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首页> 外文期刊>Journal of Computational Physics >A direct-forcing embedded-boundary method with adaptive mesh refinement for fluid-structure interaction problems
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A direct-forcing embedded-boundary method with adaptive mesh refinement for fluid-structure interaction problems

机译：自适应网格细化的直接强迫嵌入边界方法解决流固耦合问题

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In the present work we developed a structured adaptive mesh refinement (S-AMR) strategy for fluid-structure interaction problems in laminar and turbulent incompressible flows. The computational grid consists of a number of nested grid blocks at different refinement levels. The coarsest grid blocks always cover the entire computational domain, and local refinement is achieved by the bisection of selected blocks in every coordinate direction. The grid topology and data-structure is managed using the Paramesh toolkit. The filtered Navier-Stokes equations for incompressible flow are advanced in time using an explicit second-order projection scheme, where all spatial derivatives are approximated using second-order central differences on a staggered grid. For transitional and turbulent flow regimes the large-eddy simulation (LES) approach is used, where special attention is paid on the discontinuities introduced by the local refinement. For all the fluid-structure interaction problems reported in this study the complete set of equations governing the dynamics of the flow and the structure are simultaneously advanced in time using a predictor-corrector strategy. An embedded-boundary method is utilized to enforce the boundary conditions on a complex moving body which is not aligned with the grid lines. Several examples of increasing complexity are given to demonstrate the robustness and accuracy of the proposed formulation.
机译：在当前的工作中，我们针对层流和湍流不可压缩流中的流体-结构相互作用问题开发了结构化自适应网格细化（S-AMR）策略。计算网格由多个处于不同细化级别的嵌套网格块组成。最粗糙的网格块始终覆盖整个计算域，并且通过在每个坐标方向上将所选块二等分来实现局部细化。网格拓扑和数据结构是使用Paramesh工具包管理的。使用显式的二阶投影方案对经过滤波的不可压缩流的Navier-Stokes方程进行时间扩展，其中所有空间导数均使用交错网格上的二阶中心差来近似。对于过渡和湍流流态，使用大涡模拟（LES）方法，其中要特别注意由局部优化引入的不连续性。对于本研究中报告的所有流体-结构相互作用问题，使用预测器-校正器策略可同时同时推进控制流动和结构动力学的完整方程组。利用嵌入边界方法在不与网格线对齐的复杂运动体上施加边界条件。给出了一些增加复杂度的示例，以证明所提出配方的鲁棒性和准确性。

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