面向大型飞机流场模拟的网格需求探讨

Mesh requirements for the large transport aircraft flow field simulation

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.

Mesh size is important for numerical simulation accuracy and calculate time of large transport aircraft.In this paper,the order of magnitude mesh size requirements for the large transport aircraft low speed dynamics flow field CFD(computational fluid dynamics)simulation were discussed.The relationship among the aerodynamic results′ accuracy,the mesh size and the mesh distribution was analyzed.By comparing the CFD results of different mesh sizes with the test data,we can draw a conclusion: to make the CFD results practicable in engineering,the required mesh size for clean wing-body configuration should be more than 5.8 million;and for the landing configuration with complicated high-lift devices,the mesh size should be at least more than 15 million.