CFD analysis of subsea pipelines and risers.

In the master's thesis, an analysis of promising shelf areas in Russia is given for the need to introduce riser systems. The main risers types used in the oil and gas industry are described. The global tasks in work are the study and modelling of cylinder vibrations, the fluid-structure interaction, the combination of hydrodynamic and structural dynamics approaches to investigate the reliability of a marine riser under certain conditions. The study of the dynamic behavior of the riser in the flow has been carried out. The calculation of the loads to which the riser is subjected is presented. The displacement amplitudes and frequency characteristics are analyzed. The work done via the multistrip method to calculate the structural dynamics of the riser based on two-dimensional modelling of the cylinder vortex-induced vibration in the flowing stream. Modal analysis was performed to find the natural frequencies and response frequencies to determine the riser shape