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鉴于网格量关系到大型飞机的数值仿真精度和时效性,对大型运输机低速气动力模拟中的网格问题进行了分析,即对某低速构型CFD(计算流体力学)计算的气动力特性的精确度与网格量及网格分布的相关性进行了简要分析.通过不同网格量下CFD计算结果与试验结果的比较表明:为了得到工程实用的气动力数据,翼身组合体干净构型低速计算需要的网格量的量级在580万及以上,翼身组合体着陆构型低速计算需要的网格量的量级在1 500万以上.
In view of the grid quantity is related to the precision and timeliness of numerical simulation of large aircraft, the problem of grid in low-speed aerodynamic simulation of large transport aircraft is analyzed. That is to say, aerodynamic characteristics of a low-speed CFD (computational fluid dynamics) Accuracy and grid quantity and grid distribution are analyzed briefly.The comparison of CFD results with test results under different grid quantities shows that in order to obtain engineering practical aerodynamic data, the clean configuration of wing body assembly The amount of grid required for low-speed calculations is in the order of 5.8 million and above, and the amount of grid required for low-speed calculations of the wing-body combination landing configuration is above 15 million.