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首页> 外文期刊>Journal of Computational Physics >A parallelized hybrid N-S/DSMC-IP approach based on adaptive structured/unstructured overlapping grids for hypersonic transitional flows
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A parallelized hybrid N-S/DSMC-IP approach based on adaptive structured/unstructured overlapping grids for hypersonic transitional flows

机译：一种基于自适应结构/非结构化重叠网格的平行化混合N-S / DSMC-IP方法，用于过度过渡流程

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摘要

A new hybrid N-S/DSMC-IP approach based on adaptive structured/unstructured overlap- ping grids is proposed and implemented to simulate hypersonic transitional flows. This approach uses the N-S method based on structured grids and the DSMC-IP method based on unstructured grids in the simulation of continuum and rarefied flow fields. The adaptive overlapping grid method is utilized and the interface between the continuum and rarefied regions is partitioned using Kn(GL) number. The information in the different regions is strongly coupled to the continuum/rarefied interface, and the values in the coupling cells are interpolated with the weight coefficients. Finally, an adaptive parallel strategy is proposed to further improve computational efficiency. This hybrid approach combines the advantages of the structured grid and unstructured grid methods, meaning it can investigate the various characteristics of transitional flow fields with high efficiency and accuracy, while also enhancing the approach's fitness. This hybrid approach is implemented to simulate the continuum/rarefied hypersonic transitional flows around a cylinder and a nozzle; with the results indicating that the computational speed for this hybrid approach is much higher than for the DSMC-IP method and that it can be used to investigate variation in the characteristics of continuum/rarefied regions in transitional flows. Therefore, it is an efficient algorithm for the investigation of hypersonic transitional flows. (C) 2018 Elsevier Inc. All rights reserved.
机译：提出了一种基于自适应结构/非结构化重叠网格的新的混合N-S / DSMC-IP方法，并实施以模拟超声波过渡流程。该方法使用基于结构化网格的N-S方法和基于非结构化网格的DSMC-IP方法在仿真中的连续素和稀薄流动场的模拟中。利用自适应重叠的网格方法，并且使用KN（GL）数来分区连续体和稀土区域之间的界面。不同区域中的信息强烈地耦合到连续内/稀释界面，并且耦合单元中的值与重量系数内插。最后，提出了一种自适应并行策略，以进一步提高计算效率。这种混合方法结合了结构化电网和非结构化网格方法的优点，这意味着它可以高效率和准确性研究过渡流场的各种特性，同时增强了这种方法的健身。实施这种混合方法以模拟圆柱体和喷嘴周围的连续内/稀土过度过渡流动;结果表明，该混合方法的计算速度远高于DSMC-IP方法，并且它可用于研究过渡流程中连续/稀土区域特征的变化。因此，它是一种高效转型流动研究的有效算法。 （c）2018年Elsevier Inc.保留所有权利。

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