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Models of Nonlinear Acoustics Viewed as Approximations of the Kuznetsov Equation

We relate together different models of non linear acoustic in thermo-ellastic media as the Kuznetsov equation, the Westervelt equation, the Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation and the Nonlinear Progressive wave Equation (NPE) and estimate the time during which the solutions of these models keep closed in the L 2 norm. The KZK and NPE equations are considered as paraxial approximations of the Kuznetsov equation. The Westervelt equation is obtained as a nonlinear approximation of the Kuznetsov equation. Aiming to compare the solutions of the exact and approximated systems in found approximation domains the well-posedness results (for the Kuznetsov equation in a half-space with periodic in time initial and boundary data) are obtained.

preprint2020arXivOpen access
Adrien DekkersVladimir KhodygoAnna Rozanova-Pierrat
math.AP
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Adrien DekkersVladimir KhodygoAnna Rozanova-Pierrat

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