Wave Propagation for Axisymmetric Wave Motion in Buried Pipes Conveying Viscous Flowing Fluid

This work investigated the wave propagation characteristics of buried pipes conveying viscous flowing fluid under axisymmetric wave motion, where the coupling pipe–soil and pipe–fluid effects are both taken into account. The fluid was assumed to be viscous, isotropic, and irrotational. The coupled equations of wave motion were obtained based on Love’s thin shell theory. The analytical fluid-dominated (s=1) wave dispersion relations of buried fluid-conveying pipes are given. In addition, studies were carried out to scrutinize the effects of the soil, flow velocity, fluid viscosity, fluid mass density, and pipe geometry on wave propagation of buried fluid-conveying pipes. Results show that the higher fluid velocity can lead to larger phase velocity and smaller wave attenuation in buried pipes. In addition, viscous fluid leads to larger wave attenuation compared with ideal fluid.