유체-구조 상호작용을 고려한 평판 보강판의 슬래밍 응답에 대한 벤치마크 연구
Dac DungTruongabBeom-SeonJangaCarl-ErikJansoncJonas W.RingsbergcYasuhiraYamadadKotaTakamotofYasumiKawamuraeHan-BaekJua
aResearch Institute of Marine Systems Engineering, Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, South Korea
bDepartment of Engineering Mechanics, Nha Trang University, Nha Trang, Viet Nam
cDivision of Marine Technology, Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg, Sweden
dNational Maritime Research Institute, National Institute of Maritime, Port and Aviation Technology, Tokyo, Japan
eDepartment of Systems Design for Ocean-Space, Yokohama National University, Kanagawa, Japan
fDepartment of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
ABSTRACT
이 논문은 해양구조물의 평보강판의 슬래밍 반응에 대한 벤치마크 연구를 제시합니다. 목표는 유체-구조 상호작용(FSI) 시뮬레이션 방법론, 모델링 기술 및 슬래밍 압력 예측에 대한 기존 연구원의 경험을 비교하는 것이었습니다.
수치 FSI 시뮬레이션을 위해 가장 일반적인 상용 소프트웨어 패키지를 사용하는 3개의 연구 그룹(예: LS-Dyna ALE, LS-Dyna ICFD, ANSYS CFX 및 Star-CCM+/ABAQUS)이 이 연구에 참여했습니다.
공개 문헌에서 입수할 수 있는 경량 선박과 같은 바닥 구조의 평평한 강화 알루미늄 판에 대한 습식 낙하 시험 데이터는 FSI 모델링의 검증에 활용되었습니다. 형상 모델 및 재료 속성을 포함한 실험 조건의 요약은 시뮬레이션 전에 참가자에게 배포되었습니다.
충돌 속도와 강판의 강성이 슬래밍 응답에 미치는 영향을 조사하기 위해 해양 설비에 사용되는 실제 치수를 갖는 평판 보강 강판에 대한 매개변수 연구를 수행했습니다. 보강판에 작용하는 전체 수직력에 대한 FE 시뮬레이션 결과와 이러한 힘에 대한 구조적 반응을 참가자로부터 획득하여 분석 및 비교하였다.
앞서 언급한 상용 FSI 소프트웨어 패키지를 사용하여 슬래밍 부하에 대한 신뢰할 수 있고 정확한 예측을 평가했습니다. 또한 FSI 시뮬레이션에서 관찰된 동일한 영구 처짐을 초래하는 등가 정적 슬래밍 압력을 보고하고 분류 표준 DNV에서 제안한 해석 모델 및 슬래밍 압력 계산을 위한 기존 실험 데이터와 비교했습니다.
연구 결과는 등가 하중 모델이 물 충돌 속도와 플레이트 강성에 의존한다는 것을 보여주었습니다. 즉, 등가정압계수는 충돌속도가 증가함에 따라 감소하고 충돌구조가 더 단단해지면 증가한다.
This paper presents a benchmark study on the slamming responses of offshore structures’ flat-stiffened plates. The objective was to compare the fluid-structure interaction (FSI) simulation methodologies, modeling techniques, and established researchers’ experiences in predicting slamming pressure. Three research groups employing the most common commercial software packages for numerical FSI simulations (i.e. LS-Dyna ALE, LS-Dyna ICFD, ANSYS CFX, and Star-CCM+/ABAQUS) participated in this study. Wet drop test data on flat-stiffened aluminum plates of light-ship-like bottom structures available in the open literature was utilized for validation of the FSI modeling. A summary of the experimental conditions including the geometry model and material properties, was distributed to the participants prior to their simulations. A parametric study on flat-stiffened steel plates having actual scantlings used in marine installations was performed to investigate the effect of impact velocity and plate rigidity on slamming response. The FE simulation results for the total vertical forces acting on the stiffened plates and their structural responses to those forces, as obtained from the participants, were analyzed and compared. The reliable and accurate predictions of slamming loads using the aforementioned commercial FSI software packages were evaluated. Additionally, equivalent static slamming pressures resulting in the same permanent deflections, as observed from the FSI simulations, were reported and compared with analytical models proposed by the Classification Standards DNV and existing experimental data for calculation of the slamming pressure. The study results showed that the equivalent load model depends on the water impact velocity and plate rigidity; that is, the equivalent static pressure coefficient decreases with an increase in impact velocity, and increases when impacting structures become stiffer.
Keywords
Benchmark studyEquivalent static pressureFlat-stiffened plateFluid-structure interactionPermanent deflectionSlamming pressure coefficient
References
[1] Von Karman TH. The impact on seaplane floats during landing. Washington, DC: National Advisory Committee for Aeronautics; 1929. Technical note No.: 321.
[2] Wagner VH. Über Stoß- und Gleitvorgange ¨ an der Oberflache ¨ von Flüssigkeiten. Z Angew Math Mech 1932;12(4):193–215.
[3] Chuang SL. Experiments on flat-bottom slamming. J Ship Res 1966;10:10–7.
[4] Chuang SL. Investigation of impact of rigid and elastic bodies with water. Report for Department of the Navy. Washington, DC: United States Department of the
Navy; 1970. Report No.: 3248.
[5] Mori K. Response of the bottom plate of high-speed crafts under impulsive water pressure. J Soc Nav Archit Jpn 1977;142:297–305 [Japanese].
[6] Cheon JS, Jang BS, Yim KH, Lee HSD, Koo BY, Ju HB. A study on slamming pressure on a flat stiffened plate considering fluid–structure interaction. J Mar Sci
Technol 2016;21:309–24.
[7] Truong DD, Jang BS, Ju HB, Han SW. Prediction of slamming pressure considering fluid-structure interaction. Part I: Numerical simulations. Ships Offshore
Struct. https://doi.org/10.1080/17445302.2020.1816732.
[8] Truong DD, Jang BS, Ju HB, Han SW. Prediction of slamming pressure considering fluid-structure interaction. Part II: Derivation of empirical formulations. Mar
Struct. https://doi.org/10.1016/j.marstruc.2019.102700.
[9] Greenhow M, Lin W. Numerical simulation of nonlinear free surface flows generated by wedge entry and wave maker motions. In: Proceedings of the 4th
international conference on numerical ship hydrodynamics, Washington, DC; 1985.
[10] Sun H, Faltinsen OM. Water impact of horizontal circular cylinders and cylindrical shells. Appl Ocean Res 2006;28(5):299–311.
[11] Gingold RA, Monaghan JJ. Smoothed particle hydrodynamics: theory and application to non-spherical stars. Royal Astronomical Society 1977;181:375–89.
[12] Shao S. Incompressible SPH simulation of water entry of a free-falling object. Int J Numer Methods Fluid 2009;59(1):91–115.
[13] Souli M, Ouahsine A, Lewin L. ALE formulation for fluid-structure interaction problems. Comput Methods Appl Mech Eng 2000;190(5):659–75.
[14] Livermore Software Technology Corporation (LSTC). ICFD theory manual incompressible fluid solver in LS-DYNA. Livermore Software Technology Corporation;
[15] Livermore Software Technology Corporation (LSTC). LS-DYNA theoretical manual. Livermore Software Technology Corporation; 2006.
[16] FLOW-3D user’s manual. 2018., version 12.0.
[17] Cd-adapco. STAR-CCM+ User’s manual. 2012., version 7.06.
[18] ANSYS fluent user’s guide. 2015.
[19] ANSYS CFX user’s guide. 2014.
[20] Abaqus user’s manual, version 6.13. SIMULIA; 2013.
[21] Luo HB, Hu J, Guedes Soares C. Numerical simulation of hydroelastic responses of flat stiffened panels under slamming loads. In: Proceedings of the 29th
international conference on ocean, offshore and arctic engineering (OMAE2010); 2010 [Shanghai, China].[22] Yamada Y, Takami T, Oka M. Numerical study on the slamming impact of wedge shaped obstacles considering fluid-structure interaction (FSI). In: Proceedings
of the 22nd international offshore and polar engineering conference (ISOPE2012); 2012 [Rhodes, Greece].
[23] Luo HB, Wang H, Guedes Soares C. Numerical and experimental study of hydrodynamic impact and elastic response of one free-drop wedge with stiffened
panels. Ocean Eng 2012;40:1–14.
[24] Sun H, Wang DY. Experimental and numerical analysis of hydrodynamic impact on stiffened side of three dimensional elastic stiffened plates. Adv Mech Eng
2018;10(4):1–23.
[25] Ma S, Mahfuz H. Finite element simulation of composite ship structures with fluid structure interaction. Ocean Eng 2012;52:52–9.
[26] LSTC. Turek & hron’s FSI benchmark problem. 2012.
[27] Califano A, Brinchmann K. Evaluation of loads during a free-fall lifeboat drop. In: Proceedings of the ASME 32nd international conference on ocean, offshore
and arctic engineering (OMAE2013); 2013 [Nantes, France].
[28] LSTC. 3D fluid elastic body interaction problem. 2014.
[29] Yamada Y, Takamoto K, Nakanishi T, Ma C, Komoriyama Y. Numerical study on the slamming impact of stiffened flat panel using ICFD method – effect of
structural rigidity on the slamming impact. In: Proceedings of the ASME 39th international conference on ocean, offshore and arctic engineering (OMAE2020);
2020 [Florida, USA].
[30] Nicolici S, Bilegan RM. Fluid structure interaction modeling of liquid sloshing phenomena in flexible tanks in flexible tanks. Nucl Eng Des 2013;258:51–6.
[31] DNV. DNV-RP-C205 environmental conditions and environmental loads. Det Norske Veritas; October 2010.
[32] Ahmed YM. Numerical simulation for the free surface flow around a complex ship hull form at different froude numbers. Alex Eng J 2011;50(3):229–35.
[33] Ghadimi P, Feizi Chekab MA, Dashtimanesh A. Numerical simulation of water entry of different arbitrary bow sections. J Nav Architect Mar Eng 2014;11:
117–29.
[34] Park BW, Cho S-R. Simple design formulae for predicting the residual damage of unstiffened and stiffened plates under explosive loadings. Int J Impact Eng
2006;32:1721–36.
[35] Truong DD, Shin HK, Cho S-R. Permanent set evolution of aluminium-alloy plates due to repeated impulsive pressure loadings induced by slamming. J Mar Sci
Technol 2018;23:580–95.
[36] Jones N. Structural impact. first ed. Cambridge, UK: Cambridge University Press; 1989.
[37] Zha Y, Moan T. Ultimate strength of stiffened aluminium panels with predominantly torsional failure modes. Thin-Walled Struct 2001;39:631–48.
[38] Sensharma P, Collette M, Harrington J. Effect of welded properties on aluminum structures. Ship Structure Committee SSC-4 2010.
[39] ABS. Guide for slamming loads and strength assessment for vessels. 2011.
[40] Villavicencio R, Sutherland L, Guedes Soares C. Numerical simulation of transversely impacted, clamped circular aluminium plates. Ships Offshore Struct 2012;7(1):31–45.
[41] Material properties database. https://www.varmintal.com/aengr.htm, Assessed date: 16 May 2020.
[42] Ringsberg JW, Andri´c J, Heggelund SE, Homma N, Huang YT, Jang BS, et al. Report of the ISSC technical committee II.1 on quasi-static response. In:
Kaminski ML, Rigo P, editors. Proceedings of the 20th international ship and offshore structures congress (ISSC 2018), vol. 1. IOS Press BV; 2018. p. 226–31.
[43] Shin HK, Kim S-C, Cho S-R. Experimental investigations on slamming impacts by drop tests. J Soc Nav Archit Korea 2010;47(3):410–20 [Korean].
[44] Huera-Huarte FJ, Jeon D, Gharib M. Experimental investigation of water slamming loads on panels. Ocean Eng 2011;38:1347–55.
