On the importance of mooring system parametrisation for accurate floating structure designs |
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| Institution: | 1. Offshore Technology Research Center, Texas A&M University, 3400 TAMU, College Station, TX, USA;2. Instituto Mexicano del Petróleo, Eje Central Norte Lázaro Cárdenas 152, Col. San Bartolo Atepehuacan, Del. Gustavo A. Madero C.P. 07730, México D.F., México;1. National Renewable Energy Centre, CENER, Ciudad de la Innovación 7, 31621 Sarriguren, Navarra, Spain;2. Universidad Politécnica de Madrid, UPM, ETSI Navales, Avd. Arco de la Victoria, 4, Ciudad Universitaria, 28040 Madrid, Spain;3. Institute for Energy Technology, IFE, Instituttveien 18, P.O. Box 40, NO-2007 Kjeller, Norway;1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, China;2. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, China;3. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China;1. Aker Solutions Inc., 3010 Briarpark Dr., Suite 500, Houston, TX 77042, USA;2. Department of Physics and Technology, University of Bergen, Allégaten 55, 5007 Bergen, Norway |
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| Abstract: | This paper analyses the importance of mooring design parametrisation on the dynamic behaviour of mooring loads. An exhaustive sensitivity analysis is performed to evaluate the variability of mooring loads because of inaccuracies in the definition of model inputs, including physical and numerical parameters. Results show a relevant dependence on the length and significance in other parameters, such as the weight together with the hydrodynamic equivalent diameter and the drag forces. An inaccuracy below 1% in the mooring reference length can generate loads of up to twice the design, and an incorrect definition of the weight or the drag coefficient in the mooring design can lead to a design load variability of up to 30%. Stiffness plays a crucial role in snap events, reaching load differences of 19% depending on the stiffness selected.This research is based on a set of numerical models capable of predicting the mooring system response. A dynamic numerical model with two schemes of resolution is implemented and calibrated according to an experimental test campaign. Other sources of results provided by a quasi-static model and commercial software, Sesam (DNV-GL), are incorporated. In general, the dynamic numerical models show a good accuracy with an experimental database composed by a set of 2D prescribed movement tests at the fairlead of the mooring system. |
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| Keywords: | Mooring Experimental Numerical Validation |
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