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research-article

CFD Simulations of Non-Linear Sloshing in a Rotating Rectangular Tank Using The Level Set Method

[+] Author and Article Information
Erlend Liavaag Grotle

Faculty of Marine Technology and Operations, Norwegian University of Science and Technology, Aalesund, Norway
grotle@ntnu.no

Hans Bihs

Marine Civil Engineering, Department of Civil and Transport Engineering, Norwegian University of Science and Technology, Trondheim, Norway
hans.bihs@ntnu.no

Vilmar Æs⊘y

Faculty of Marine Technology and Operations, Norwegian University of Science and Technology, Aalesund, Norway
vilmar.aesoy@ntnu.no

Eilif Pedersen

Department of Marine Technology, Norwegian University of Science and Technology, Trondheim, Norway
eilif.pedersen@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4040560 History: Received August 12, 2016; Revised June 06, 2018

Abstract

In this paper, numerical simulations of non-linear sloshing in rectangular tanks are presented. Model implementations in the open source software REEF3D are tested and results compared with experimental data with three different conditions. The interface location is compared for both linear and non-linear sloshing. The non-linear sloshing is simulated in both 2D and 3D. Video images from the SPHERIC project are compared with simulations for the interface. A condition with lateral wave impacts in sloshing, with a frequency close to the natural frequency of the first mode, can be found in this case. The numerical model is solving the RANS equations with the k??w turbulence model. The level set method is used to capture the interface. Higher order discretization schemes are implemented to handle time-evolution and convective fluxes. A ghost cell method is used to account for solid boundaries and parallel computations. It is found that the limiting factor for the eddy-viscosity has significant influence in the non-linear sloshing cases. As the sloshing becomes more violent, the increased strain at the gas-liquid interface overproduces turbulence energy with unrealistically high damping of the motion. 3D simulations show slightly better comparison than 2D. Due to non-linearities and small damping, the time to reach steady-state may take several cycles. The last case shows promising results for the global motion. As expected, the break up of the liquid surface makes it difficult to resolve each phase. But overall, the numerical model predicts the sloshing motion reasonably well.

Copyright (c) 2018 by ASME
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