A subcycling/non-subcycling time advancement scheme-based DLM immersed boundary method framework for solving single and multiphase fluid–structure interaction problems on dynamically adaptive grids

Zeng, Yadong; Bhalla, Amneet Pal Singh; Shen, Lian

doi:10.1016/j.compfluid.2022.105358

Cited by 10 publications

(2 citation statements)

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“…2020; Sharma & García-Mayoral 2020 a ; He et al. 2022; Zeng, Bhalla & Shen 2022). Hence, by resolving the stems in the canopy with the IB method, the drag on the stems can be obtained directly; i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, new simulation approaches that explicitly resolve the flow-canopy interaction are desirable. For instance, the immersed boundary (IB) method solves fluid-structure interactions on fixed Cartesian grids, making it a powerful tool for problems with complex structural geometries and kinematics (Peskin 1972;Kim et al 2003;Mittal & Iaccarino 2005;Sotiropoulos & Yang 2014;Tschisgale, Kempe & Fröhlich 2017a;Calderer et al 2018;Kim & Choi 2019;Huang & Tian 2019;Monti et al 2020;Sharma & García-Mayoral 2020a;He et al 2022;Zeng, Bhalla & Shen 2022). Hence, by resolving the stems in the canopy with the IB method, the drag on the stems can be obtained directly; i.e.…”

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confidence: 99%

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Simulation-based study of turbulent aquatic canopy flows with flexible stems

Liu

Shen

2022

J. Fluid Mech.

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Large-eddy simulation (LES) is performed to investigate the dynamics of flow and canopy motions and the energy transfer in turbulent canopy flows. Different from the traditional approach that models the canopy as a continuous medium with a drag coefficient prescribed a priori, an immersed boundary method together with a beam model is employed to explicitly capture the dynamics of individual stems and resolve monami. The simulation cases cover a broad range of stem flexibilities from rigid stems to oscillatory stems to stems yielding to the flow. For highly flexible canopies, the stem fluctuation is small such that the canopy behaves like a rigid canopy, which is used to explain the similarities of the flow features between rigid and highly flexible canopies. Analyses of the turbulent kinetic energy (TKE) budget show that, in the flexible canopy cases, the waving term associated with the canopy drag–flow velocity correlation can be as large as one-half of the shear production term near the canopy top. Spectral TKE budget analyses further reveal dominant effects at two characteristic scales: the monami scale associated with the coherent structures in the mixing layer and the wake scale associated with the interval between adjacent stems. For the TKE in flexible canopies, the waving term is found to play an important role in the interscale and wall-normal transport terms. Our LES data show that the spectral shortcut mechanism proposed by previous studies is caused by the waving term.

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