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首页> 外文期刊>International journal of computational fluid dynamics >Flows around moving bodies using a dynamic unstructured overset-grid method
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Flows around moving bodies using a dynamic unstructured overset-grid method

机译：使用动态非结构化重叠网格方法在运动物体周围流动

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摘要

In this article, a computational fluid dynamics algorithm is presented for simulations of complex unsteady flows around rigid moving bodies using an unstructured overset-grid method. For this purpose, a highly automated, three-dimensional, tetrahedral, unstructured overset-grid method is developed with one-cell-width overlapping zone in order to model the arbitrary geometries for steady and unsteady flow simulations. A method has been described to obtain the inter-grid boundaries of the one-cell-wide overlapping zone shared by a background grid and a minor grid. In the overset-grid methodology, vector intersection algorithm and bounding box techniques have been utilised. The mesh refinement and overset-scheme conservation studies proved the accuracy and efficiency of the method developed here. The applications of the developed algorithms were also performed through simulations that included complex internal flows around a flow-control butterfly valve as well as flows in an internal combustion engine with a moving piston. Lastly, validations with experimental data were conducted for both steady and unsteady flows around rigid bodies with relative motions.
机译：在本文中，提出了一种计算流体动力学算法，该算法使用非结构化的覆盖网格方法来模拟刚性运动物体周围的复杂非定常流动。为此，开发了一种高度自动化的，三维，四面体，非结构化的覆盖网格方法，该方法具有一个单元宽度的重叠区域，以便为稳定和不稳定的流动模拟建模任意几何形状。已经描述了一种获得由背景网格和次网格共享的单细胞范围重叠区域的网格间边界的方法。在覆盖网格方法中，已经利用了矢量相交算法和包围盒技术。网格细化和过冲方案守恒研究证明了本文开发的方法的准确性和效率。所开发算法的应用也通过模拟进行，这些模拟包括流量控制蝶阀周围的复杂内部流以及带有活动活塞的内燃机中的流。最后，通过实验数据对刚体周围相对运动的稳态和非稳态流动进行了验证。

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