattice strategies, soliton platforms, closed strings, instantons and chaotic-looking platforms in addition to multi-wave-packet suggestions as output. those recommendations have the typical function of being nonintegrable, ie. the result of integration depend upon the combination course. the subject of nonintegrable structures 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 tools for fixing the classical version wave equations -- Ch. 6. Numerical equipment for a scalar hyperbolic equations -- Ch. 7. evaluate of numerical equipment for version wave equations -- Ch. eight. Numerical schemes for a procedure of one-dimensional hyperbolic equations -- Ch. nine. A hyperbolic method of two-dimensional equations -- Ch. 10. Numerical equipment for the MHD equations -- Ch. eleven. Numerical experiments -- Ch. 12. precis of the booklet

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As a consequence of the presence of a random field we use the following expansion: v(x, t) = < v(x, t) > +v'(x, t), = 0. 50) Here < v > and v' have the meaning of the coherent and random fields (e. , Ostashev 1994), respectively. Substituting this expansion into Eq. 49), using a weak random field approximation (e. 52) 2 > /'Q Q. 53) From Eq. 51) it follows that random sound waves are no longer dispersionless. Indeed, in the forthcoming part of the monograph we will find that as a result of interaction between random mass density field and the sound wave the latter can gain or loose energy and be slowed down or speeded up.

Waves in inhomogeneous fluids 35 We discuss now linear perturbations of the equilibrium of Eq. 29). 38) ^)vz. 39) w - c28kl)A = (g2kl - c ^ 2 A , 2 + g(^ These equations describe sound waves, gravity waves and instability or convection. Evaluating vz from Eq. 38), we obtain A,„+f(logc2),, + iJA,, + r -2-c^ 2 / /•„, _ 11„\ • £ M f ( l o g c ^ - ( 7 - 1 ) 5 J A = 0. 40) We can eliminate the first-order derivative term by transformation u = c2syfaA. 41) Then Eq. 42) where ua is the stratified generalization of the acoustic cut-off frequency, w0, o£ = (l + 2 f f , , K .

As a consequence of that we claim that for c r = — 2 the sound waves are accelerated and attenuated for all K. 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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