... ABSTRACT Previous studies on the lateral instability of the pipeline seldom paid attention to the detailed breakout process at the pipe-soil interface, where the sliding and the rolling mechanism could be coexistent and competitive. In this study, a series of experiments on the steady flow...

... ABSTRACT The on-bottom stability of a submarine pipeline is a flow-pipe-soil coupling problem. For the integrated pipe-soil system under the action of steady current, two correlated instability modes could be involved, i.e., the lateral-instability of the pipeline and the tunnel-erosion...

... be captured. It is shown that roll instability is caused by the destabilizing hydrodynamic rolling moment overcoming the static righting moment. Relations among maximum roll angle, surfacing velocity fluctuation and current parameters are concluded by comparison with variation trend of submarine motion...

... smagorinsky model simulation reynolds number drag coefficient shear layer instability numerical simulation fluid mech reservoir simulation eddy simulation investigation computational domain upstream oil & gas subcritical regime dynamic sg model vortex LES investigations of flow over...

... ABSTRACT: For these ten years, the author has investigated about unstable phenomena for high-speed planning craft experimentally and theoretically. In this paper, some of the unstable phenomena are introduced. The measured results of the motion of dynamic instabilities are shown...