| An Investigation of flow-induced vibration is presented in this thesis. Three finite elements models for the pipe system were developed: a structural finite element analysis model with multi-support system for frequency analysis, a fluid-structure interaction (FSI) finite element model and a transient flow model for waterhammer induced vibration analysis in a fluid filled pipe. The natural frequencies, static, dynamic and thermal stresses, and the limitation of the pipeline system were investigated. The investigation demonstrates that a gap in a support at the segment k has a negative effect on the entire piping system. It was determined that the first natural frequency of the whole system occurs at 2.07 Hz, and the second at a frequency of 5.65 Hz. Resonance vibration for the first mode shape was found at a flow rate of 40 lbm/s, and resonance vibration for the second mode shape occurs at a flow rate of 275lbm/s. In the warterhammer analysis, the limit maximum flow rates were determinated based on the rate of a rapid closure of the isolation valve. A study of the fluid transient in a simple pipeline was performed. Results obtained from FE model for fluid-structure interaction was compared with a model without considering fluid-structure interaction effects. The results show notable differences in the velocities profile and deformation due to the fluid-structure interaction effects. |
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