Numerical investigation for the moment caused by shallow water sloshing under a transient roll motion

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Journal Title
Journal ISSN
Volume Title
Insinööritieteiden korkeakoulu | Master's thesis
Date
2015-09-21
Department
Major/Subject
Nordic Master in Maritime Engineering
Mcode
ENG3034
Degree programme
Konetekniikan koulutusohjelma
Language
en
Pages
50+22
Series
Abstract
This paper aims to study the damping effect of the shallow water sloshing on the rectangular tank under a free decaying roll motion in 2 dimensional condition. OpenFOAM software as a CFD method is applied, and its solver interDyMFoam is used to simulate the sloshing phenomenon and process the data. A good representation of the fluid motion evolution and a sound evaluation of the sloshing moment history are given. My sloshing case is a 2D rectangular tank with the filling ratio of 0.012, starting with an initial heeling angle of 8.151 degrees, and the simulated time span is 7 seconds when the first two impacts have taken place. The obtained simulation sloshing moments are compared with the quasi-static moment, while an image comparison is also conducted between the tank test images and the simulation animation to validate the simulation. The damping effect on the tank is studied in time domain. The sloshing moment does not always dampen the tank motion. And it gradually catches up with the quasi-static moment in term of time, while its amplitude decays along with the tank motion. The simulated water motion is satisfactory in general with limited unphysical phenomena. Understanding and experience of interDyMFoam throughout the usage are shared. Consequently, the thesis offers a both qualitatively and quantitatively good study on the shallow water sloshing in transient excitation motion.
Description
Supervisor
Kujala, Pentti
Thesis advisor
Manderbacka, Teemu
Keywords
shallow water sloshing, transient tank roll motion, 2D, CFD, OpenFOAM
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