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Anisotropic Adaptive Mesh Results for the Third High Lift Prediction Workshop (HiLiftPW-3)

机译:第三届高升程预测研讨会(HiLiftPW-3)的各向异性自适应网格结果

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An anisotropic adaptive mesh generation technique is applied to the high-lift version of NASA's Common Research Model (HL-CRM) and to the JAXA Standard Model (JSM) for use with the 3~(rd) AIAA CFD High Lift Prediction Workshop. Adapted mesh solutions are generated on fully gapped and partially sealed variants of the HL-CRM and nacelle on and off variations of the JSM. Mesh adaptation is driven by a sizing metric that minimizes the L_p interpolation error of the solution Hessian for a given number of degrees of freedom. A few adaptive solutions using an output-based error indicator are also presented. Flow solutions are computed using a finite-element flow solver that achieves machine level convergence of the solution residuals. On the HL-CRM model adaptive mesh results are computed at two angles of attack on fully gapped and partially sealed variations of the geometry. Mesh convergence is compared between the adaptive results and results on a family of fixed meshes. In comparison to the fixed meshes, adapted meshes are found to better resolve important flow field features using fewer mesh elements and demonstrate markedly improved mesh convergence properties. On the JAXA JSM model, adaptive mesh results are computed for an angle of attack sweep and compared with fixed mesh results. The adaptive mesh results are found to provide better agreement with test data below stall. Both the fixed and adaptive mesh results are found to stall 1 to 2 degrees below the critical angle of attack measured in the test data.
机译:各向异性自适应网格生成技术已应用于美国国家航空航天局通用研究模型(HL-CRM)的高升程版本和与第3届AIAA CFD高升程预测研讨会一起使用的JAXA标准模型(JSM)。在HL-CRM的完全间隙和部分密封的变体以及JSM的开/关机舱上生成适应的网格解决方案。在给定的自由度数下,网格调整是由尺寸调整度量驱动的,该度量最小化了解决方案Hessian的L_p内插误差。还介绍了一些使用基于输出的错误指示器的自适应解决方案。使用有限元流解算器计算流解,该解算器实现了解决方案残差的机器级收敛。在HL-CRM模型上,在几何的完全间隙和部分密封的变化的两个攻角下计算自适应网格结果。在自适应结果和一系列固定网格的结果之间比较网格收敛。与固定网格相比,发现自适应网格可以使用更少的网格元素更好地解决重要的流场特征,并显示出明显改善的网格收敛特性。在JAXA JSM模型上,针对攻角扫描计算自适应网格结果,并将其与固定网格结果进行比较。发现自适应网格结果与失速以下的测试数据提供了更好的一致性。发现固定和自适应网格结果都在测试数据中测得的临界攻角以下失速了1至2度。

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