Abstract
This paper uses the theory of planar dynamic systems and the knowledge of reaction-diffusion equations, and then studies the bounded traveling wave solution of the generalized Boussinesq equation affected by dissipation and the influence of dissipation on solitary waves. The dynamic system corresponding to the traveling wave solution of the equation is qualitatively analyzed in detail. The influence of the dissipation coefficient on the solution behavior of the bounded traveling wave is studied, and the critical values that can describe the magnitude of the dissipation effect are, respectively, found for the two cases of b3 < 0 and b3 > 0 in the equation. The results show that, when the dissipation effect is significant (i.e., r is greater than the critical value in a certain situation), the traveling wave solution to the generalized Boussinesq equation appears as a kink-shaped solitary wave solution; when the dissipation effect is small (i.e., r is smaller than the critical value in a certain situation), the traveling wave solution to the equation appears as the oscillation attenuation solution. By using the hypothesis undetermined method, all possible solitary wave solutions to the equation when there is no dissipation effect (i.e., r = 0) and the partial kink-shaped solitary wave solution when the dissipation effect is significant are obtained; in particular, when the dissipation effect is small, an approximate solution of the oscillation attenuation solution can be achieved. This paper is further based on the idea of the homogenization principles. By establishing an integral equation reflecting the relationship between the approximate solution of the oscillation attenuation solution and the exact solution obtained in the paper, and by investigating the asymptotic behavior of the solution at infinity, the error estimate between the approximate solution of the oscillation attenuation solution and the exact solution is obtained, which is an infinitesimal amount that decays exponentially. The influence of the dissipation coefficient on the amplitude, frequency, period, and energy of the bounded traveling wave solution of the equation is also discussed.
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Citation: ZHANG, W. G., HONG, S. Y., LING, X. Q., and LI, W. X. Influence of dissipation on solitary wave solution to generalized Boussinesq equation. Applied Mathematics and Mechanics (English Edition), 44(3), 477–498 (2023) https://doi.org/10.1007/s10483-023-2954-8
Project supported by the National Natural Science Foundation of China (No. 11471215)
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Zhang, W., Hong, S., Ling, X. et al. Influence of dissipation on solitary wave solution to generalized Boussinesq equation. Appl. Math. Mech.-Engl. Ed. 44, 477–498 (2023). https://doi.org/10.1007/s10483-023-2954-8
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DOI: https://doi.org/10.1007/s10483-023-2954-8
Key words
- generalized Boussinesq equation
- influence of dissipation
- qualitative analysis
- solitary wave solution
- oscillation attenuation solution
- error estimation