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Level set immersed boundary method for coupled simulation of air/water interaction with complex floating structures

Title
Level set immersed boundary method for coupled simulation of air/water interaction with complex floating structures
Other Titles
water interaction with complex floating structures
Author
강석구
Keywords
Fluid–structure interaction; Two-phase free surface flow; Large eddy simulation; Level set method; Immersed boundary method; Floating structures; Falling wedge
Issue Date
2014-11
Publisher
Elsevier Inc.
Citation
Journal of Computational Physics, November 2014, 277, P.201-227
Abstract
We propose a new computational approach for simulating the coupled interaction between air–water flows and arbitrarily complex floating rigid bodies. The numerical method integrates the fluid–structure interaction (FSI) curvilinear immersed boundary (CURVIB) method of Borazjani et al. (2008) [21] with a level set approach for simulating free surface flows in arbitrarily complex domains. We show that when applying the CURVIB method to simulate two-phase flow FSI problems the approach used to calculate the force imparted on the body is critical for determining the overall accuracy of the method. We develop and demonstrate the accuracy of a new approach for calculating the force, namely the pressure projection boundary condition (PPBC), which is based on projecting the pressure on the surface of the body using the momentum equation along the local normal to the body direction. Extensive numerical tests show that the new approach greatly improves the ability of the method to correctly predict the dynamics of the floating structure motion. To demonstrate the predictive capabilities of the method and its ability to simulate non-linear free surface phenomena, such as breaking waves, we apply it to various two- and three-dimensional problems involving complex rigid bodies interacting with a free surface both with prescribed body motion and coupled FSI. We show that for all cases the proposed method yields results in very good accuracy with benchmark numerical data and available experiments. The simulations also reveal the onset of dynamically rich, energetic coherent structures in the air phase induced by the waves generated as the rigid body interacts with the free surface.
URI
https://www.sciencedirect.com/science/article/pii/S0021999114005567http://hdl.handle.net/20.500.11754/53762
ISSN
0021-9991
DOI
10.1016/j.jcp.2014.08.010
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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