Simulation of undular bores evolution with damping

• Main Authors: Tiong, W.K., Tay, K.G., Ong, C.T., Chiew, Kangleng
• Format: E-Article
• Language: English
• Published: Watam Press 2017
• Subjects: T Technology (General)
• Online Access: http://ir.unimas.my/id/eprint/16529/1/SIMULATION%20OF%20UNDULAR%20BORES%20EVOLUTION%20WITH%20DAMPING.pdf; http://ir.unimas.my/id/eprint/16529/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85017003976&partnerID=40&md5=c41f783a06edfb25da1dc2cee85883db

Propagation of undular bores with damping is considered in the framework of perturbed extended Korteweg-de Vries (peKdV) equation. Two types of damping terms for the peKdV equation, namely linear and Chezy frictional terms, which describe the turbulent boundary layers in the fluid flow are considered. Solving the peKdV equation numerically using the method of lines shows that under the influence of damping, the lead- ing solitary wave of the undular bores will split from the nonlinear wavetrain, propagates and behaves like an isolated solitary wave. The amplitude of the leading wave will remain the same for some times before it starts to decay again at a larger time. In general the amplitude of the leading wave and the mean level across the undular bore decreases due to the effect of damping.