A Mollified Sharp-Interface Direct Forcing Method for Suppressing Spurious Oscillations in Moving Immersed Body Simulations

IF 1.7 4区工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

International Journal for Numerical Methods in Fluids Pub Date : 2025-02-12 DOI:10.1002/fld.5382

Pengcheng Liu, Zhihua Xie, Xun Han, Pengzhi Lin

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Abstract

The effects of complex boundary conditions on flows are represented by a volume force in the direct forcing method. This representation introduces spurious oscillations of the volume force in moving immersed body simulations. The present study focuses on the issues of spurious oscillations including pressure and force in the direct forcing method when encountering moving immersed body problems. In this study, the sources of the spurious pressure oscillations in the Cartesian fractional step framework are firstly analyzed theoretically, and then a novel smoothing method for the sharp-interface direct forcing method is proposed, which could significantly suppress the spurious oscillations of the volume force and consequently the pressure field for simulating moving immersed body flow problems. Several canonical moving body flow cases are simulated as benchmarks to demonstrate the advantages of the present method for suppressing spurious pressure oscillations, while the results match remarkably well with previous experiments and numerical studies.

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一种抑制运动沉体仿真中杂散振荡的柔化锐界面直接强迫方法

在直接强迫法中，复杂边界条件对流动的影响用体积力表示。这种表示在运动沉体模拟中引入了体积力的伪振荡。研究了直接强迫法在遇到运动沉体问题时的压力和力伪振荡问题。本文首先从理论上分析了笛卡尔分数阶框架下的假压力振荡的来源，然后提出了一种新的平滑方法用于锐界面直接强迫方法，该方法可以显著抑制体积力的假压力振荡，从而抑制运动沉体流问题的压力场。以几个典型的运动体流为基准，进行了数值模拟，验证了该方法在抑制伪压力振荡方面的优势，结果与以往的实验和数值研究结果吻合得很好。

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来源期刊

International Journal for Numerical Methods in Fluids 物理-计算机：跨学科应用

CiteScore

3.70

自引率

5.60%

发文量

111

审稿时长

8 months

期刊介绍： The International Journal for Numerical Methods in Fluids publishes refereed papers describing significant developments in computational methods that are applicable to scientific and engineering problems in fluid mechanics, fluid dynamics, micro and bio fluidics, and fluid-structure interaction. Numerical methods for solving ancillary equations, such as transport and advection and diffusion, are also relevant. The Editors encourage contributions in the areas of multi-physics, multi-disciplinary and multi-scale problems involving fluid subsystems, verification and validation, uncertainty quantification, and model reduction. Numerical examples that illustrate the described methods or their accuracy are in general expected. Discussions of papers already in print are also considered. However, papers dealing strictly with applications of existing methods or dealing with areas of research that are not deemed to be cutting edge by the Editors will not be considered for review. The journal publishes full-length papers, which should normally be less than 25 journal pages in length. Two-part papers are discouraged unless considered necessary by the Editors.