A study on PID controlled self-propulsion and turning simulations based on the URANS CFD free running approach
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In this study, the proportional, integral, and differential control constants for a self-propulsion point search were investigated using free running Computational Fluid Dynamics (CFD) simulations. The experimental data obtained using a 1/100 scale model of KVLCC2 were used to verify the calculation results. A range of initial propeller rotational speeds from 30% to 140% of the self-propulsion point of the experiment was considered. The controller constants were estimated using the trial-and-error and the Ziegler-Nichols methods, and the two results were similar. As a result, a robust numerical result was obtained within a 0.01% difference of the target speed, and a 0.5% difference of the self-propulsion point of the experiment with P and I constants of 180/m and 30 RPS/m, respectively, for a straight-ahead time of 12.5 L/V. Under the straight-ahead condition, a time step of 0.005 L/V was sufficient. However, in the turning simulation, a time step of 0.0025 L/V or less was required. The key findings obtained from this study are believed to provide a practical guideline for self-propulsion and maneuvering simulation using CFD.
Abstract
In this study, the proportional, integral, and differential control constants for a self-propulsion point search were investigated using free running Computational Fluid Dynamics (CFD) simulations. The experimental data obtained using a 1/100 scale model of KVLCC2 were used to verify the calculation results. A range of initial propeller rotational speeds from 30% to 140% of the self-propulsion point of the experiment was considered. The controller constants were estimated using the trial-and-error and the Ziegler-Nichols methods, and the two results were similar. As a result, a robust numerical result was obtained within a 0.01% difference of the target speed, and a 0.5% difference of the self-propulsion point of the experiment with P and I constants of 180/m and 30 RPS/m, respectively, for a straight-ahead time of 12.5 L/V. Under the straight-ahead condition, a time step of 0.005 L/V was sufficient. However, in the turning simulation, a time step of 0.0025 L/V or less was required. The key findings obtained from this study are believed to provide a practical guideline for self-propulsion and maneuvering simulation using CFD.
참고문헌 (21)
- Pablo M. Carrica, "Self-propulsion computations using a speed controller and a discretized propeller with dynamic overset grids", Journal of Marine Science and Technology, 15(4), pp.316~330 (2010), Springer Science and Business Media LLC[DOI]
- Celik, I. B., "Procedure for estimation and reporting of uncertainty due to discretization in CFD applications", J. Fluid Eng, 130(7), pp.078001~078004 (2008)
- Gustin, G., "CFD Automated Self Propulsion Test. Technology and Science for the Ships of the Future", Proceedings of NAV 2018: 19th International Conference on Ship and Maritime Research, pp.753~761 (2018)
- Harmid, S. H., "CFD Simulations of KVLCC2 Maneuvering with Different Propeller Modeling", Verification and Validation of Ship Maneuvering Simulation Method Workshop (2014)
- Hirt, C. W., "Volume of fluid(vof)method for the dynamics of free boundaries", J. Comput. Phys, 39(1), pp.201~225 (1981)
- ITTC, "Practical Guidelines for Ship CFD Application (7.5-03-02-03-01). ITTC –Recommended Procedures and Guidelines", ~ (2011)
- Hrvoje Jasak, "CFD validation and grid sensitivity studies of full scale ship self propulsion", International Journal of Naval Architecture and Ocean Engineering, 11(1), pp.33~43 (2019), 대한조선학회[DOI]
- Kim, D. J., "Experimental investigation on turning characteristics of KVLCC2 tanker in regular waves", Ocean. Eng, 175, pp.197~206 (2019)
- Kim, D., "Free running CFD simulations to investigate ship manoeuvrability in waves", Ocean. Eng, 236 (2021)
- Kim In-Tae, "Estimation of the manoeuvrability of the KVLCC2 in calm water using free running simulation based on CFD", International Journal of Naval Architecture and Ocean Engineering, 13, pp.466~477 (2021), 대한조선학회[DOI]
- 김대정, "Nonlinear URANS model for evaluating course keeping and turning capabilities of a vessel with propulsion system failure in waves", International Journal of Naval Architecture and Ocean Engineering, 14, pp.1~23 (2022), 대한조선학회[DOI]
- Kim, D., "Hydrodynamic analysis of ship manoeuvrability in shallow water using high-fidelity URANS computations", Appl. Ocean Res, 123 (2022)
- Kim, D., "A high-fidelity CFD-based model for the prediction of ship manoeuvrability in currents", Ocean. Eng, 256 (2022)
- Lee Soonhyun, "A numerical study on self-propulsion performance in regular waves and power prediction in irregular waves", International Journal of Naval Architecture and Ocean Engineering, 14, pp.1~18 (2022), 대한조선학회[DOI]
- Norrison, D., "Numerical study of propeller diameter effects for a self-Propelled conventional submarine", Fifth International Symposium on Marine Propulsors SMP’17 (2017)
- Nuutinen, M., "Automated Self-Propulsion Point Search Algorithm for Ship Performance CFD Simulations", Sixth International Symposium on Marine Propulsors, SMP’19 (2019)
- C. M. Rhie, "Numerical study of the turbulent flow past an airfoil with trailing edge separation", AIAA Journal, 21(11), pp.1525~1532 (1983), American Institute of Aeronautics and Astronautics (AIAA)[DOI]
- Siemens, "Simcenter STAR-CCM+ Documentation", ~ (2022)
- Xing, T., "Factors of safety for Richardson extrapolation", J. Fluid Eng, 132, pp.061403~ (2010)
- Yamazaki, R., "On the propulsion theory of ships on still water introduction", Mem. Facul. Eng. Kyushu Univ, 27(4) (1968)
- Ziegler, J. G., "Optimum settings for automatic controllers", Trans. ASME, 64, pp.759~768 (1942)