Numerical simulation of ship motion fully coupled with sloshing tanks by naoe-FOAM-SJTU solver
ISSN: 0264-4401
Article publication date: 11 July 2019
Issue publication date: 15 October 2019
Abstract
Purpose
The purpose of this paper is to verify the ability of our in-house solver naoe-FOAM-SJTU to solve the problem of exterior fluid field coupled with interior fluid field and discover the coupling effects between exterior field (ship motion) and interior field (sloshing tanks).
Design/methodology/approach
The solving equation is based on Navier–Stokes equation, by comparing two turbulence models [laminar model and Reynolds-averaged Navier–Stocks (RANS)], of which RANS model are chosen to do the simulation. A unified approach is adopted to simulate exterior and interior fields simultaneously, keeping the pressure and velocity the same in external and internal fields. By adding a new function of calculating forces on different patches, the inner sloshing moments and external wave exciting moments can be output.
Findings
The in-house solver naoe-FOAM-SJTU had the ability to simulate this problem and showed well agreement with experimental results. By considering ship motion with and without sloshing, it was figured that with the existence of sloshing tank, the ship natural frequency will be changed. When the two tank fillings are the same, there will be another roll peak appeared, which is natural frequency of sloshing tanks. Considering wave height and different filling influence, the nonlinearity of sloshing in tank may give non-proportional response to ship motion.
Practical implications
With the ability to simulate well, the reality reference in the progress of FPSO or FLNG operation is obtained.
Originality/value
The value of this paper is a fully coupled CFD method which is adopted to solve the coupling effects, showing the ability to do the work well. It gives a referenced detailed information of inner and outer fluid field. Meanwhile, it carried out the impact pressure and damping force around the ship, which indicates the practical information in operations.
Keywords
Acknowledgements
This work is supported by the National Natural Science Foundation of China (51879159, 51490675, 11432009, 51579145), Chang Jiang Scholars Program (T2014099), Shanghai Excellent Academic Leaders Program (17XD1402300), Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning (2013022), Innovative Special Project of Numerical Tank of Ministry of Industry and Information Technology of China(2016-23/09) and Lloyd's Register Foundation for doctoral students, to which the authors are most grateful.
Citation
Zhuang, Y. and Wan, D. (2019), "Numerical simulation of ship motion fully coupled with sloshing tanks by naoe-FOAM-SJTU solver", Engineering Computations, Vol. 36 No. 8, pp. 2787-2810. https://doi.org/10.1108/EC-10-2018-0482
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited