Application of a 2D harmonic polynomial cell (HPC) method to singular flows and lifting problems |
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| Institution: | 1. Centre for Autonomous Marine Operations and Systems (AMOS), Department of Marine Technology, NTNU, NO-7491 Trondheim, Norway;2. School of Naval Architecture Engineering, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, People''s Republic of China;3. Sevan Marine ASA, 0277 Oslo, Norway;1. Department of Water Resources and Environmental Engineering, Tamkang University, New Taipei City 25137, Taiwan, ROC;2. Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan City 701, Taiwan, ROC;1. University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. Dept of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom;1. Institute for Mathematics and Computer Science, University of Groningen, P.O. Box 407, 9700 AK Groningen, The Netherlands;2. MARIN, P.O. Box 28, 6700 AA Wageningen, The Netherlands |
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| Abstract: | Further developments and applications of the 2D harmonic polynomial cell (HPC) method proposed by Shao and Faltinsen 22] are presented. First, a local potential flow solution coupled with the HPC method and based on the domain decomposition strategy is proposed to cope with singular potential flow characteristics at sharp corners fully submerged in a fluid. The results are verified by comparing them with the analytical added mass of a double-wedge in infinite fluid. The effect of the singular potential flow is not dominant for added mass and damping, but the error is non-negligible when calculating mean wave loads using direct pressure integration. Then, the double-layer nodes technique is used to simulate a thin free shear layer shed from lifting bodies, across which the velocity potential is discontinuous. The results are verified by comparing them with analytical results for steady and unsteady lifting problems of a flat plate in infinite fluid. The latter includes the Wagner problem and the Theodorsen functions. Satisfactory agreement with other numerical results is documented for steady linear flow past a foil and beneath the free surface. |
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| Keywords: | HPC Marine hydrodynamics Local solution Domain decomposition Double-layer nodes |
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