Browse Publications Technical Papers 2019-01-0810
2019-04-02

Simulation Methodology to Study the Effect of Fluid-Structure Interaction on Dynamic Behavior of Flexible Pipes 2019-01-0810

Oil pipes forms a critical component in a propulsion system where its application ranges from turbocharger oil drain pipe, heat exchanger coolant pipes to exhaust gas recirculation & oil feed pipes. Steel and rubber lines are quite commonly used for conveying fluids in a powertrain but owing to its low flexural rigidity, many of its local bending modes falls in lower frequencies which can be easily excited by engine firing frequencies or road load excitations. So, it becomes critical to look for the dynamic responses and stresses on such components making sure the components are safe. But when it comes to the accurate prediction of the system response or stresses on such metal lines involving flow of fluid through it, the system needs to be modelled considering the structure as well as fluid domain. Also, when it comes to the modal content of any structure, the fluid mostly contributes to mass of the overall system shifting the frequencies towards lower side which holds good enough as an assumption only for static fluid. But the dynamic behavior of the system changes based on the velocity of the fluid flowing through the pipe and the curvature of the geometry. Though the fluid-structure interaction involves many different complex phenomena which can affect the dynamics of the system, this paper discusses an approach based on co-simulation of fluid-structure interaction using finite element package to capture the flow velocity and pipe curvature effects. Moreover, some results showing the effects of fluid flow velocities and the pipe curvatures on the frequency spectrum and response of the system are also discussed. The results are also compared with the conventional approach of performing frequency response analyses with and without lumping fluid mass as non-structural mass.

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