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Assessment of uncertainty in the CFD simulation of the wave-induced loads on a vertical cylinder |
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| Institution: | 1. School of Naval Architecture and Ocean Engineering, Dalian University of Technology (DUT), NO-116024, Dalian, China;2. Department of Marine Technology and Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Department of Civil, Environmental and Geomatic Engineering, University College London, London WC1E 6BT, UK;1. Graduate School of Engineering Science, Yokohama National University, 240-8501, Kanagawa, Japan;2. Design Department, Onomichi Dockyard Co., Ltd., Hiroshima, Japan;3. Faculty of Engineering, Yokohama National University, 240-8501, Kanagawa, Japan;4. Hull Rules Development Dept., ClassNK, Tokyo, Japan;1. Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, 430063, China;2. School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan, 430063, China |
| Abstract: | The paper addresses different uncertainty analysis methods commonly used for uncertainty quantification in Computational Fluid Dynamics (CFD) studies and compares a constant Courant–Friedrichs–Lewy (CFL) number based approach for uncertainty estimation to the ITTC recommended grid and time-independent procedures. Four different uncertainty estimation procedures are presented and discussed. To compare their performance and better understand CFD related uncertainty quantification in wave load simulations on offshore structures, the methods are applied to a case study of the wave loads on a fixed vertical cylinder. The numerical or CFD wave tank is generated using the open-source CFD toolkit OpenFOAM. Uncertainty is assessed for the case study using four different uncertainty estimation procedures for verification and later, validation is attempted by comparing the CFD results with experiments. The study concludes that a constant CFL number based uncertainty study provides more stable results and is better suited for uncertainty estimation in CFD than the ITTC recommended individual grid and time step uncertainty study. |
| Keywords: | Uncertainty analysis Simulation convergence Grid convergence index Wave structure interaction Verification and validation OpenFOAM |
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