TY - JOUR AU - Ransley, Edward J. AU - Brown, Scott A. AU - Hann, Martyn AU - Greaves, Deborah M. AU - Windt, Christian AU - Ringwood, John AU - Davidson, Joshua Patrick AU - Schmitt, Pal AU - Yan, Shiqiang AU - Wang, Junxian X. AU - Wang, Jinghua H. AU - Ma, Qingwei AU - Xie, Zhihua AU - Giorgi, Giuseppe AU - Hughes, Jack AU - Williams, Alison AU - Masters, Ian AU - Lin, Zaibin AU - Chen, Hao AU - Qian, Ling AU - Ma, Zhihua AU - Chen, Qiang AU - Ding, Haoyu AU - Zang, Jun AU - van Rij, Jennifer AU - Yu, Yi-Hsiang AU - Li, Zhaobin AU - Bouscasse, Benjamin AU - Ducrozet, Guillaume AU - Bingham, Harry TI - Focused wave interactions with floating structures: a blind comparative study JF - PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-ENGINEERING AND COMPUTATIONAL MECHANICS J2 - P I CIVIL ENG-ENG COMPUT MECH VL - 174 PY - 2021 IS - 1 SP - 46 EP - 61 PG - 16 SN - 1755-0777 DO - 10.1680/jencm.20.00006 UR - https://m2.mtmt.hu/api/publication/32406784 ID - 32406784 AB - YThe paper presents results from the Collaborative Computational Project in Wave Structure Interaction (CCP-WSI) Blind Test Series 2. Without prior access to the physical data, participants, with numerical methods ranging from low-fidelity linear models to fully non-linear Navier-Stokes (NS) solvers, simulate the interaction between focused wave events and two separate, taut-moored, floating structures: a hemispherical-bottomed cylinder and a cylinder with a moonpool. The 'blind' numerical predictions for heave, surge, pitch and mooring load, are compared against physical measurements. Dynamic time warping is used to quantify the predictive capability of participating methods. In general, NS solvers and hybrid methods give more accurate predictions; however, heave amplitude is predicted reasonably well by all methods; and a WEC-Sim implementation, with CFD-informed viscous terms, demonstrates comparable predictive capability to even the stronger NS solvers. Large variations in the solutions are observed (even among similar methods), highlighting a need for standardisation in the numerical modelling of WSI problems. LA - English DB - MTMT ER - TY - JOUR AU - Ransley, Edward AU - Yan, Shiqiang AU - Brown, Scott AU - Hann, Martyn AU - Graham, David AU - Windt, Christian AU - Schmitt, Pal AU - Davidson, Joshua Patrick AU - Ringwood, John AU - Musiedlak, Pierre-Henri AU - Wang, Jinghua AU - Wang, Junxian AU - Ma, Qingwei AU - Xie, Zhihua AU - Zhang, Ningbo AU - Zheng, Xing AU - Giorgi, Giuseppe AU - Chen, Hao AU - Lin, Zaibin AU - Qian, Ling AU - Ma, Zhihua AU - Bai, Wei AU - Chen, Qiang AU - Zang, Jun AU - Ding, Haoyu AU - Cheng, Lin AU - Zheng, Jinhai AU - Gu, Hanbin AU - Gong, Xiwu AU - Liu, Zhenghao AU - Zhuang, Yuan AU - Wan, Decheng AU - Bingham, Harry AU - Greaves, Deborah TI - A Blind Comparative Study of Focused Wave Interactions with Floating Structures (CCP-WSI Blind Test Series 3) JF - INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING J2 - INT J OFFSHORE POLAR VL - 30 PY - 2020 IS - 1 SP - 1 EP - 10 PG - 10 SN - 1053-5381 DO - 10.17736/ijope.2020.jc774 UR - https://m2.mtmt.hu/api/publication/31493004 ID - 31493004 AB - Results from the CCP-WSI Blind Test Series 3 are presented. Participants, with numerical methods, ranging from low-fidelity linear models to high-fidelity Navier-Stokes (NS) solvers, simulate the interaction between focused waves and floating structures without prior access to the physical data. The waves are crest-focused NewWaves with various crest heights. Two structures are considered: a hemispherical-bottomed buoy and a truncated cylinder with a moon-pool; both are taut-moored with one linear spring mooring. To assess the predictive capability of each method, numerical results for heave, surge, pitch, and mooring load are compared against corresponding physical data. In general, the NS solvers appear to predict the behaviour of the structures better than the linearised methods, but there is considerable variation in the results (even between similar methods). Recommendations are made for future comparative studies and development of numerical modelling standards. LA - English DB - MTMT ER - TY - JOUR AU - Windt, Christian AU - Ringwood, John V AU - Davidson, Joshua Patrick AU - Schmitt, Pal TI - CCP-WSI Blind Test Series 3: CFD-Based Numerical Wave Tank Experiments Employing an Impulse Source Wave Maker JF - INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING J2 - INT J OFFSHORE POLAR VL - 30 PY - 2020 IS - 1 SP - 28 EP - 35 PG - 8 SN - 1053-5381 DO - 10.17736/ijope.2020.jc775 UR - https://m2.mtmt.hu/api/publication/31491414 ID - 31491414 AB - During the development and optimisation of wave energy converters, numerical wave tanks are useful tools, providing detailed insight into the hydrodynamic performance of devices. Specifically, computational fluid dynamics (CFD)-based numerical wave tanks (CNWTs) can deliver high-fidelity, high-resolution results for a wide range of test conditions. However, CNWTs come at significant computational cost and require more man-hours during model setup, compared to lower-fidelity, frequency domain-based models. The computational costs can only be significantly decreased by improving the numerical solvers or by increasing expenditure on computational power. The required man-hours for the model setup, however, can be reduced by streamlining the setup of CNWTs. To this end, the formulation of best-practice guidelines can expedite this streamlining. A step toward such best-practice guidelines is blind tests. This paper presents the CNWT used for the authors' contribution to the Collaborative Computational Project in Wave-Structure Interaction (CCP-WSI) Blind Test Series 3. In the employed numerical wave tanks, a self-calibrating impulse source wave maker is implemented for wave generation. In addition to the numerical results, and the comparison with the recently disclosed experimental data, the paper presents the spatial and temporal convergence studies, as well as results for the numerical wave maker calibration. The numerical results show average deviations with the experimental data of less than 10%. Furthermore, a correlation between the accuracy of the numerical replication of the wave and the agreement between numerical and experimental device motion is highlighted. LA - English DB - MTMT ER - TY - JOUR AU - Windt, Christian AU - Davidson, Joshua Patrick AU - Schmitt, Pal AU - Ringwood, John V TI - Wave-structure interaction of wave energy converters: a sensitivity analysis JF - PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-ENGINEERING AND COMPUTATIONAL MECHANICS J2 - P I CIVIL ENG-ENG COMPUT MECH VL - 173 PY - 2020 IS - 3 SP - 144 EP - 158 PG - 15 SN - 1755-0777 DO - 10.1680/jencm.19.00033 UR - https://m2.mtmt.hu/api/publication/31737915 ID - 31737915 AB - Measurement uncertainties are inevitable during physical wave tank tests. Therefore, when validating a numerical wave tank against experiments, knowledge of the uncertainties in the physical experiments, and the sensitivity of the body dynamics to such uncertainties, is crucial. Specifically, the inertial properties, as well as the location of the centre of mass (CoM), which are challenging to measure accurately, can have a significant influence on the system dynamics. On the basis of test cases of the Collaborative Computational Project in Wave Structure Interaction Blind Test Series 2, this paper presents a sensitivity analysis of the agreement between experimental and numerical data sets to the quality of the incident, focused wave, as well as the inertial properties and the location of the CoM. A significant influence on the modelled system dynamics can be observed when changing the system parameters, resulting in a variation of the observed error of up to 80 percentage points for pitch motion. LA - English DB - MTMT ER - TY - JOUR AU - Windt, Christian AU - Davidson, Joshua Patrick AU - Chandar, Dominic D. J. AU - Faedo, Nicolás AU - Ringwood, John V. TI - Evaluation of the overset grid method for control studies of wave energy converters in OpenFOAM numerical wave tanks JF - Journal of Ocean Engineering and Marine Energy J2 - Journal of Ocean Engineering and Marine Energy VL - 5 PY - 2019 IS - 1 SP - 55 EP - 70 PG - 16 SN - 2198-6452 DO - 10.1007/s40722-019-00156-5 UR - https://m2.mtmt.hu/api/publication/31011444 ID - 31011444 N1 - Centre for Ocean Energy Research, Maynooth University, Maynooth, Co. Kildare, Ireland Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Budapest, Hungary School of Mechanical and Aerospace Engineering, Queen’s University Belfast, Belfast, BT7 1NN, United Kingdom Cited By :12 Export Date: 20 June 2022 Correspondence Address: Windt, C.; Centre for Ocean Energy Research, Ireland; email: christian.windt.2017@mumail.ie LA - English DB - MTMT ER - TY - JOUR AU - Windt, Christian AU - Davidson, Joshua Patrick AU - Schmitt, Pál AU - Ringwood, John TI - On the Assessment of Numerical Wave Makers in CFD Simulations JF - JOURNAL OF MARINE SCIENCE AND ENGINEERING J2 - J MAR SCI ENG VL - 7 PY - 2019 IS - 2 PG - 45 SN - 2077-1312 DO - 10.3390/jmse7020047 UR - https://m2.mtmt.hu/api/publication/30975744 ID - 30975744 LA - English DB - MTMT ER - TY - JOUR AU - Windt, Christian AU - Davidson, Joshua Patrick AU - Ringwood, John V. TI - High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks JF - RENEWABLE & SUSTAINABLE ENERGY REVIEWS J2 - RENEW SUST ENERG REV VL - 93 PY - 2018 SP - 610 EP - 630 PG - 21 SN - 1364-0321 DO - 10.1016/j.rser.2018.05.020 UR - https://m2.mtmt.hu/api/publication/31869274 ID - 31869274 LA - English DB - MTMT ER -