Flexible cylinders, such as marine risers, often experience sustained vortex-induced vibrations (VIVs). Installing helical strakes on a riser is the most widely used technique to mitigate VIVs. This study was inspired by giant Saguaro Cacti which can withstand strong wind with shallow root system. In this study, numerical simulations of flow past stationary cylinder cactus-shaped cross-section ...

When an unsmooth flexible tube rotates, rich tones are produced. We propose a physical model that simulates this behavior. The tube is modeled as an open-ended organ pipe blown by an air stream pumped by a rotationally induced pressure which follows Bernoulli’s principle.

Unbonded post-tensioned (UPT) flat plate concrete slabs are popular for modern continuous multiple bay floor assemblies due to economic and sustainability benefits (reductions in slab thickness and building selfweight) and structural advantages (decreased deflections over larger spans). Only limited research has been conducted on the performance of UPT flat plate slabs under fire conditions, ye...

We report novel flexible thermal ground planes (FTGPs) based on heat pipe technology. FTGP’s effective thermal conductivities are much higher than those of copper and graphite heat spreaders’. We report mylaraluminum, copper-Kapton, and all-polymer FTGP prototypes and advanced technologies which will further enable high-performance FTGPs.

Metallic strip flexible pipes (MSFP), a relatively new style of unbonded pipes, are considered as an attractive alternative to traditional submarine pipes. During its reeling operation, it will inevitably confront various complicated loads, which may affect the integrity and safety MSFP's utilization. In this paper, tension-extension moment-curvature relation MSFP were obtained by laboratorial ...

This paper focuses on a theoretical approach to access the fatigue life of flexible pipes. This methodology employs functions that convert forces and moments obtained in time-domain global analyses into stresses in their tensile armors. The stresses are then processed by well-known cycle counting methods, and S-N curves are used to evaluate the fatigue damage at several points in the pipe’s cro...