Approximate solution of nonlinear triad interactions of acoustic–gravity waves in cylindrical coordinates

Kadri, Usama ORCID: https://orcid.org/0000-0002-5441-1812 and Wang, Zhan 2021. Approximate solution of nonlinear triad interactions of acoustic–gravity waves in cylindrical coordinates. Communications in Nonlinear Science and Numerical Simulation 93 , 105514. 10.1016/j.cnsns.2020.105514

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Abstract

The three-dimensional radial propagation of wave disturbances over a slightly compressible fluid of constant depth is discussed. We focus on resonant triads comprising two gravity modes and one acoustic mode. The derivation of the evolution equations in a non-integral form is made possible by approximating the radial solution by cosine functions in two regions, inner and outer, that are matched at a location where all relevant derivatives are in agreement with the exact Bessel solution. When the interaction takes place in the inner region of all modes, the amplitude evolution equations are found to be similar to the two-dimensional case. However, focusing of one gravity mode and de-focusing of the other is observed when the interaction involves an inner region of the acoustic mode, and outer regions of the gravity modes.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Mathematics
Publisher:	Elsevier
ISSN:	1007-5704
Date of First Compliant Deposit:	11 September 2020
Date of Acceptance:	1 September 2020
Last Modified:	07 Nov 2023 03:08
URI:	https://orca.cardiff.ac.uk/id/eprint/134766

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