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Wall-Modeled Large Eddy Simulation of an Aircraft in Landing Configuration

机译:墙面模型的陆地涡流模拟着陆配置

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Wall-Modeled Large Eddy Simulations (WMLES) are carried out for a realistic aircraft model in landing configuration. The validation case considered is that of the Japanese Aerospace Exploration Agency (JAXA) Standard Model (JSM), which was the focus of the recent Third AIAA High-Lift Prediction Workshop (AIAA HLPW-3). The CharLES solver with Voronoi gridding technology developed at Cascade Technologies is leveraged for the current study. An Equilibrium Wall-Modeling (EQWM) approach which assumes that the sum of the turbulent and viscous stresses between the wall and the wall-model/LES exchange location is invariant is employed. The exchange location is at the first cell centroid and no time filtering of the LES input to the wall model is applied. Two JSM configurations are simulated, one with a nacelle/pylon and one without. Good agreement with experimental C_L data is obtained across the flight envelope for both cases at similar computational cost to some Reynolds-Averaged Naver Stokes (RANS) calculations of the same configuration, indicating that WMLES technology is ready for routine use in industry. The coefficient of lift at maximum lift, C_(L,tmax), is predicted to within 5 lift counts, or ≈ 1.5%, of the uncorrected experimental value for both nacelle/pylon on and off configurations. Evaluation of sectional pressures at a post-stall α corroborates the accuracy of the lift predictions. The grids required to achieve this agreement number less than SO million control volumes (Mcv) and include the wind tunnel geometry. For the nacelle/pylon off case, the effect of the tunnel mounting system on the prediction of quantities of interest (QOI's) is evaluated. WMLES shows that it can identify wind tunnel effects, including the appearance of an inboard separation at the wing/body junction absent in many free air calculations of the same configuration.
机译:壁图式的大型涡流模拟(WMLES)在着陆配置中进行了一个现实的飞机模型进行。验证案例认为是日本航空航天勘探机构(JAXA)标准模型(JSM),这是近期第三届AIAA高升力预测研讨会(AIAA HLPW-3)的重点。 Charles求解器与级联技术开发的Voronoi Gridding技术进行了利用,用于目前的研究。采用平衡壁式建模(EQWM)方法,假设墙壁和壁式/ LES交换位置之间的湍流和粘性应力的总和是不变的。交换位置位于第一个细胞质心,并且应用了输入到墙模型的LES的时间过滤。模拟了两个JSM配置,一个带有机舱/塔的一个,一个没有。与实验C_L数据的良好协议在飞行包络中获得了类似的计算成本,对某些雷诺平均的Naver Stokes(RANS)计算相同配置,表明WMLES技术已准备好用于行业的常规用途。最大提升的升力系数C_(L,Tmax)预测到在5升升力中,或≈1.5%,为机舱/塔的未校正实验值的配置和关闭配置。在后退后α的截面压力评估证实了提升预测的精度。所需的网格达到百万百万控制体积(MCV),并包括风洞几何形状。对于壳体的机舱/塔架,评估隧道安装系统对感兴趣量(Qoi)预测的影响。 WMLES表明它可以识别风洞效应,包括在相同配置的许多自由空气计算中缺乏机翼/体结处的内侧分离的外观。

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