A Lattice Boltzmann method for free surface flows over partially submerged structures

IF 3.4 2区物理与天体物理 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computer Physics Communications Pub Date : 2025-09-04 DOI:10.1016/j.cpc.2025.109852

Baoming Guo , Jianping Meng , Zhihua Xie , Dezhi Ning , Shunqi Pan

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引用次数: 0

Abstract

The Lattice Boltzmann method (LBM) has been extensively developed to efficiently simulate free surface flows and interactions between single-phase flows and fully immersed structures. However, few studies have focused on modelling partially submerged structures, particularly on accurately evaluating their hydrodynamic forces under gravity and wave dynamic conditions. To advance the application of LBM in this area, this study presents a dynamic-pressure Lattice Boltzmann model tailored for simulating partially submerged stationary structures in free surface flows. In the free surface section, the volume-of-fluid method is implemented and the advection of volume fraction is governed by the streaming of intrinsic density distribution functions. For the fluid-structure interface, an interpolated bounce-back scheme is imposed on the no-slip fluid-structure boundary and an improved momentum exchange method is employed to assess the fluid loads, accounting for the effects of gravity and external sources. This paper details the implementation of modelling framework and presents the outcomes of five benchmark simulations conducted for model verification and validation. These cases include flows over a circular cylinder and a square cylinder, Rider-Kothe single vortex evolution, dam-break flows, and wave impact on two partially submerged fixed boxes. The developed numerical model yields satisfactory agreement with experimental and numerical results in terms of the hydrodynamic force evaluation and free surface deformation. The final case demonstrates the capability of the LBM model in investigating frequency response of wave impact on partially submerged structures, highlighting its potential for broader applications in coastal and ocean engineering.

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部分淹没结构自由表面流动的晶格玻尔兹曼方法

晶格玻尔兹曼方法（Lattice Boltzmann method， LBM）得到了广泛的发展，以有效地模拟自由表面流动以及单相流动与全浸入式结构之间的相互作用。然而，很少有研究关注部分淹没结构的建模，特别是在重力和波浪动力条件下准确评估其水动力。为了推进LBM在这一领域的应用，本研究提出了一种针对自由表面流动中部分淹没固定结构的动态压力晶格玻尔兹曼模型。在自由截面上，采用流体体积法，体积分数的平流由本征密度分布函数的流动控制。对于流固界面，在无滑移流固边界上施加内插式反弹格式，并采用改进的动量交换法评估流体载荷，同时考虑重力和外部源的影响。本文详细介绍了建模框架的实现，并给出了为模型验证和验证而进行的五个基准模拟的结果。这些情况包括圆柱和方圆柱上的流动，Rider-Kothe单涡演变，溃坝流动以及波浪对两个部分淹没的固定箱的影响。所建立的数值模型在水动力评估和自由表面变形方面与实验和数值结果吻合较好。最后一个案例证明了LBM模型在研究波浪对部分淹没结构的频率响应方面的能力，突出了它在沿海和海洋工程中更广泛应用的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computer Physics Communications 物理-计算机：跨学科应用

CiteScore

12.10

自引率

3.20%

发文量

287

审稿时长

5.3 months

期刊介绍： The focus of CPC is on contemporary computational methods and techniques and their implementation, the effectiveness of which will normally be evidenced by the author(s) within the context of a substantive problem in physics. Within this setting CPC publishes two types of paper. Computer Programs in Physics (CPiP) These papers describe significant computer programs to be archived in the CPC Program Library which is held in the Mendeley Data repository. The submitted software must be covered by an approved open source licence. Papers and associated computer programs that address a problem of contemporary interest in physics that cannot be solved by current software are particularly encouraged. Computational Physics Papers (CP) These are research papers in, but are not limited to, the following themes across computational physics and related disciplines. mathematical and numerical methods and algorithms; computational models including those associated with the design, control and analysis of experiments; and algebraic computation. Each will normally include software implementation and performance details. The software implementation should, ideally, be available via GitHub, Zenodo or an institutional repository.In addition, research papers on the impact of advanced computer architecture and special purpose computers on computing in the physical sciences and software topics related to, and of importance in, the physical sciences may be considered.