OpenFOAM을 이용한 EOM 기반 2차원 수치 파 생성에 관한 파라메트릭 연구
A Parametric Study on EOM-based 2D Numerical Wave Generation using OpenFOAM
1
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
The consistency of the initially designed waves in the domain is essential for accurate calculation of the added resistance in waves through CFD. In particular, unwanted reflected waves at domain boundaries can cause incorrect numerical solutions due to the superposition with initially designed waves. Euler Overlay Method(EOM) is one of the methods for reducing wave reflections by adding an additional source term to momentum and phase conservation equations, respectively. In this study, we apply the Euler Overlay Method(EOM) to the open-source CFD library, OpenFOAM®, to simulate the accurate free-surface waves in the domain and the parametric study is performed for efficient implementation of Euler Overlay Method(EOM). Considering that the damping efficiency depends on the selection of the overlay parameter in the added source terms, the size of overlay zone and the wave steepness, the influences of these factors are tested through the wave elevation measured at constant time intervals in the 2D numerical wave tank. Through this process, guidelines for selection of optimal overlay parameter and overlay zone size that can be applied according to the scaling law are finally presented.
Abstract
The consistency of the initially designed waves in the domain is essential for accurate calculation of the added resistance in waves through CFD. In particular, unwanted reflected waves at domain boundaries can cause incorrect numerical solutions due to the superposition with initially designed waves. Euler Overlay Method(EOM) is one of the methods for reducing wave reflections by adding an additional source term to momentum and phase conservation equations, respectively. In this study, we apply the Euler Overlay Method(EOM) to the open-source CFD library, OpenFOAM®, to simulate the accurate free-surface waves in the domain and the parametric study is performed for efficient implementation of Euler Overlay Method(EOM). Considering that the damping efficiency depends on the selection of the overlay parameter in the added source terms, the size of overlay zone and the wave steepness, the influences of these factors are tested through the wave elevation measured at constant time intervals in the 2D numerical wave tank. Through this process, guidelines for selection of optimal overlay parameter and overlay zone size that can be applied according to the scaling law are finally presented.
참고문헌 (21)
- Bøckmann, A., "An experimental and computational development of a benchmarksolution for the validation of numerical wave tanks", Proceedings of the ASME 2014 33rd International Conference on Ocean (2014), Offshore and Arctic Engineering
- Fujii, H., "Experimental study on the resistance increase of a ship in regular oblique waves", Proceeding of 14th ITTC (1975)
- Motions, Wave loads and added resistance in waves of two wigley hull forms, "Gerritsma, J.", Technical University of Delft, ~, pp.Technical University of Delft, Netherlands, Report No. 804 (1988)
- Grue, J., "Wave forces on marine structures with small speed in water of restricted depth", Applied Ocean Research, 15, pp.121~135 (1993)
- Issa, R. I., "Solution of the implicitly discretised fluid flow equations by operator-splitting", Journal of Computational Physics, 62, pp.40~65 (1985)
- Jacobsen, N. G., "A wave generation toolbox for the open-source CFD library : OpenFOAM", International Journal for Numerical Methods in Fluids, 70(9), pp.1073~1088 (2012)
- Joncquez, S. A. G., "Validation of added resistance computations by a potential-flow boundary-element method", Proceeding of the 27th Symposium on Naval Hydrodynamics, pp.1461~1470 (2008)
- Experiments and calculations on four wigley hull forms, "Journee, J. M. J.", Delft University of Technology, ~ (1992)
- Prediction of added resistance of a ship in waves using computational fluid dynamics, "Kim, H.", The Korean Association of Ocean Science and Technology Societies, ~ (2015)
- Kim, J., "Numerical wave tank analysis of wave run-up on a truncated vertical cylinder", Proceeding of 30th International Conference on Ocean, Offshore and Arctic Engineering, 1, pp.805~814 (2011)
- Kim, J. W., "Ringing analysis on a vertical cylinder by euler overlay method", Journal of Offshore Mechanics and Arctic Engineering (2012)
- Lee, J., "Experimental investigation on the added resistance of modified KVLCC2 hull forms with different bow shapes", Proceedings of the Institution of Mechanical Engineers. Part M: Journal of Engineering for the Maritime Environment, 231(2), pp.395~410 (2017)
- Liu, S., "Prediction of added resistance of ships in waves", Ocean Engineering, 38, pp.641~650 (2011)
- Nakamura, S., "Propulsive performance of a containership in waves", Journal of the Society of Naval Architecture of Japan, 15, pp.24~48 (1977)
- Orihara, H., "Evaluation of added resistance in regular incident waves by computational fluid dynamics motion simulation using an overlapping grid system", Journal of Marine Science and Technology, 8, pp.47~60 (2003)
- Patankar, S. V., "A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows", International Journal of Heat and Mass Transfer, 15, pp.1787~1806 (1972)
- Perić, R., "Reliable damping of free-surface waves in numerical simulations", Ship Technology Research, 63(1), pp.1~13 (2016)
- Sadat-Hosseini, H., "CFD verification and validation of added resistance and motions of KVLCC2 with fixed and free surge in short and long head waves", Ocean Engineering, 59, pp.240~273 (2013)
- 서성욱, "선수 규칙파 중 KCS의 부가저항 및 운동성능 수치해석", 대한조선학회 논문집, 54(2), pp.132~142 (2017), 대한조선학회[DOI]
- Shen, Z. R., "RANS computations of added resistance and motions of a ship in head waves", International Journal of Offshore and Polar Engineering, 23(4), pp.263~271 (2013)
- Ursell, F., "Forced small-amplitude water waves: a comparison of theory and experiment", Journal of Fluid Mechanics, 7(01), pp.33~52 (1960)