A sharp-interface immersed smoothed point interpolation method with improved mass conservation for fluid-structure interaction problems

Yan, Boqian; Wang, Shuangqiang; Zhang, Gui-yong; Jiang, Chen; Xiao, Qihang; Sun, Zhe

doi:10.1007/s42241-020-0025-1

Cited by 15 publications

(2 citation statements)

References 49 publications

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“…Thirdly, more and more complicated interpolation functions are proposed by many researchers for different purposes, including the piecewise, quadratic, Cosine smooth and so on 5 , 24 . These new interpolation schemes successfully improve computational accuracy in various contexts via advanced high order approximations 6 , 25 . Nevertheless, such advanced schemes are usually computationally expensive and difficult to implement due to its high complexity in algorithm.…”

Section: Introductionmentioning

confidence: 99%

A high-efficiency discretized immersed boundary method for moving boundaries in incompressible flows

Liu

et al. 2023

Sci Rep

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The Immersed Boundary Method (IBM) has an advantage in simulating fluid–structure interaction, owning to its simplicity, intuitiveness, and ease of handling complex object boundaries. The interpolation function plays a vital role in IBM and it is usually computationally intensive. For moving or deforming solids, the interpolation weights of all the immersed boundary points ought to be updated every time step, which takes quite a lot CPU time. Since the interpolation procedure within all uniform structured grids is highly repetitive and very similar, we propose a simple and generalized Discretized Immersed Boundary Method (DIBM), which significantly improves efficiency by discretizing the interpolation functions onto subgrid points within each control volume and reusing a predefined universal interpolation stencil. The accuracy and performance of DIBM are analyzed using both theoretical estimation and simulation tests. The results show speedup ratios of 30–40 or even higher using DIBM when compared with conventional IBM for typical moving boundary simulations like particle-laden flows, while the error is estimated to be under 1% and can be further decreased by using finer subgrid stencils. By balancing the performance and accuracy demands, DIBM provides an efficient alternative framework for handling moving boundaries in incompressible viscous flows.

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Section: Introductionmentioning

confidence: 99%

A high-efficiency discretized immersed boundary method for moving boundaries in incompressible flows

Liu

et al. 2023

Sci Rep

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“…Thus, it is challenging to build the relation for these two meshes to impose the coupling condition(de Tullio and Pascazio, 2016;. Moreover, according toYan et al (2020), the conventional IBM had a major disadvantage for fiber-like immersed structures, e.g.,the cables and nets in the present study, because fiber-liked structures occupy negligible volume in the fluid domain. Thus, a new coupling algorithm is needed to study the effect of nets, which are thin (2 -4 millimeters of twine diameter), flexible and highly permeable structures, on the flow field through and around a large marine aquaculture structure (hundreds of meters) in a computationally affordable way.…”

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confidence: 99%

Development of Advanced Numerical Tools for Dynamic Analysis of Aquaculture Structures

Cheng¹

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Numerical methods to accurately predict dynamic responses of marine aquaculture structures are essential in the engineering design process, because these structures can be subjected to large wave and current loads in the ocean environment, which causes complex structural motion and deformation. However, only a few numerical programs for the dynamic analysis of aquaculture structures can be accessed by the public without permission. In order to meet the high demand for a ready-for-use program, a numerical module for an open-source Finite Element Analysis (FEA) program, Code_Aster, is developed in this PhD study. This numerical module includes various wave models (e.g., Airy waves, Stokes 2nd order waves and irregular waves) and hydrodynamic force models (e.g., Morison model, Screen model and flow velocity reduction due to wake effects). Moreover, a coupling algorithm to handle the wake effects of thin, flexible and highly permeable structures with complex geometries is also implemented to solve the complex fluid-structure interaction (FSI) problem in marine aquaculture engineering. The accuracy of structural response prediction can be improved using the coupling algorithm with the open-source Computational Fluid Dynamics (CFD) solver, OpenFOAM, which can solve the complex flow field around the structures. Detailed verifications and validations are firstly conducted with considerations of different net solidities, inflow angles, incoming current velocities and net dimensions. Subsequently, the newly developed numerical module is applied to study dynamic responses of traditional fish cages, grid moored fish farms and a large semi-submersible aquaculture structure for practical engineering design and optimization purposes. The structural responses of traditional fish cages with different design parameters (including circumferences of floating collar, depths of net bag, submerged weights) are comprehensively analyzed under pure current conditions. Based on the parametric analysis with a large number of numerical simulations, regression functions for the most concerning aspects are provided for engineering usages in the design process. These regression functions can save considerable time for experiments and numerical simulations in the design of traditional fish cages. The structural responses of grid moored fish farms are analyzed with respect to combinations of mooring line breakages and current directions. Based on the numerical results, suggestions to improve the design of the mooring system are given. It is also recommended to monitor the positions of buoys during in-situ operations. When one of the mooring line breaks, the maximum tension increment in the mooring system can be estimated based on the displacement of the buoys. This estimation can help the farmer to decide whether the damaged mooring line should be repaired immediately. The global responses of a semi-submersible offshore aquaculture structure are investigated under irregular waves and current conditions which correspond to a return period of 50 years. The numerical model shows a reasonable agreement with published experimental results and demonstrates that the newly developed numerical module can be applied to the dynamic analysis of offshore aquaculture structures.

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On the development of ice-water-structure interaction

Han

et al. 2020

J Hydrodyn

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A sharp-interface immersed smoothed point interpolation method with improved mass conservation for fluid-structure interaction problems

Cited by 15 publications

References 49 publications

A high-efficiency discretized immersed boundary method for moving boundaries in incompressible flows

A high-efficiency discretized immersed boundary method for moving boundaries in incompressible flows

Development of Advanced Numerical Tools for Dynamic Analysis of Aquaculture Structures

On the development of ice-water-structure interaction

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