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arXiv 2006.02497physics.comp-phphysics.app-ph
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复杂几何形状中热和流体输运有效模拟的多尺度多孔分辨方法及其在电功率Transformers中的应用

A multiscale porous--resolved methodology for efficient simulation of heat and fluid transport in complex geometries, with application to electric power transformers

Ole H. H. Meyer, Karl Yngve Lervåg, Åsmund Ervik

摘要:

流体在复杂几何结构中的流动与传热的数值模拟对于许多应用(例如充油电力Transformers)具有强烈的兴趣。这里的一个基本挑战是,高分辨率是必要的,以解决流体流动现象,但这使得模拟的完整的几何形状非常昂贵的计算能力。在这项工作中,我们开发了一种模拟方法,结合多孔介质的方法来模拟某些区域的域,再加上完全解决的模拟在这些地区被认为是最有趣的详细研究。由于在用多孔方法建模的区域中不能解析诸如热边界层的流动特征,因此这些部分中的分辨率可以是数量级更粗糙的。这种多尺度的方法验证对使用完全解决的模拟在整个域中,以及对扩展Graetz问题的解析解。然后,我们将该方法应用于大型电功率Transformers中的油流和传热的研究,并证明了一个完全解决的方法相比,计算成本显着降低。

英文摘要:

The numerical simulation of fluid flow through a complex geometry with heat transfer is of strong interest for many applications, such as oil-filled power transformers. A fundamental challenge here is that high resolution is necessary to resolve the fluid flow phenomena, but this makes simulation of the full geometry very expensive in terms of computational power. In this work, we develop a simulation methodology that combines a porous-medium approach for simulating some regions of the domain, coupled with fully resolved simulations in those regions which are deemed most interesting to study in detail. As one does not resolve flow features like thermal boundary layers in the regions modeled with the porous approach, the resolution in these parts can be orders of magnitude coarser. This multiscale approach is validated against the use of fully resolved simulations in the whole domain, as well as against analytical solutions to the extended Graetz problem. We then apply the approach to the study of oil flow and heat transfer in large electric power transformers and demonstrate a significant reduction in computational cost compared to a fully resolved approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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