海洋CFD代码在非牛顿流体基准问题中的应用:球体周围的流动

IF 0.6 Q4 ENGINEERING, MARINE
Stefano Lovato, S. Toxopeus, J. Settels, G. Keetels
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引用次数: 0

摘要

港口和水道海床上存在的流体泥层可能会对船舶在浅水中的阻力和机动性产生不利影响。流体泥浆表现出复杂的非牛顿流变学,通常使用Herschel–Bulkley模型进行描述。后者最近已在海事有限体积CFD代码中实现,以研究船舶在泥泞海床中的机动性。在本文中,我们探讨了CFD代码在模拟Herschel–Bulkley流体流动时的准确性和稳健性,包括幂律、宾厄姆和牛顿流体作为特殊情况。作为最终海事应用的垫脚石,这项研究是针对非牛顿流体力学中的一个经典基准问题进行的:球体周围的层流。其目的是在将非牛顿解算器应用于更复杂的场景之前测试其性能。目前的结果也可以作为未来测试的参考数据。为了将我们的结果与文献中广泛收集的数据进行比较,在低雷诺数下进行了流动模拟。结果在定性和定量上均与文献一致。在模拟Bingham和Herschel–Bulkley流时,迭代求解器的收敛性出现了困难。表观粘度插值的简单改变减轻了这种困难。这项工作的结果,结合我们之前的代码验证练习,表明非牛顿求解器按预期工作,因此可以用于更复杂的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of a maritime CFD code to a benchmark problem for non-Newtonian fluids: the flow around a sphere
The ship’s resistance and manoeuvrability in shallow waters can be adversely influenced by the presence of fluid mud layers on the seabed of ports and waterways. Fluid mud exhibits a complex non-Newtonian rheology that is often described using the Herschel–Bulkley model. The latter has been recently implemented in a maritime finite-volume CFD code to study the manoeuvrability of ships in the presence of muddy seabeds. In this paper, we explore the accuracy and robustness of the CFD code in simulating the flow of Herschel–Bulkley fluids, including power-law, Bingham and Newtonian fluids as particular cases. As a stepping stone towards the final maritime applications, the study is carried out on a classic benchmark problem in non-Newtonian fluid mechanics: the laminar flow around a sphere. The aim is to test the performance of the non-Newtonian solver before applying it to the more complex scenarios. Present results could also be used as reference data for future testing. Flow simulations are carried out at low Reynolds numbers in order to compare our results with an extensive collection of data from the literature. Results agree both qualitatively and quantitatively with literature. Difficulties in the convergence of the iterative solver emerged when simulating Bingham and Herschel–Bulkley flows. A simple change in the interpolation of the apparent viscosity has mitigated such difficulties. The results of this work, combined with our previous code verification exercises, suggest that the non-Newtonian solver works as intended and it can be thus employed on more complex applications.
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来源期刊
CiteScore
2.60
自引率
0.00%
发文量
8
期刊介绍: The journal International Shipbuilding Progress was founded in 1954. Each year four issues appear (in April, July, September and December). Publications submitted to ISP should describe scientific work of high international standards, advancing subjects related to the field of Marine Technology, such as: conceptual design structural design hydromechanics and dynamics maritime engineering production of all types of ships production of all other objects intended for marine use shipping science and all directly related subjects offshore engineering in relation to the marine environment ocean engineering subjects in relation to the marine environment
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