Small Scale Experiments with Gas-Liquid Slug Flow in Floating Pipes
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Multiphase flow is one of the key issues in the petroleum engineering, especially in the subsea industry. Depending on the gas and liquid flowrates, it can have different flow patterns that create unwanted dynamic forces. For this reason, understanding of interaction between multiphase flow and a structure is crucial. This phenomenon is called two-way coupling, which study an internal flow effect on a structure and a structural deformation effect on the flow. The objective of the thesis is to conduct experiments demonstrating the two-way coupling phenomenon. The generated experimental data are purposed to contribute to the development of a coupled flow-structure simulator. The work includes an experimental study of a floating flexible pipe and a lazy wave riser. To conduct the experiments, a pool with necessary piping was constructed and in addition, the laboratory multiphase mini-loop was modified. The experiments were recorded and then post processed using an image processing tool. The displacements of the pipe and pressure oscillations in the air tank under different flow conditions were measured. Also, frequency spectrum analysis was utilized to find dominant frequencies. In addition to the experimental investigations, simulations on the numerical code that is under development and simulations on the commercial structural analysis package were carried out. The experimental and numerical results are in a good agreement.