Partitioned simulation of the interaction between an elastic structure and free surface flow |
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Authors: | Joris Degroote Antonio Souto-Iglesias Wim Van Paepegem Sebastiaan Annerel Peter Bruggeman Jan Vierendeels |
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Affiliation: | 1. Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;2. Naval Architecture Department (ETSIN), Technical University of Madrid (UPM), Avda. Arco de la Victoria s/n, 28040 Madrid, Spain;3. Department of Materials Science and Engineering, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;4. Department of Applied Physics, Eindhoven University of Technology, P.O.-Box 513, 5600 MB Eindhoven, The Netherlands;1. Department of Mechanical Engineering, Vanderbilt University, 2301 Vanderbilt Pl., Nashville, TN 37235-1592, USA;2. School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN 47907-2045, USA;3. Departments of Otolaryngology and Hearing and Speech Sciences, Vanderbilt University Medical Center, 1313 21st Ave. S., Nashville, TN 37232-4480, USA |
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Abstract: | Currently, the interaction between free surface flow and an elastic structure is simulated with monolithic codes which calculate the deformation of the structure and the liquid–gas flow simultaneously. In this work, this interaction is calculated in a partitioned way with a separate flow solver and a separate structural solver using the interface quasi-Newton algorithm with approximation for the inverse of the Jacobian from a least-squares model (IQN-ILS). The interaction between an elastic beam and a sloshing liquid in a rolling tank is calculated and the results agree well with experimental data. Subsequently, the impact of both a rigid cylinder and a flexible composite cylinder on a water surface is simulated to assess the effect of slamming on the components of certain wave-energy converters. The impact pressure on the bottom of the rigid cylinder is nearly twice as high as on the flexible cylinder, which emphasizes the need for fluid–structure interaction calculations in the design process of these wave-energy converters. For both the rolling tank simulations and the impact simulations, grid refinement is performed and the IQN-ILS algorithm requires the same number of iterations on each grid. The simulations on the coarse grid are also executed using Gauss-Seidel coupling iterations with Aitken relaxation which requires significantly more coupling iterations per time step. |
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