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• W2912862304 abstract "We present a robust immersed boundary (IB) method for high density ratio multiphase flows that is capable of modeling complex wave-structure interaction (WSI) problems arising in marine and coastal engineering applications. The IB/WSI methodology is enabled by combining the distributed Lagrange multiplier (DLM) method of Sharma and Patankar (J Comp Phys, 2005) with a robust level set method based multiphase flow solver. The fluid solver integrates the conservative form of the variable-coefficient incompressible Navier-Stokes equations using a hybrid preconditioner and ensures consistent transport of mass and momentum at a discrete level. The consistent transport scheme preserves the numerical stability of the method in the presence of large density ratios found in problems involving air, water, and an immersed structure. The air-water interface is captured by the level set method on an Eulerian grid, whereas the free-surface piercing immersed structure is represented on a Lagrangian mesh. The fluid-structure interaction (FSI) coupling is mediated via Peskin's regularized delta functions in an implicit manner, which obviates the need to integrate the hydrodynamic stress tensor on the complex surface of the immersed structure. The IB/WSI numerical scheme is implemented within an adaptive mesh refinement (AMR) framework, in which the Lagrangian structure and the air-water interface are embedded on the finest mesh level to capture the thin boundary layers and the vortical structures arising from WSI. We use a well-balanced force discretization for gravity force that eliminates spurious velocity currents in the hydrostatic limit due to density variation in the three phases (air, water and solid). An effective wave generation and absorption technique for a numerical wave tank is presented and used to simulate a benchmark case of water wave distortion due to a submerged structure." @default.
• W2912862304 created "2019-02-21" @default.
• W2912862304 creator A5049052304 @default.
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• W2912862304 date "2019-12-01" @default.
• W2912862304 modified "2023-10-09" @default.
• W2912862304 title "A DLM immersed boundary method based wave-structure interaction solver for high density ratio multiphase flows" @default.
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• W2912862304 doi "https://doi.org/10.1016/j.jcp.2019.07.004" @default.
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