that describes the combined effects of nonlinearity and losses on the propagation of progressive waves.

KZK equation

An augmentation to the Burgers equation that accounts for the combined effects of nonlinearity, diffraction, and absorption in directional sound beams is described by the Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation, named after Rem Khokhlov, Evgenia Zabolotskaya, and V. P. Kuznetsov. Solutions to this equation are generally used

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