Numerical modelling of dynamic behavior of subsea pipes subjected to external and internal flow

In recent years, many scientists are focused on dynamic behavior of fluid conveying pipes. This study also includes the dynamics on pipes, supported from two ends and due to both of internal and external flow. In the scope of external flow, the constant-diameter pipe is considered in marine environment covering in different sea motions as still waters, currents, waves, current and wave combinations. The internal flow relating to the fluid through the pipe is assumed as ideal and unsteady flow. The pipe is statically represented as the Euler-Bernoulli beam with different support. The equation of motion on pipe is developed depending on boundary conditions and its numerical analysis is performed by using the Galerkin method. Numerical results of vibration analysis are given in graphical form, some dimensionless terms such as B1, the slenderness, the kinematic viscosity and the wave frequency are newly defined and employed first time solving the mentioned equation. The figures contain the time-displacement and the Morison force-time graphics. In graphs, the effect of new dimensionless parameters, B1, the slenderness, the kinematic viscosity and the wave frequency on the Morison force and amplitude of the pipe are presented.