Modal characteristics of a flexible cylinder in turbulent axial flow from numerical simulations |
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| Affiliation: | 1. Department of Flow, Heat and Combustion Mechanics, Faculty of Engineering and Architecture, Ghent University, Ghent, Belgium;2. Belgian Nuclear Research Centre, Mol, Belgium;1. Nuclear Research and Consultancy Group (NRG), P.O. Box 25, 1755 ZG Petten, The Netherlands;2. Massachusetts Institute of Technology (MIT), United States;1. Nuclear Research and Consultancy Group NRG, Petten, The Netherlands;2. Delft University of Technology, Delft, The Netherlands;1. Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;2. Department of Radiation Science and Technology, Delft University of Technology, Mekelweg 15, 2629JB Delft, the Netherlands;3. Flanders Make, Belgium;1. Department of Nuclear Engineering, School of Mechanical Engineering, Shiraz University, 71936-16548 Shiraz, Iran;2. Research School of Radiation Applications, Nuclear Science and Technology Research Institute, P. O. Box 11365-3486, Tehran, Islamic Republic of Iran |
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| Abstract: | In this paper the vibration behavior of a flexible cylinder subjected to an axial flow is investigated numerically. Therefore a methodology is constructed, which relies entirely on fluid–structure interaction calculations. Consequently, no force coefficients are necessary for the numerical simulations. Two different cases are studied. The first case is a brass cylinder vibrating in an axial water flow. This calculation is compared to experiments in literature and the results agree well. The second case is a hollow steel tube, subjected to liquid lead–bismuth flow. Different flow boundary conditions are tested on this case. Each type of boundary conditions leads to a different confinement and results in different eigenfrequencies and modal damping ratios. Wherever appropriate, a comparison has been made with an existing theory. Generally, this linear theory and the simulations in this paper agree well on the frequency of a mode. With respect to damping, the agreement is highly dependent on the correlation used for the normal friction coefficients in the linear theory. |
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| Keywords: | Flow-induced vibrations Fluid–structure interaction Eigenmode |
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