Experimental and simulation study of pounding tuned mass damper on jumper flow induced vibration

Subsea jumpers carrying gas-liquid mixed flows can experience flow-induced vibration (FIV), potentially shortening their service life. The pounding tuned mass damper (PTMD), impact at the viscoelastic boundary can be used to dissipate energy. This paper focuses on a rigid m-shaped jumper to evaluate the specific damping effects of PTMD on the jumper under gas-liquid flow. Three PTMD configurations with significant damping effects are tailored based on the natural frequency of the jumper. Vibration tests are carried out to assess the damping effectiveness of each configuration, and the most effective PTMD is selected. Subsequently, the damping efficacy of PTMD on FIV within the jumper under varying flow conditions is investigated using both experimental methods and numerical simulations (VOF and FIS model). The results show that PTMD has obvious damping effects on free vibration and the main frequency and high-frequency jumper vibrations caused by FIV. Subsequent to the installation of PTMD, a substantial reduction in displacement has been observed across all components of the jumper. The suspension span exhibits the most pronounced decrease, exceeding 60%, while the displacement at the elbow joint is reduced by over 40%.