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

机译:第三高升力预测车间(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应用于NASA的常见研究模型(HL-CRM)的高升程版本,以及JAXA标准模型(JSM),用于3〜(RD)AIAA CFD高升力预测车间。在HL-CRM的完全堵塞和部分密封的变体上产生适应的网状溶液和JSM的机舱和截止变化。网格适应由尺寸的度量驱动,最小化解决方案Hessian的L_P插值误差,对于给定数量的自由度。还呈现了一些使用基于输出的错误指示符的自适应解决方案。使用有限元流求解器来计算流量解决方案,该有限元流求解器实现了溶液残留的机器水平收敛。在HL-CRM模型上,自适应网格结果以完全堵塞和部分密封的几何变形的两个角度计算。在自适应结果和结果对固定网状物系列之间比较网格融合。与固定网格相比,发现改进的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,并演示显着改善的网格融合属性。在JAXA JSM模型上,计算自适应网格结果以实现攻击扫描角度,并与固定网格结果进行比较。发现自适应网格结果与下面的试验数据提供更好的协议。发现固定和自适应网格结果都在测试数据中测量的临界攻角下降1至2度。

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