新型重叠网格洞面优化方法及其应用

发布时间：2018-06-30 16:59

本文选题：计算流体力学 + 重叠网格　；参考：《航空学报》2016年03期

【摘要】：高度自动化的洞面优化方法是重叠网格关键技术之一。通过对割补法的分析,针对其洞面切割后洞边界位置不确定性及不可预知性问题,提出将其与物面距离优化准则相结合的新型混合洞面优化方法。该方法针对各物体间体网格,采用物面距离优化准则,将洞边界位置控制在物体中间的位置,使重叠区域更合理、可预测;针对背景网格,将其物面距离设置为较大值,采用物面距离优化准则将其落入物体网格内部的单元一并挖去;针对物面处重叠的网格,采用割补法对其进行切割和填补,保证物面及近壁面网格得以有效的重叠。该方法在保证高适用性的前提下提高了网格重叠质量,自动化程度高,无需人工干预。3个典型复杂流动算例计算结果与实验结果吻合良好,网格重叠区域流场变量传递正确,等值线过渡光滑,流场刻画准确,证明该方法准确可靠。
[Abstract]:The highly automated method of hole surface optimization is one of the key technologies of overlapping mesh. Based on the analysis of the cutting and complement method, a new mixed cavity surface optimization method is proposed, which combines the uncertainty and unpredictability of the hole boundary position after the hole surface cutting with the object surface distance optimization criterion. In this method, the boundary position of the hole is controlled in the middle of the object by using the optimization criterion of the distance between the objects, which makes the overlapping area more reasonable and predictable, and the distance of the object surface is set to a larger value for the background grid. The object surface distance optimization criterion is used to dig out the elements which fall into the mesh of the object, and the cutting and filling method is used to cut and fill the overlapping mesh in the object surface to ensure the effective overlap between the object surface and the near wall mesh. On the premise of high applicability, the method improves the quality of mesh overlap, has high degree of automation and does not require manual intervention. The results of three typical complex flow examples are in good agreement with the experimental results, and the flow field variables in the overlapping area of the grid are transferred correctly. The method is proved to be accurate and reliable because of the smooth transition of the isoline and the accurate description of the flow field.
【作者单位】：北京航空航天大学航空科学与工程学院;中国科学院超级计算中心;
【分类号】：O35

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