本文基于OpenFOAM，对双体船月池中在不同流速下形成的流体共振进行数值模拟。通过与文献中实验和数值结果的比较，验证了该模型的准确性。数值模拟表明，当傅汝德数Fn＝0.04和0.08时，流速对共振振幅的影响会减小。当Fn＝0.12时，可观察到月池入口附近的速度场与涡流发生显著变化，这导致共振振幅的影响增加。即流速较小时可减小共振振幅，随着流速的增加，月池入口附近区域的流体形态发生显著变化，这种变化会增加对共振振幅的影响。
Numerical simulations for fluid resonance in moonpool formed by twin hulls at current speed are carried out based on OpenFOAM package. The accuracy of the present model can be validated according to the comparison with experimental and numerical results in the literature. Numerical simulations show that the influence of current speed can decrease the resonant amplitude when the Froude number is Fn = 0.04 and 0.08. When the current speed is up to Fn = 0.12, the significant variation of the flow pattern in the near region of moonpool entrance can be observed. This leads to the increased effect of Fn = 0.12 on wave amplitude. The influence of current can decrease the resonant amplitude when the speed is small. With the increase of current speed, the significant variation of the flow pattern in the near region of moonpool entrance can be observed, leading to the increased effect on resonant amplitude.
2023,45(23): 50-55 收稿日期：2022-12-08
DOI：10.3404/j.issn.1672-7649.2023.23.009
分类号：U661.3
作者简介：孙克帅(1996-),男,硕士研究生,研究方向为波浪与海洋结构物的相互作用
参考文献：
[1] MOLIN B. On the piston and sloshing modes in moonpools[J]. Journal of Fluid Mechanics, 2001, 430: 27–50.
[2] FALTINSEN O M, ROGNEBAKKE O F TIMOKHA A N. Two-dimensional resonant piston-like sloshing in a moonpool[J]. Journal of Fluid Mechanics, 2007, 575: 359–397.
[3] SUN L, EATOCK R, TAYLOR P H. Wave driven free surface motion in the gap between a tanker and an FLNG barge[J]. Applied Ocean Research, 2015, 51: 331–349.
[4] FENG X, BAI W. Wave resonances in a narrow gap between two barges using fully nonlinear numerical simulation[J]. Applied Ocean Research, 2015, 50: 119–129.
[5] SAITOH T, MIAO G, ISHIDA H. Theoretical analysis on appearance condition of fluid resonance in a narrow gap between two modules of very large floating structure[C]//Proceedings of the Third Asia-Pacific Workshop on Marine Hydrodynamics, 2006: 170–175.
[6] IWATA H, SAITOH T, MIAO G. Fluid resonance in narrow gaps of very large floating structure composed of rectangular modules[C]// Proceedings of the Fourth International Conference on Asian and Pacific Coasts, 2007: 815–826.
[7] PERIC M, SWAN C. An experimental study of the wave excitation in the gap between two closely spaced bodies, with implication for LNG offloading[J]. Applied Ocean Research, 2015, 51: 320–330.
[8] LU, L., CHENG, L., TENG, B, et al. Numerical investigation of fluid resonance in two narrow gaps of three identical rectangular structures[J]. Applied Ocean Research, 2010, 32: 177–190.
[9] JIANG S C, BAI W, TANG G Q. Numerical simulation of wave resonance in the narrow gap between two non-identical boxes[J]. Ocean Engineering, 2018, 156: 38–60.
[10] JIANG S C., BAI W, CONG P W, et al. Numerical investigation of wave forces on two side-by-side non-identical boxes in close proximity under wave actions[J]. Marine Structures, 2019, 63: 16–44.
[11] FREDRIKSEN A G, KRISTIANSEN T, FALTINSEN O M. Experimental and numerical investigation of wave resonance in moonpools at low forward speed[J]. Applied Ocean Research, 2014, 47: 28–46.
[12] JIANG S C, CONG P W, SUN L, et al. Numerical investigation of edge configurations on piston-modal resonance in a moonpool induced by heaving excitations[J]. Journal of Hydrodynamics, 2019, 31(4): 682–699.
[13] MORADI N, ZHOU T, CHENG L. Effect of inlet configuration on wave resonance in the narrow gap of two fixed bodies in close proximity[J] Ocean Engineering, 2015, 103: 88–102.
[14] FENG X, BAI W, CHEN X, et al. Numerical investigation of viscous effects on the gap resonance between side-by-side barges[J]. Ocean Engineering, 2017, 145: 44–58.
[15] YAKHOT V, ORSZAG S, THANGAM S, et al. Development of turbulence models for shear flows by a double expansion technique[J]. Physics of Fluids A: Fluid Dynamics, 1992, 4(7): 1510–1520.
[16] HIRT C W, NICHOLS B D. Volume of fluid (VOF) method for the dynamics of free boundaries[J]. Journal of Computational Physics, 1981, 39(1): 201–225.
[17] ISSA R I. Solution of the implicitly discretised fluid flow equations by operator-splitting[J]. Journal of Computational Physics, 1986, 62(1): 40–65.
[18] JASAK H Error analysis and estimation for the finite volume method with applications to fluid flows[D]. Imperial College London, 1996.
[19] RUSCHE H. Computational fluid dynamics of dispersed two-phase flows at high phase fractions[D]. Imperial College London, 2003:270–5257.
