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

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Insinööritieteiden korkeakoulu | Master's thesis
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Date

2015-09-21

Department

Major/Subject

Nordic Master in Maritime Engineering

Mcode

ENG3034

Degree programme

Konetekniikan koulutusohjelma

Language

en

Pages

50+22

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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.

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Supervisor

Kujala, Pentti

Thesis advisor

Manderbacka, Teemu

Keywords

shallow water sloshing, transient tank roll motion, 2D, CFD, OpenFOAM

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https://urn.fi/URN:NBN:fi:aalto-201510164731

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